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Tyler Coplen

Director, Reston Stable Isotope Laboratory

Contact Info


Short Biography

B.S. (Physics), Pacific Lutheran Univ. (1961-1966)        

M.S. (Geophysical Sciences/Geochemistry), Univ. of Chicago (1966-1968)  

Ph.D. (Geophysical Sciences/Geochemistry), Univ. of Chicago (1968-1970) 

Assistant Research Geochemist, University of California, Riverside (1970-1974)

Leader of the project titled Physical Chemistry of Stable Isotope Fractionation in Hydrologic Processes since 1974.

 

Head of the Reston Stable Isotope Laboratory since 1978 (see http://isotopes.usgs.gov/ ).

                    



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Publications

Leonard I. Wassenaar, Tyler B. Coplen, and Pradeep K. Aggarwal, 2014, Approaches for Achieving Long-Term Accuracy and Precision of δ18O and δ2H for Waters Analyzed using Laser Absorption Spectrometers: Environ. Sci. Technol., v. 48(2), pp 1123–1131, DOI: 10.1021/es403354n [Link]

Haiping Qi, Jennifer M. Lorenz, Tyler B. Coplen, Lauren Tarbox, Bernhard Mayer, and Steve Taylor, 2014, Lake Louise Water (USGS47): A new isotopic reference water for stable hydrogen and oxygen isotope measurements: Rapid Communications in Mass Spectrometry, v. 28(4), pg. 351-354. DOI: 10.1002/rcm.6789 [Link]

Haiping Qi, Tyler B. Coplen, Lauren Tarbox, Jennifer M. Lorenz, and Martha Scholl, 2014, USGS48 Puerto Rico precipitation - a new isotopic reference material for δ2H and δ18O measurements of water: Isotopes in Environmental & Health, v. 50(3), pg. 1-6. DOI: 10.1080/10256016.2014.905555

Brand, W., Coplen, T. B., Vogl, J., Rosner, M., & Prohaska, T., 2014, Assessment of International Reference Materials for Stable Isotope Ratio Analysis 2013: Pure and Applied Chemistry, v. 86(3), pp. 425-467. DOI:10.1515/pac-2013-1023. [Link]

Lorenz, Jennifer, Tarbox, Lauren, Buck, Bryan, Qi, Haiping, and Coplen, Tyler B., 2014, Biscayne aquifer drinking water (USGS45): A new isotopic reference material for δ2H and δ18O measurements of water. Rapid Communications in Mass Spectrometry, v. 28, in press. DOI: 10.1002/rcm.6988

Kim, Sang-Tae, Gebbinck, Christa Klein, Mucci, Alfonso, and Coplen, Tyler B., 2014, Oxygen isotope systematics in the aragonite–CO2–H2O–NaCl system up to 0.7 mol/kg ionic strength at 25 °C. Geochimica et Cosmochimica Acta, v. 137, p. 147–158.

Qi, Haiping, Coplen, Tyler B., Olack, Gerard A., and Vennemann, Torsten W., 2014, Caution on the use of NBS 30 biotite for hydrogen-isotope measurements with on-line high-temperature conversion systems. Rapid Communications in Mass Spectrometry, v. 28, p. 1987–1994. DOI: 10.1002/rcm.6983

Landwehr, J.M., Coplen, T.B., and Stewart, D.W., 2013, Spatial, seasonal, and source variability in the stable oxygen and hydrogen isotopic composition of tap waters throughout the United States: Hydrological Processes, accepted article, 55 p., DOI:10.1002/hyp.10004. [Link]

Coplen, T. B., Brand, W. A., Meija, J., Gröning, M., Holden, N.E., Berglund, M., De Bièvre, P., Loss, R. D., Prohaska, T., Walczyk, T., 2013, Atomic weights of the elements 2013 (xls), Commission on Isotopic Abundances and Atomic Weights, available only online at http://www.ciaaw.org/pubs/TSAW2013_xls.xls [Link]

Coplen, T.B., Landwehr, J.M., Qi, Haiping, and Lorenz, J.M., 2013, The δ2H and δ18O of tap water from 349 sites in the United States and selected territories: U.S. Geological Survey Data Series 703, 113 p. [Link]

Wieser, M.E., Holden, N., Coplen, T.B., Böhlke, J.K., Berglund, M. , Brand, W.A., De Bièvre, P., Gröning, M., Loss, R.D., Meija, J., Hirata, T., Prohaska, T., Schönberg, R., Singleton, G., Walczyk, T., Yoneda, S., and Zhu, X., 2013, Atomic weights of the elements 2011: Pure and Applied Chemistry, v. 85(5), p. 1047-1078. [Link]

Tyler B. Coplen, Haiping Qi, Lauren Tarbox, Jennifer Lorenz, and Bryan Buck, 2013, USGS46 Greenland Ice Core Water—A New Isotopic Reference Material for d2H and d18O Measurements of Water: Geostandards and Geoanalytical Research. DOI: 10.1111/j.1751-908X.2013.00267.x [Link]

Tyler B. Coplen and Haiping Qi, 2013, Recognizing the potential pitfalls of hydrogen isotopic analysis of keratins with steam equilibration to infer origins of wildlife, food, and people: Rapid Communications in Mass Spectrometry, v. 27(22), page 2569, Article first published online: 7 OCT 2013, DOI: 10.1002/rcm.6715 [Link]

Norman E. Holden and Tyler B. Coplen, 2013, ConfChem Conference on A Virtual Colloquium to Sustain and Celebrate IYC 2011 Initiatives in Global Chemical Education: The IUPAC Periodic Table of Isotopes for the Educational Community, J. Chem. Educ., v. 90(11), pp 1550–1551, DOI: 10.1021/ed3008236 [Link]

Ward E. Sanford, Michael W. Doughten, Tyler B. Coplen, Andrew G. Hunt & Thomas D. Bullen, 2013, Evidence for high salinity of Early Cretaceous sea water from the Chesapeake Bay crater: Nature, v. 503, pp. 252–256, DOI:10.1038/nature12714 [Link]

Coplen, T. B., and Qi, H., 2012, USGS42 and USGS43: Human-hair stable hydrogen and oxygen isotopic reference materials and analytical methods for forensic science and implications for published measurement results: Forensic Science International, v. 214, p. 135-141. [Link]

