Tyler B. Coplen, Ph.D.
Dr. Tyler Coplen is the Director of the Reston Stable Isotope Laboratory of the USGS Water Resources Mission Area.
Tyler B. Coplen is an ST scientist in geochemistry. His research focuses on isotope hydrology, development of innovative analytical techniques for isotopic analysis of light elements, provides forensic-quality analytical services to USGS programs, and creates isotopic reference materials for calibration of mass spectrometers and laser absorption spectrometers in isotope laboratories worldwide. In 1974, he joined the U.S. Geological Survey, and in 1978, he set up the Reston Stable Isotope Laboratory, please visit the Reston Stable Isotope Laboratory website. He set up and led the Subcommittee on Natural Isotopic Fractionation (1985–2002) of the International Union of Pure and Applied Chemistry (IUPAC) that resulted in a dozen elements being assigned standard atomic-weight values that are intervals, instead of single values, to indicate that atomic-weight values of many elements are not constants of nature.
Professional Experience
Assistant Research Geochemist, University of California, Riverside 1970–1974
Education and Certifications
Ph.D. 1970, University of Chicago, Department of Geophysical Sciences, Advisor: Prof. Robert N. Clayton
M.S. 1968, University of Chicago, Department of Geophysical Sciences
B.S. 1966, Pacific Lutheran University, Major: Physics
Affiliations and Memberships*
Honorary Member, Commission on Isotopic Abundances and Atomic Weights of the International Union of Pure and Applied Chemistry
Science and Products
Filter Total Items: 18
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Filter Total Items: 153
Antarctic ice-core water (USGS49) – A new isotopic reference material for δ2H and δ18O measurements of water Antarctic ice-core water (USGS49) – A new isotopic reference material for δ2H and δ18O measurements of water
As a result of the scarcity of isotopic reference waters for daily use, a new secondary isotopic reference material for international distribution has been prepared from ice-core water from the Amundsen–Scott South Pole Station. This isotopic reference material, designated as USGS49, was filtered, homogenised, loaded into glass ampoules, sealed with a torch, autoclaved to eliminate...
Authors
Jennifer Lorenz, Haiping Qi, Tyler Coplen
New organic reference materials for hydrogen, carbon, and nitrogen stable isotope-ratio measurements: caffeines, n-alkanes, fatty acid methyl esters, glycines, L-valines, polyethylenes, and oils New organic reference materials for hydrogen, carbon, and nitrogen stable isotope-ratio measurements: caffeines, n-alkanes, fatty acid methyl esters, glycines, L-valines, polyethylenes, and oils
An international project developed, quality-tested, and determined isotope−δ values of 19 new organic reference materials (RMs) for hydrogen, carbon, and nitrogen stable isotope-ratio measurements, in addition to analyzing pre-existing RMs NBS 22 (oil), IAEA-CH-7 (polyethylene foil), and IAEA-600 (caffeine). These new RMs enable users to normalize measurements of samples to isotope−δ...
Authors
Arndt Schimmelmann, Haiping Qi, Tyler Coplen, Willi Brand, Jon Fong, Wolfram Meier-Augenstein, Helen Kemp, Blaza Toman, Annika Ackermann, Sergey Assonov, Anita Aerts-Bijma, Ramona Brejcha, Yoshito Chikaraishi, Tamim Darwish, Martin Elsner, Matthias Gehre, Heike Geilmann, Manfred Groning, Jean-Francois Helie, Sara Herrero-Martin, Harro Meijer, Peter Sauer, Alex Sessions, Roland Werner
Isotope-abundance variations and atomic weights of selected elements: 2016 (IUPAC Technical Report) Isotope-abundance variations and atomic weights of selected elements: 2016 (IUPAC Technical Report)
There are 63 chemical elements that have two or more isotopes that are used to determine their standard atomic weights. The isotopic abundances and atomic weights of these elements can vary in normal materials due to physical and chemical fractionation processes (not due to radioactive decay). These variations are well known for 12 elements (hydrogen, lithium, boron, carbon, nitrogen...
Authors
Tyler Coplen, Yesha Shrestha
Updated atomic weights: Time to review our table Updated atomic weights: Time to review our table
Despite common belief, atomic weights are not necessarily constants of nature. Scientists’ ability to measure these values is regularly improving, so one would expect that the accuracy of these values should be improving with time. It is the task of the IUPAC (International Union of Pure and Applied Chemistry) Commission on Isotopic Abundances and Atomic Weights (CIAAW) to regularly...
Authors
Tyler Coplen, Fabienne Meyers, Norman Holden
Isotopic compositions of the elements 2013 (IUPAC Technical Report) Isotopic compositions of the elements 2013 (IUPAC Technical Report)
The Commission on Isotopic Abundances and Atomic Weights (ciaaw.org) of the International Union of Pure and Applied Chemistry (iupac.org) has revised the Table of Isotopic Compositions of the Elements (TICE). The update involved a critical evaluation of the recent published literature. The new TICE 2013 includes evaluated data from the “best measurement” of the isotopic abundances in a...