Coplen, T.B., Qi, Haiping, Révész, Kinga, Casciotti, Karen, and Hannon, J.E., 2012, Determination of the δ15N of nitrate in solids; RSIL lab code 2894, chap. 12 of Stable isotope-ratio methods, sec. C of Révész, Kinga, and Coplen, T.B. eds., Methods of the Reston Stable Isotope Laboratory (slightly revised from version 1.0 released in 2006): U.S. Geological Survey Techniques and Methods, book 10, 35 p., available only online. [Link]

Coplen, T.B., Qi, Haiping, Révész, Kinga, Casciotti, Karen, Hannon, J.E., 2012, Determination of the δ15N and δ18O of nitrate in solids; RSIL lab code 2897, chap. 14 of Stable isotope-ratio methods, sec. C of Révész, Kinga, and Coplen, T.B. eds., Methods of the Reston Stable Isotope Laboratory (slightly revised from version 1.0 released in 2006): U.S. Geological Survey Techniques and Methods, book 10, 36 p., available only online. [Link]

Coplen, T.B., Qi, Haiping, Révész, Kinga, Casciotti, Karen, and Hannon, J.E., 2012, Determination of the δ15N of nitrate in water; RSIL lab code 2899, chap. 16 of Stable isotope-ratio methods, sec. C of Révész, Kinga, and Coplen, T.B. eds., Methods of the Reston Stable Isotope Laboratory (slightly revised from version 1.0 released in 2006): U.S. Geological Survey Techniques and Methods, book 10, 35 p., available only online. [Link]

Coplen, T.B., Qi, Haiping, Révész, Kinga, Casciotti, Karen, and Hannon, J.E., 2012, Determination of the δ15N and δ18O of nitrate in water; RSIL lab code 2900, chap. 17 of Stable isotope-ratio methods, sec. C of Révész, Kinga, and Coplen, T.B. eds., Methods of the Reston Stable Isotope Laboratory (slightly revised from version 1.0 released in 2006): U.S. Geological Survey Techniques and Methods, book 10, 35 p., available online. [Link]

Révész, K., Buck, B., and Coplen, T. B., 2012, Determination of the δ2H and δ18O of soil water and plant matter; RSIL lab code1700, chap. 19 of Stable isotope-ratio methods, sec. C of Révész, Kinga, and Coplen, T.B., eds., Methods of the Reston Stable Isotope Laboratory: U.S. Geological Survey Techniques and Methods, book 10, 21 p., available only online. [Link]

Révész, Kinga, Qi, Haiping, and Coplen, T.B., 2012, Determination of the δ34S of total sulfur in solids; RSIL lab code 1800, chap. 18 of Stable isotope-ratio methods, sec. C of Révész, Kinga, and Coplen, T.B. eds., Methods of the Reston Stable Isotope Laboratory (slightly revised from version 1.1 released in 2007): U.S. Geological Survey Techniques and Methods, book 10, 31 p., available only online. [Link]

Révész, Kinga, Qi, Haiping, and Coplen, T.B., 2012, Determination of the δ15N and δ13C of total nitrogen and carbon in solids; RSIL lab code 1832, chap. 5 of Stable isotope-ratio methods, sec. C of Révész, Kinga, and Coplen, T.B. eds., Methods of the Reston Stable Isotope Laboratory (slightly revised from version 1.1 released in 2007): U.S. Geological Survey Techniques and Methods, book 10, 31 p., available only online. [Link]

Révész, Kinga, Qi, Haiping, and Coplen, T.B., 2012, Determination of the δ34S of low-concentration sulfate in water; RSIL lab code 1949, chap. 8 of Stable isotope-ratio methods, sec. C of Révész, Kinga, and Coplen, T.B. eds., Methods of the Reston Stable Isotope Laboratory (slightly revised from version 1.1 released in 2007): U.S. Geological Survey Techniques and Methods, book 10, 35 p., available only online. [Link]

Révész, Kinga, Qi, Haiping, and Coplen, T.B., 2012, Determination of the δ34S of sulfate in water; RSIL lab code 1951, chap. 10 of Stable isotope-ratio methods, sec. C of Révész, Kinga, and Coplen, T.B. eds., Methods of the Reston Stable Isotope Laboratory (slightly revised from version 1.1 released in 2007): U.S. Geological Survey Techniques and Methods, book 10, 33 p., available only online. [Link]

Révész, Kinga, Qi, Haiping, and Coplen, T.B., 2012, Determination of the δ15N of total nitrogen in solids; RSIL lab code 2893, chap. 11 of Stable isotope-ratio methods, sec. C of Révész, Kinga, and Coplen, T.B. eds., Methods of the Reston Stable Isotope Laboratory (slightly revised from version 1.1 released in 2007): U.S. Geological Survey Techniques and Methods, book 10, 30 p., available only online. [Link]

Singleton, G.L., Révész, Kinga, Coplen, T.B., 2012, Determination of the δ13C of dissolved inorganic carbon in water; RSIL lab code 1710, chap. 18 of Stable isotope-ratio methods, sec. C of Révész, Kinga, and Coplen, T.B., eds., Methods of the Reston Stable Isotope Laboratory: U.S. Geological Survey Techniques and Methods, book 10, 28 p., available only online. [Link]

Brand, W.A., and Coplen, T.B., 2012, Stable isotope deltas: tiny, yet robust signatures in nature: Isotopes in Environmental and Health Studies, v. 48, n. 3, p. 393-409. [Link]

Coplen, T.B., and Holden, N.E., 2011, Atomic weights - No longer constants of nature: Chemistry International, v. 33, no. 2, p. 10-15. [Link]

Holden, N.E., Coplen, T.B., Böhlke, J.K., Wieser, M.E., Singleton, G., Walczyk, T.R., Yoneda, S., Mahaffy, P.G., and Tarbox, L.V., 2011, IUPAC Periodic Table of the Isotopes: Chemistry International, v. 33, no. 4 Supplement. [Link]

Qi, H., and Coplen, T.B., 2011, Investigation of preparation techniques for δ2H analysis of keratin materials and a proposed analytical protocol: Rapid Communications in Mass Spectrometry, v. 25, no. 15, p. 2209-2222. DOI: 10.1002/rcm.5095 [Link]

Qi, H., and Coplen, T.B., 2011, Erratum for Investigation of preparation techniques for δ2H analysis of keratin materials and a proposed analytical protocol: Rapid Communications in Mass Spectrometry, v. 25, no. 18, p. 2672. DOI: 10.1002/rcm.5186 [Link]

Qi, H., Coplen, T.B., and Wassenaar, L.I., 2011. Improved online δ18O measurements of nitrogen- and sulfur-bearing organic materials and a proposed analytical protocol: Rapid Communications in Mass Spectrometry, v. 25, p. 2049-2058. DOI: 10.1002/rcm.5088 [Link]

Wieser, M.E., and Coplen, T.B., 2011, Atomic weights of the elements 2009 (IUPAC Technical Report): Pure and Applied Chemistry, v. 83,no. 2, p. 359-396. DOI:10.1351/PAC-REP-10-09-14 [Link]

Coplen, T.B., 2011, Guidelines and recommended terms for expression of stable-isotope-ratio and gas-ratio measurement results: Rapid Communications in Mass Spectrometry, v. 25, p. 2538-2560. [Link]

Landwehr, J.M., Sharp, W.D., Coplen, T.B., Ludwig, K.R., and Winograd, I.J., 2011, The chronology for the δ18O record from Devils Hole, Nevada, extended into the Mid-Holocene: U.S. Geological Survey Open-File Report 2011-1082, 5 p. [Download File]

Brand, W.A., Assonov, S.S., and Coplen, T.B., 2010, Correction for the 17O interference in δ(13C) measurements when analyzing CO2 with stable isotope mass spectrometry (IUPAC Technical Report): Pure and Applied Chemistry, v. 82, no. 8, p. 1719-1733. DOI: 10.1351/PAC-REP-09-01-05 [Link]

Coplen, T.B., 2010, Isotopic reference materials, in Beauchemin. D, and Matthews, D.E., eds., Elemental and Isotope Ratio Mass Spectrometry: The Encyclopedia of Mass Spectrometry, Gross, M. L. and Caprioli, R. M., series eds., Oxford, U.K., Elsevier, v. 5, p. 774-783.

Coplen, T.B., 2010, Sequential, time-integrated collector of precipitation, ground water, and surface water for analysis of isotopes: U.S. Patent No. 7,687,028. [Link]

Coplen, T.B. and Qi, H., 2010, Caution on the use of liquid nitrogen traps in stable hydrogen isotope-ratio mass spectrometry: Analytical Chemistry, v. 82, no. 18, p. 7849–7851, DOI: 10.1021/ac101570f. [Link]

Coplen, T.B. and Qi, H., 2010, Applying the silver-tube introduction method for thermal conversion elemental analyses and a new δ2H value for NBS 22 oil: Rapid Communications in Mass Spectrometry, v. 24, no. 15, p. 2269-2276, DOI: 10.1002/rcm.4638. [Link]

Mack, T.J., Akbari, M.A., Ashoor, M.H., Chornack, M.P., Coplen, T.B., Emerson, D.G., Hubbard, B.E., Litke, D.W., Michel, R.L., Plummer, L.N., Rezai, M.T., Senay, G.B., Verdin, J.P., and Verstraeten, I.M., 2010, Conceptual model of water resources in the Kabul Basin, Afghanistan: U.S. Geological Survey Scientific Investigations Report 2009–5262, 240 p. [Link]

Mack, T.J., Chornack, M.P., Coplen, T.B., Plummer L.N., Rezai, M.T., and Verstraeten, I.M., 2010, Availability of Water in the Kabul Basin, Afghanistan. U.S. Geological Survey Fact Sheet, FS 2010-3037, 4 p. [Link]

Qi, H., Gröning, M., Coplen, T.B., Buck, B., Mroczkowski, S.J., Brand, W.A., Geilmann, H., and Gehre, M., 2010, Novel silver-tubing method for quantitative introduction of water into high-temperature conversion systems for stable hydrogen and oxygen isotopic measurements: Rapid Communications in Mass Spectrometry, vol. 24, p. 1821-1827, DOI: 10.1002/rcm.4559. [Link]

Coplen Tyler Benjamin, I I, 2010, United States Patent: 7687028 - Sequential, time-integrated collector of precipitation, ground water, and surface water for analysis of isotopes: The United States of America as represented by the Secretary of the Interior (Washington, DC).

Brand, W. A., Coplen, T. B., Aerts-Bijma, A. T., Böhlke, J. K., Gehre, M., Geilmann, H., Gröning, M., Jansen, H. G., Meijer, H. A. J., Mroczkowski, S. J., Qi, H., Soergel, K., Stuart-Williams, H., Weise, S. M., and Werner, R. A., 2009, Comprehensive inter-laboratory calibration of reference materials for δ18O versus VSMOW using various on-line high-temperature conversion techniques: Rapid Communications in Mass Spectrometry, v. 23, no. 7, p. 999-1019. DOI: 10.1002/rcm.3958 [Link]

Coplen, T.B., and Qi, H., 2009, Quality assurance and quality control in light stable isotope laboratories: A case study of Rio Grande, Texas, water samples. Isotopes in Environmental and Health Studies, v. 45, p. 126–134. [Link]

Scholl, M. A., Shanley, J. B., Zegarra, J. P., and Coplen, T. B., 2009, The stable isotope amount effect: New insights from NEXRAD echo tops, Luquillo Mountains, Puerto Rico. Water Resources Research, v. 45, No. 12, W12407. [Link]

Coplen, T.B., and Qi, H., 2009, Quality assurance and quality control in light stable isotope laboratories: A case study of Rio Grande, Texas, water samples: Isotopes in Environmental and Health Studies, v. 45, p. 126–134. DOI: 10.1080/10256010902871952 [Link]

Coplen, T.B., Neiman, P.J., White, A.B., Landwehr, J.M., Ralph, F.M., and Dettinger, M.D., 2008, Extreme changes in stable hydrogen isotopes and precipitation characteristics in a landfalling Pacific storm: Geophysical Research Letters, v. 35, L21808. DOI: 10.1029/2008GL035481 [Link]

Coplen, T.B., Neiman, P.J., White, A.B., Landwehr, J.M., Ralph, F.M., and Dettinger, M.D., 2008, Extreme changes in stable hydrogen isotopes and precipitation characteristics in a landfalling Pacific storm: Geophysical Research Letters, v. 35, L21808. [Link]

Révész, Kinga, and Coplen, T.B., 2008, Determination of the δ(2H/1H) of water: RSIL lab code 1574, chap. C1 of Révész, Kinga, and Coplen, T.B., eds., Methods of the Reston Stable Isotope Laboratory: U.S. Geological Survey Techniques and Methods 10–C1, 27 p. [Link]

Révész, Kinga, and Coplen, T. B., 2008, Determination of the δ(18O/16O) of Water: RSIL Lab Code 489, in Révész, Kinga, and Coplen, T.B., eds., Methods of the Reston Stable Isotope Laboratory: U.S. Geological Survey Techniques and Methods, book 10, chap. C2, 28 p. [Link]