Authors
Juris Meija, Tyler Coplen, Michael Berglund, Willi A. Brand, Paul De Bievre, Manfred Gröning, Norman Holden, Johanna Irrgeher, Robert Loss, Thomas Walczyk, Thomas Prohaska
Atomic weights of the elements 2013 (IUPAC Technical Report) Atomic weights of the elements 2013 (IUPAC Technical Report)
The biennial review of atomic-weight determinations and other cognate data has resulted in changes for the standard atomic weights of 19 elements. The standard atomic weights of four elements have been revised based on recent determinations of isotopic abundances in natural terrestrial materials: cadmium to 112.414(4) from 112.411(8), molybdenum to 95.95(1) from 95.96(2), selenium to 78...
Authors
Juris Meija, Tyler Coplen, Michael Berglund, Willi A. Brand, Paul De Bievre, Manfred Gröning, Norman Holden, Johanna Irrgeher, Robert Loss, Thomas Walczyk, Thomas Prohaska
Science and Products
Filter Total Items: 18
No Result Found
Filter Total Items: 153
Antarctic ice-core water (USGS49) – A new isotopic reference material for δ2H and δ18O measurements of water Antarctic ice-core water (USGS49) – A new isotopic reference material for δ2H and δ18O measurements of water
As a result of the scarcity of isotopic reference waters for daily use, a new secondary isotopic reference material for international distribution has been prepared from ice-core water from the Amundsen–Scott South Pole Station. This isotopic reference material, designated as USGS49, was filtered, homogenised, loaded into glass ampoules, sealed with a torch, autoclaved to eliminate...
Authors
Jennifer Lorenz, Haiping Qi, Tyler Coplen
New organic reference materials for hydrogen, carbon, and nitrogen stable isotope-ratio measurements: caffeines, n-alkanes, fatty acid methyl esters, glycines, L-valines, polyethylenes, and oils New organic reference materials for hydrogen, carbon, and nitrogen stable isotope-ratio measurements: caffeines, n-alkanes, fatty acid methyl esters, glycines, L-valines, polyethylenes, and oils
An international project developed, quality-tested, and determined isotope−δ values of 19 new organic reference materials (RMs) for hydrogen, carbon, and nitrogen stable isotope-ratio measurements, in addition to analyzing pre-existing RMs NBS 22 (oil), IAEA-CH-7 (polyethylene foil), and IAEA-600 (caffeine). These new RMs enable users to normalize measurements of samples to isotope−δ...
Authors
Arndt Schimmelmann, Haiping Qi, Tyler Coplen, Willi Brand, Jon Fong, Wolfram Meier-Augenstein, Helen Kemp, Blaza Toman, Annika Ackermann, Sergey Assonov, Anita Aerts-Bijma, Ramona Brejcha, Yoshito Chikaraishi, Tamim Darwish, Martin Elsner, Matthias Gehre, Heike Geilmann, Manfred Groning, Jean-Francois Helie, Sara Herrero-Martin, Harro Meijer, Peter Sauer, Alex Sessions, Roland Werner
Isotope-abundance variations and atomic weights of selected elements: 2016 (IUPAC Technical Report) Isotope-abundance variations and atomic weights of selected elements: 2016 (IUPAC Technical Report)
There are 63 chemical elements that have two or more isotopes that are used to determine their standard atomic weights. The isotopic abundances and atomic weights of these elements can vary in normal materials due to physical and chemical fractionation processes (not due to radioactive decay). These variations are well known for 12 elements (hydrogen, lithium, boron, carbon, nitrogen...
Authors
Tyler Coplen, Yesha Shrestha
Updated atomic weights: Time to review our table Updated atomic weights: Time to review our table
Despite common belief, atomic weights are not necessarily constants of nature. Scientists’ ability to measure these values is regularly improving, so one would expect that the accuracy of these values should be improving with time. It is the task of the IUPAC (International Union of Pure and Applied Chemistry) Commission on Isotopic Abundances and Atomic Weights (CIAAW) to regularly...
Authors
Tyler Coplen, Fabienne Meyers, Norman Holden
Isotopic compositions of the elements 2013 (IUPAC Technical Report) Isotopic compositions of the elements 2013 (IUPAC Technical Report)
The Commission on Isotopic Abundances and Atomic Weights (ciaaw.org) of the International Union of Pure and Applied Chemistry (iupac.org) has revised the Table of Isotopic Compositions of the Elements (TICE). The update involved a critical evaluation of the recent published literature. The new TICE 2013 includes evaluated data from the “best measurement” of the isotopic abundances in a...
Authors
Juris Meija, Tyler Coplen, Michael Berglund, Willi A. Brand, Paul De Bievre, Manfred Gröning, Norman Holden, Johanna Irrgeher, Robert Loss, Thomas Walczyk, Thomas Prohaska
Atomic weights of the elements 2013 (IUPAC Technical Report) Atomic weights of the elements 2013 (IUPAC Technical Report)
The biennial review of atomic-weight determinations and other cognate data has resulted in changes for the standard atomic weights of 19 elements. The standard atomic weights of four elements have been revised based on recent determinations of isotopic abundances in natural terrestrial materials: cadmium to 112.414(4) from 112.411(8), molybdenum to 95.95(1) from 95.96(2), selenium to 78...
Authors
Juris Meija, Tyler Coplen, Michael Berglund, Willi A. Brand, Paul De Bievre, Manfred Gröning, Norman Holden, Johanna Irrgeher, Robert Loss, Thomas Walczyk, Thomas Prohaska
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government