Coplen, T.B., 2007, Calibration of the calcite–water oxygen-isotope geothermometer at Devils Hole, Nevada, a natural laboratory: Geochimica et Cosmochimica Acta, v. 71, no. 16, p. 3948-3957. DOI:10.1016/j.gca.2007.05.028 [Link]

Coplen, T.B., and Peiser, H.S., 2007, Errata. History of the recommended atomic weight values from 1882 to 1997: A comparison of differences from current values to the estimated uncertainties of earlier values: Pure and Applied Chemistry, v. 79, p. 953. [Link]

Coplen, T.B., Brand, W.A., Gehre, M., Gröning, M., Meijer, H.A.J., Toman, B., and Verkouteren, R.M., 2006, New guidelines for δ13C measurements: Analytical Chemistry, v. 78, p. 2439-2441. DOI: 10.1021/ac052027c [Link]

Coplen, T.B., Brand, W.A., Gehre, M., Gröning, M., Meijer, H.A.J., Toman, B., and Verkouteren, R.M., 2006, After two decades a second anchor for the VPDB δ13C scale: Rapid Communications in Mass Spectrometry, v. 20, p. 3165-3166. DOI: 10.1002/rcm.2727 [Link]

Landwehr, J.M., and Coplen, T.B., 2006, Line-conditioned excess: a new method for characterizing stable hydrogen and oxygen isotope ratios in hydrologic systems, in Isotopes in Environmental Studies, Aquatic Forum 2004, International Atomic Energy Agency, IAEA-CSP-26, p. 132 - 135. [Link]

Révész, K., and Coplen, T.B., eds., 2006, Methods of the Reston Stable Isotope Laboratory: U.S. Geological Survey Techniques and Methods, book 10.

Winograd, I.J., Landwehr, J.M, Coplen, T.B., Sharp, W.D., Riggs, A.C., Ludwig, K.R., and Kolesar, P.T., 2006, Devils Hole δ18O record extended to mid-Holocene: Quaternary Research, v. 66, no. 2, p.202-212. DOI:10.1016/j.yqres.2006.06.003 [Link]

Hunt, R.J., Coplen, T.B., Haas, N.L., Saad, D.A., and Borchardt, M.A., 2005, Investigating surface water-well interaction using stable isotope ratios of water: Journal of Hydrology, v. 302, no. 1-4, p. 154-172. DOI:10.1016/j.jhydrol.2004.07.010 [Link]

Vogel, J.R., Barber, L.B., Furlong, E.T., Coplen, T.B., Verstraeten, I.M., and Meyer, M.T., 2005, Occurrence of selected pharmaceutical and non-pharmaceutical compounds and stable hydrogen and oxygen isotope ratios in a riverbank filtration study, Platte River, Nebraska, 2002 to 2005, Volume 2: U.S. Geological Survey Data Series 141. [Link]

Vogel, J.R., Harris, S.I., Coplen, T.B., Rice, E.W., and Verstraeten, I.M., 2005, Microbe concentrations, laser particle counts, and stable hydrogen and oxygen isotope ratios in samples from a riverbank filtration study, Platte River, Nebraska, 2002 to 2004: U.S. Geological Survey Data Series 133, p. 307-321. [Link]

Vogel, J.R., Verstraeten, I.M., Coplen, T.B., Furlong, E.T., Meyer, M.T., and Barber, L.B., 2005, Occurrence of selected pharmaceutical and non-pharmaceutical compounds and stable hydrogen and oxygen isotope ratios in a riverbank filtration study, Platte River, Nebraska, 2001 to 2003, Volume 1: U.S. Geological Survey Data Series 117. [Link]

Coplen, T. B., Böhlke, J.K., and Casciotti, K. L., 2004, Using dual bacterial denitrification to improve δ15N determinations of nitrates containing mass independent 17O: Rapid Communications in Mass Spectrometry, v. 18, no. 3, p. 245-250. DOI: 10.1002/rcm.1318 [Link]

Holden, N., Coplen, T., 2004, The periodic table of the elements: Chemistry International, v. 26, no. 1, p. 8–9. [Link]

Landwehr, J.M., and Coplen, T.B., 2004, The oxygen and hydrogen ratios in waters from the largest river systems of the United States, in Isotope Hydrology and Integrated Water Resources Management: Conference and Symposium Papers IAEA-CSP-23, International Atomic Energy Agency, Vienna, p.402-403. [Link]

Böhlke, J K, Mroczkowski, S J, and Coplen, T B, 2004, New reference materials for oxygen isotopes in nitrate: Isotope Hydrology and Integrated Water Resources Management: International Atomic Energy Agency: Vienna, p. 477-478.

Coplen, T B, 2003, Erratum: “Atomic Weights of the Elements 1999” [J. Phys. Chem. Ref. Data 30, 701 (2001)]: Journal of Physical and Chemical Reference Data, v. 32, iss. 2, 919 p.

Böhlke, J.K., Mroczkowski, S.J., and Coplen, T.B., 2003, Oxygen isotopes in nitrate: new reference materials for 18O:17O:16O measurements and observations on nitrate-water equilibration: Rapid Communications in Mass Spectrometry, v. 17, no. 16, p. 1835-1846. DOI: 10.1002/rcm.1123 [Link]

Qi, H.P., and Coplen, Tyler B., 2003, Evaluation of the 34S/32S ratio of Soufre de Lacq elemental sulfur isotopic reference material by continuous flow isotope-ratio mass spectrometry: Chemical Geology, v. 199, p. 183-187. DOI: 10.1016/S0009-2541(03)00075-5 [Link]

Qi, H., Coplen, T.B., Geilmann, H., Brand, W.A., Böhlke, J.K., 2003, Two new organic reference materials for δ13C and δ15N measurements and a new value for the δ13C of NBS 22 oil: Rapid Communications in Mass Spectrometry, v. 17, no. 22, p. 2483-2487. DOI: 10.1002/rcm.1219 [Link]

Coplen, T.B., Hopple, J.A., Böhlke, J.K., Peiser, H.S., Rieder, S.E., Krouse, H.R., Rosman, K.J.R., Ding, T., Vocke, Jr., R.D., Revesz, K.M., Lamberty, A., Taylor, P., and De Bièvre, P., 2002, Compilation of minimum and maximum isotope ratios of selected elements in naturally occurring terrestrial materials and reagents: U.S. Geological Survey Water-Resources Investigations Report 01-4222, 98p. [Link]

Becker, M.W., and Coplen, T.B., 2001, Use of deuterated water as a conservative artificial groundwater tracer: Hydrogeology Journal, v. 9 , no. 5, p. 512-516. DOI: 10.1007/s100400100157 [Link]

Brand, W.A., and Coplen, T.B., 2001, An interlaboratory study to test instrument performance of hydrogen dual-inlet isotope-ratio mass spectrometers: Fresenius' Journal of Analytical Chemistry, v. 370, p. 358-362. DOI: 10.1007/s002160100814 [Link]

Coplen, T.B., 2001, Atomic weights of the elements 1999: Journal of Physical and Chemical Reference Data, v. 30, p. 701-712. DOI: 10.1063/1.1395055 [Link]

Coplen, T.B., 2001, Atomic weights of the elements 1999: Pure and Applied Chemistry, v. 73, no. 4, p. 667-683. [Link]

Kendall. C., and Coplen, T.B., 2001, Distribution of oxygen-18 and deuterium in river waters across the United States: Hydrological Processes, v. 15, no. 7, p. 1363-1393. DOI: 10.1002/hyp.217 [Link]

Coplen, T.B., 2000, Laboratory information management system (LIMS) for light stable isotopes: U.S. Geological Survey Open-File Report 00-345, 121 p. [Link]

Coplen, T.B., and Kendall, C., 2000, Stable isotope and oxygen isotope ratios for selected sites of the U.S. Geological Survey's NASQAN and Benchmark surface-water networks: U.S. Geological Survey Open-File Report 00-160, 409 p. [Link]

Plummer, L.N., Busenberg, E., Böhlke, J.K., Carmody, R.W., Casile, G.C., Coplen, T.B., Doughten, M.W., Hannon, J.E., Kirkland, W., Michel, R.L., Nelms, D.L., Norton, B.C., Plummer, K.E., Qi, H., Revesz, K., Schlosser, P., Spitzer, S., Wayland, J.E. and Widman, P.K., 2000, Chemical and isotopic composition of water from springs, wells, and streams in parts of Shenandoah National Park, Virginia, and vicinity, 1995-1999: U.S. Geological Survey Open-File Report 00-373, 70 p. [Link]

Pomes, M.L., Larive, C.K., Thurman, E.M., Green, W.R., Orem, W.H., Rostad, C.E., Coplen, T.B., Cutak, B.J., and Dixon, A.M., 2000, Sources and Haloacetic Acid/Trihalomethane Formation Potentials of Aquatic Humic Substances in the Wakarusa River and Clinton Lake near Lawrence, Kansas: Environmental Science and Technology, v. 34, no. 20, p. 4278-4286. DOI: 10.1021/es991376j [Link]

Böhlke, J.K, Plummer, L.N., Busenberg, E., Coplen, T.B., Shinn, E.A., and Schlosser, P., 1999, Origins, residence times, and nutrient sources of marine ground waters beneath the Florida Keys and nearby offshore areas: U.S. Geological Survey, Open-File Report 99-181, p. 2-3. [Link]

Böhlke, J.K., Smith, R.L., Coplen, T.B., Busenberg, E., and LeBlanc, D.R., 1999, Recharge conditions and flow velocities of contaminated and uncontaminated ground waters at Cape Cod, Massachusetts: Evaluation of δ2H, δ180, and dissolved gases, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program - Proceedings of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 99-4018, p. 337-348.

Coplen, T. B., Herczeg, A. L., and Barnes, C., 1999, Isotope engineering—Using stable isotopes of the water molecule to solve practical problems, in Cook, P. G., and Herczeg, A. L., eds., Environmental Tracers in Subsurface Hydrology: Boston, Kluwer Academic Publishers, p. 79-110.

Peiser, H. S., and Coplen, T. B., 1999, Underestimation of uncertainty: The Chemical Intelligencer, v. 5, p. 55.

Coplen, T. B., 1998, A manual for a laboratory information management system (LIMS) for light stable isotopes--Version 7.0: U.S. Geological Survey Open-File Report 98‑284, 124 p. [Link]

Coplen, T. B., and Krouse, H. R., 1998, Sulphur isotope data consistency improved: Nature, v. 392, p. 32. DOI: 10.1038/32080 [Link]

Coplen, T. B., and Peiser, H. S., 1998, History of the recommended atomic weight values from 1882 to 1997: A comparison of differences from current values to the estimated uncertainties of earlier values: Pure and Applied Chemistry, v. 70, p. 237–257. [Link]

Hopple, J. A., Hannon, J. E., and Coplen, T. B., 1998, Comparison of two stable hydrogen isotope-ratio measurement techniques on Antarctic surface-water and ice samples: Chemical Geology, v. 152, p. 321-323. DOI: 10.1016/S0009-2541(98)00118-1 [Link]

Winograd, I. J., Riggs, A. C., Coplen, T. B., 1998, The relative contributions of summer and cool-season precipitation to groundwater recharge, Spring Mountains, Nevada, USA: Hydrogeology Journal, v. 6, p. 77-93. DOI: 10.1007/s100400050135 [Link]

Coplen, T. B., 1997, A laboratory information management system (LIMS) for light stable isotopes--Version 7.0: U.S. Geological Survey Open-File Report 97‑812, 118 p. [Link]

Carmody, R. W., Plummer, L. N., Busenberg, E., and Coplen, T. B., 1997, Methods for collection of dissolved sulfate and sulfide and analysis of their isotopic composition: U.S. Geological Survey Open-File Report 97‑234, 91 p.

Katz, B. G., Coplen, T. B., Bullen, T. D., and Davis, J. H., 1997, Use of Chemical and Isotopic Tracers to Characterize the Interactions Between Ground Water and Surface Water in Mantled Karst: Journal of Ground Water, v. 35, no. 6, p. 1014-1028. DOI: 10.1111/j.1745-6584.1997.tb00174.x [Link]

Krouse, H. R., and Coplen, T. B., 1997, Reporting of relative sulfur isotope-ratio data: Pure and Applied Chemistry, v. 69, p. 293-295. [Link]

Landwehr, J. M., Coplen, T. B., Ludwig, K. R., Winograd, I. J., and Riggs, A. C., 1997, Data from Devils Hole Core DH-11: U.S. Geological Survey Open-File Report 97‑792, 8 p. [Link]

Qi, H. P., Coplen, T. B., Wang, Q. Zh, and Wang, Y. H., 1997, Unnatural Isotopic Composition of Lithium Reagents: Analytical Chemistry, v. 69, p. 4076-4078. DOI: 10.1021/ac9704669 [Link]

Winograd, I. J., Landwehr, J. M., Ludwig, K. R., Coplen, T. B., and Riggs, A. C., 1997, Duration and Structure of the Past Four Interglaciations: Quaternary Research, v. 48, no. 2, p. 141-154. DOI: 10.1006/qres.1997.1918 [Link]

Coplen, T. B., 1996, Atomic weights of the elements 1995: Pure and Applied Chemistry, v. 68, p. 2339–2359. DOI: 10.1351/pac199668122339 [Link]

Coplen, T. B., 1996, Editorial: More uncertainty than necessary, Paleoceanography, v. 11, no. 4, p. 369‑370. DOI: 10.1029/96PA01420 [Link]

Coplen, T. B., 1996, Guidelines for reporting certain isotopic values relevant to ground‑water studies, Ground Water, v. 34, p. 388. DOI: 10.1111/j.1745-6584.1996.tb02018.x [Link]

Coplen, T. B., 1996, New guidelines for the reporting of stable hydrogen, carbon, and oxygen isotope ratio data: Geochimica et Cosmochimica Acta, v. 60, no. 17, p. 3359. DOI: 10.1016/0016-7037(96)00263-3 [Link]

Coplen, T. B., De Bièvre, P., Krouse, H. R., Vocke, R. D., Jr., Groening, M., and Rozanski, K., 1996, Ratios for light‑element isotopes standardized for better interlaboratory comparison, Eos, v. 77, no. 27, p. 255. DOI: 10.1029/96EO00182 [Link]

Deák, J., and Coplen, T. B., 1996, Identification of Holocene and Pleistocene groundwaters in Hungary using oxygen and hydrogen isotopic ratios, in Isotope in Water Resources Management, Vol. 1: Vienna, International Atomic Energy Agency, p. 438.

Revesz, K., Coplen, T. B., Baedecker, M. J., Glynn, P. D., and Hult, M., 1996, Investigation of methane production and consumption by use of stable isotopes, in Isotope in Water Resources Management, v. 1: Vienna, International Atomic Energy Agency, p. 381-387.

Coplen, T. B., 1995, Reporting of stable carbon, hydrogen, and oxygen isotopic abundances in Reference and intercomparison materials for stable isotopes of light elements: Vienna, International Atomic Energy Agency, TECDOC-825, p. 31-34. [Link]

Coplen, T. B., 1995, Discontinuance of the use of SMOW (Standard Mean Ocean Water) and PDB (Peedee belemnite), Bulletin of Volcanology, v. 57, no. 6, p. 462. DOI: 10.1007/BF00300990 [Link]

Coplen, T. B., 1995, Discontinuance of SMOW and PDB, Nature, v. 375, p. 285. DOI: 10.1038/375285a0 [Link]

Coplen, T. B., and Böhlke, J.K., 1995, Interlaboratory comparison of reference materials for nitrogen-isotope-ratio measurements in Reference and intercomparison materials for stable isotopes of light elements: Vienna, International Atomic Energy Agency, TECDOC-825, p. 67‑74. [Link]

Coplen, T. B., and Hopple, J., 1995, Audit of VSMOW distributed by the United States National Institute of Standards and Technology in Reference and intercomparison materials for stable isotopes of light elements: Vienna, International Atomic Energy Agency, TECDOC-825, p. 35-38. [Link]

Revesz, K., Coplen, T. B., Baedecker, M. J., Glynn, P., and Hult, M., 1995, Methane production and consumption monitored by stable hydrogen and carbon isotope ratios at Bemidji, Minnesota: Applied Geochemistry, v. 10, p. 505‑516. DOI: 10.1016/0883-2927(95)00021-6 [Link]

Coplen, T. B., 1994, Reporting of stable hydrogen, carbon, and oxygen isotopic abundances: Pure and Applied Chemistry, v. 66, p. 273-276. [Link]

Coplen, T. B., and Harper, I. T., 1994, An improved technique for the 2H/1H analysis of urines from diabetic volunteers: Biological Mass Spectrometry, v. 23, no. 7, p. 437-439. DOI: 10.1002/bms.1200230709 [Link]

Coplen, T. B., Greenwood, N. N., and Peiser, H. S., 1994, 1993 Table of Standard Atomic Weights Abridged to Five Significant Figures: Inorganica Chemica Acta, v. 217, p. 217–218. DOI: 10.1016/0020-1693(93)03674-Y [Link]

Coplen, T. B., Winograd, I. J., Landwehr, J. M., and Riggs, A. C., 1994, 500,000-Year Stable Carbon Isotopic Record From Devils Hole, Nevada: Science, v. 263, no. 5145, p. 361-365. DOI: 10.1126/science.263.5145.361 [Link]

Landwehr, J. M., Winograd, I. J., and Coplen, T. B., 1994, No verification for Milankovitch: Nature, v. 368, p. 594. DOI: 10.1038/368594a0 [Link]

Böhlke, J. K., Gwinn, C. J. and Coplen, T. B., 1993, New reference materials for nitrogen-isotope-ratio measurements: Geostandard Newsletter, v. 17, p. 159-164. DOI: 10.1111/j.1751-908X.1993.tb00131.x [Link]

Coplen, T. B., 1993, Uses of environmental isotopes, in Alley, W. M., ed., Regional Ground-Water Quality: New York, Van Nostrand Reinhold, p. 227-254. ISBN: 978-0-471-28453-6 [Link]

Dunkle, S. A., Plummer, L. N., Busenberg, E., Phillips, P. J., Denver, J. M., Hamilton, P. A., Michel, R. L., and Coplen, T. B., 1993, Chlorofluorocarbons (CCl3F and CCl2F2) as Dating Tools and Hydrologic Tracers in Shallow Groundwater of the Delmarva Peninsula, Atlantic Coastal Plain, United States: Water Resources Research, v. 29, p. 3837-3860. DOI: 10.1029/93WR02073 [Link]

Landwehr, J. M., Winograd, I. J., Coplen, T. B., Riggs, A. C., Ludwig, K. R., and Szabo, B. J., 1993, Stochastic analysis of δ18O and δ13C time series found in a continuous 500,000-year climatic record from Great Basin vein calcite, in Kelmelis, J.A., ed., Proceedings of the U.S. Geological Survey Global Change Forum: U. S. Geological Survey Circular 1086, p. 86.

Landwehr, J. M., Winograd, I. J., Coplen, T. B., Riggs, A. C., Ludwig, K. R., and Szabo, B. J., 1993, Stochastic analysis of δ18O and δ13C time series found in a continuous 500,000-year climatic record from Great Basin vein calcite, in Kelmelis, J.A., ed., Proceedings of the U.S. Geological Survey Global Change Forum: U. S. Geological Survey Circular 1086, p. 86.

Coplen, T. B., Krouse, H. R., and Böhlke, J.K., 1992, Reporting of nitrogen-isotope abundances: Pure and Applied Chemistry, v. 64, p. 907–908. DOI: 10.1351/pac199264060907 [Link]

Winograd, I. J., Coplen, T. B., Landwehr, J. M., Riggs, A. C., Ludwig, K. R., Szabo, B. J., Kolesar, P. T., Revesz, K. M., 1992, Continuous 500,000-Year Climate Record from Vein Calcite in Devils Hole, Nevada: Science, v. 258, p. 255–260. DOI:10.1126/science.258.5080.255 [Link]

Coplen, T. B., Wildman, J. D., and Chen, J., 1991, Improvements in the gaseous hydrogen— water equilibration technique for hydrogen isotope-ratio analysis: Analytical Chemistry, v. 63, p. 910-912. DOI: 10.1021/ac00009a014 [Link]

Revesz, K. and Coplen, T. B., 1991, Caution on the use of Viton or FETFE O-rings in carbon dioxide sample containers for δ18O analysis: Chemical Geology (Isotope Geoscience Section): v. 86, p. 259-261. DOI: 10.1016/0168-9622(91)90054-Z [Link]

Revesz, K., and Coplen, T. B., 1990, Gas chromatographic separation of carbon dioxide and nitrous oxide for stable isotopic analysis of carbon dioxide: Analytical Chemistry, v. 62, p. 972–973. DOI: 10.1021/ac00208a014 [Link]

Davis, G. H., and Coplen, T. B., 1989, Late Cenozoic paleohydrogeology of the Western San Joaquin Valley, California, as related to structural movements in the Central Coast Ranges: Geological Society of America Special Paper 234, 40 p. DOI: 10.1130/SPE234-p1 [Link]

Winograd, I. J., and Coplen, T. B., 1989, Response: Great Basin calcite vein and the Pleistocene time scale, by R. G. Johnson and H. E. Wright, Jr., 1989, (in Science, v. 246, p. 262): Science, v. 246, p. 262–263. DOI:10.1126/science.246.4927.262-a [Link]

Coplen, T.B., 1988, Normalization of oxygen and hydrogen isotope data: Chemical Geology (Isotope Geosciences Section), v. 72, p. 293–297. DOI: 10.1016/0168-9622(88)90042-5 [Link]

Winograd, I. J., Szabo, B. J., Coplen, T. B., and Riggs, A. C., 1988, A 250,000-year climatic record from Great Basin vein calcite: Implications for Milankovitch theory: Science, v. 242, p. 1275–1280. DOI:10.1126/science.242.4883.1275 [Link]

Davis, G. H., and Coplen, T. B., 1987, Stable isotopic composition of groundwater of Central California as an indicator of Mid‑Pleistocene tectonic evolution, in Isotope Techniques in Water Resources Development, Proceedings of a Symposium: International Atomic Energy Agency, Vienna, p. 225–239.

Stallard, M. L., Winnett, T. C., Truesdell, A. H., Coplen, T. B., Kendall, C., White, L. D., Janik, C. J., and Thompson, J. M., 1987, Patterns of change in water isotopes from Cerro Prieto Geothermal Field, Baja California, Mexico—1977–1986, Transactions of the Geothermal Resources Council, v. 11, p. 203–210. [Link]

Kendall, C., and Coplen, T. B., 1985, Multisample conversion of water to hydrogen by zinc for stable isotope determination: Analytical Chemistry, v. 57, p. 1437–1440. DOI: 10.1021/ac00284a058 [Link]

Winograd, I. J., Szabo, B. J., Coplen, T. B., Riggs, A. C., and Kolesar, P. T., 1985, Two‑million year record of deuterium depletion in Great Basin Ground Waters: Science, v. 227, p. 519–522. DOI:10.1126/science.227.4686.519 [Link]

Coplen, T. B., Kendall, C., and Hopple, J., 1983, Comparison of stable isotope reference samples: Nature, v. 302, p. 236–238. DOI: 10.1038/302236a0 [Link]

Winograd, I. J., Szabo, B., Coplen, T. B., and Doty, G. C., 1983, Pliocene and Pleistocene calcite veins as indicators of paleohydrologic, paleoclimatologic, and neotectonic events, southern Great Basin: An initial appraisal, in Cronin, T.M., Cannon, W.F., and Poore, R.Z., eds., Paleoclimate and Mineral Deposits: U.S. Geological Survey Circular 822.

Coplen, T. B., and Kendall, C., 1982, Preparation and stable isotope determination of NBS‑16 and NBS‑17 carbon dioxide reference samples: Analytical Chemistry, v. 54, p. 2611–2612. DOI: 10.1021/ac00251a050 [Link]

Coplen, T. B., Kendall, C., and Barnes, I. L., 1982, Comment on Two new carbonate stable isotope standards, by Irving Friedman, James O'Neil, and Gerald Cebula, 1982, (in Geostandards Newsletter, v. 6, p. 11–12): Geostandards Newsletter, v. 6, p. 257–258. DOI: 10.1111/j.1751-908X.1982.tb00361.x [Link]

Coplen, T. B., 1981, Pressure control of a gas by a calculator‑operated mercury piston: Analytical Chemistry, v. 53, p. 940–942. DOI: 10.1021/ac00229a057 [Link]

Coplen, T. B., and Wildman, J. D., 1981, An improved controller for mercury diffusion pumps: Journal of Vacuum Science Technology, v. 19, p. 112–114. DOI: 10.1116/1.570999 [Link]

Muir, K. S., and Coplen, T. B., 1981, Tracing ground‑water movement using the stable isotopes of oxygen and hydrogen, Penitencia Creek alluvial fan, Santa Clara County, California: U.S. Geological Survey Water Supply Paper 2075, 18 p.

Truesdell, A. H., Thompson, J. M., Coplen, T. B., Nehring, N. L., and Janik, C. J., 1980, The origin of the Cerro Prieto geothermal brine: Geothermics, v. 10, p. 225–238. DOI: 10.1016/0375-6505(81)90006-7 [Link]

Truesdell, A. H., Rye, R. O., Pearson, F. J., Jr., Olson, E. R., Nehring, N. L., Whelan, J. F., Huebner, M. A., and Coplen, T. B., 1979, Preliminary isotopic studies of fluids from the Cerro Prieto Geothermal field: Geothermics, v. 8, p. 223–229. DOI: 10.1016/0375-6505(79)90044-0 [Link]

Pearson, F. J., Jr., and Coplen, T. B., 1978, Stable isotope studies of lakes, in Lerman, A., ed., Lakes: Chemistry, Geology, Physics: New York, Springer‑Verlag, p. 325–336.

McMurtry, G. M., Fan, P., and Coplen, T. B., 1977, Chemical and isotopic investigations of groundwater in potential geothermal areas in Hawaii: American Journal of Science, v. 277, p. 438–458. DOI: 10.2475/ajs.277.4.438 [Link]

Coplen, T.B., 1976, Cooperative geochemical resource assessment of the Mesa geothermal system: Final report to the U.S.D.I., Bureau of Reclamation, contract No. 14‑06‑300‑2479: Institute of Geophysics and Planetary Physics, University of California, Riverside, 97 p.

Coplen, T. B., Kolesar, P., Taylor, R. E., Kendall, C., and Mooser, C., 1975, Geochemical studies of water, calcite, and silicates, pt. 4 of Investigations of the Dunes geothermal anomaly, Imperial Valley, California: Institute of Geophysics and Planetary Physics, University of California, Riverside, 42 p. [Link]

Coplen, T. B., and Kolesar, P., 1974, Geochemistry of geothermal fluids, pt. 1 of Investigations of the Dunes geothermal anomaly, Imperial Valley, California: Institute of Geophysical and Planetary Physics, University of California, Riverside, 21 p. [Link]

Supko, R. R., Stoffers, P., and Coplen, T. B., 1974, Petrography and geochemistry of Red Sea dolomite: Deep Sea Drilling Project, Initial Reports of the Deep Sea Drilling Project, v. 23, p. 867–878. [Link]

Coplen, T. B., 1973, A double‑focusing, double‑collecting mass spectrometer for light stable isotope ratio analysis: International Journal Mass Spectrometry and Ion Physics, v. 11, p. 37–40. DOI: 10.1016/0020-7381(73)80053-1 [Link]

Coplen, T. B., 1973, A geothermal resources reconnaissance of the Imperial Valley and surrounding area, California, utilizing the sodium‑potassium‑calcium geochemical exploration technique: University of California, Riverside, 3 p.

Coplen, T. B., 1973, Cooperative geochemical investigation of geothermal resources in the Imperial Valley and Yuma areas: Report to the Bureau of Reclamation, University of California, Riverside, 22 p.

Coplen, T. B., and Clayton, R. N., 1973, Hydrogen isotopic composition of NBS and IAEA stable isotope water reference samples: Geochimica Cosmochimica Acta, v. 37, p. 2347–2349. DOI: 10.1016/0016-7037(73)90108-7 [Link]

Coplen, T. B., Combs, J., Elders, W. A., Rex, R. W., Burkhalter, G., and Laird, R., 1973, Preliminary findings of an investigation of the Dunes thermal anomaly, Imperial Valley, California: University of California, Riverside, 48 p.

Coplen, T. B., and Hanshaw, B. B., 1973, Oxygen and hydrogen isotopic fractionation, pt. 1 of Ultrafiltration by a compacted clay membrane: Geochimica Cosmochimica Acta, v. 37, p. 2295–2310. DOI; 10.1016/0016-7037(73)90105-1 [Link]

Coplen, T. B., and Schlanger, S. 0., 1973, Oxygen and carbon isotope studies of carbonate sediments from Site 167, Magellan Rise, Leg 17: Deep Sea Drilling Project, Initial Reports of the Deep Sea Drilling Project, v. 17, p. 505–509. [Link]

Hanshaw, B. B., and Coplen, T. B., 1973, Sodium exclusion at various ionic strengths, pt. 2 of Ultrafiltration by a compacted clay membrane: Geochimica Cosmochimica Acta, v. 37, p. 2311–2317. DOI: 10.1016/0016-7037(73)90106-3 [Link]

Supko, P. R., Stoffers, P., and Coplen, T. B., 1973, Authigenic dolomites from the Red Sea: American Association of Petroleum Geologists Bulletin, v. 57, p. 807–808. [Link]

Coplen, T. B., 1972, Origin of the geothermal waters in the Imperial Valley of Southern California, in Rex and others, Cooperative Investigations of Geothermal Resources in the Imperial Valley Area and their Potential Value for Desalting of Water and Other Purposes: Report to the Bureau of Reclamation, Contract No. 14-06-300-2258, University of California, Riverside, p. E1–E33.

Coplen, T. B., 1971, Isotopic geochemistry of water from the Imperial Valley, in Rex and others, Geological‑Geophysical‑Geochemical Investigations of Geothermal Resources in the Imperial Valley of California: University of California, Riverside, p. 113–118.

Coplen, T. B., 1970, Isotopic fractionation of water by ultra-filtration, Ph.D. thesis, University of Chicago, 96 p. [Link]






                           

My Science Topics


Science Topic
Subtopic
Techniques and Methodsisotopic analysis
Techniques and Methodslaboratory methods



My USGS Science Strategy Areas

A Water Census of the United States

Research Objectives

Several light stable isotopes (H, C, N, O, Si, and S) show variations in their isotope abundances and can be used for the study of evaporation, ground-water mixing, biotransformations, lake or reservoir circulation and stratification and associated hydrochemical phenomena. These isotope fractionations are related to: (1) purely physical processes; (2) heterogeneous chemical equilibria; and (3) reaction kinetics. Many of these processes are not sufficiently understood or quantified to make the most effective use of stable isotope techniques in hydrologic research. Objectives of this project are to develop theoretical and instrumental mass spectrometric techniques through experimental investigation and to test techniques in suitable field locations, to aid in more complete utilization of light stable isotope phenomena in hydrologic studies. For additional information, see the Reston Stable Isotope Laboratory, www.isotopes.usgs.gov.

The Reston Stable Isotope Laboratory, which provides isotopic analysis of several thousand samples yearly to both the operational program and the NRP, and is a major service to the WRD. Because the results of such analytical services may be used in court cases or in national security activities, the laboratory strives for the highest quality measurements and develops state-of-the-art analytical methods.


Contact Information

Tyler Coplen
12201 Sunrise Valley Dr
Reston, VA 20192-0002
tbcoplen@usgs.gov
703-648-5862
703-648-5832 - Fax
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