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: 21
Stable isotopic compositions of volatile organic compound reference materials USGS96-105 measured at the U.S. Geological Survey Reston Stable Isotope Laboratory (RSIL), 2024–2025 Stable isotopic compositions of volatile organic compound reference materials USGS96-105 measured at the U.S. Geological Survey Reston Stable Isotope Laboratory (RSIL), 2024–2025
Ten volatile organic compound matrix reference materials (RMs) were analyzed for hydrogen, carbon, nitrogen, oxygen, and sulfur stable isotopic compositions at the Reston Stable Isotope Laboratory (RSIL) of the U.S. Geological Survey from 2024-2025. The RMs are acetonitrile, benzaldehyde, bis(methylthio)methane, dimethylsulfide, ethyl 2-methylbutyrate, furfural, 2-methyl-1-butanol, 1...
Measurements of concentration, fluorescence, and absorbance characteristics of DOC and stable hydrogen and oxygen isotope analysis of pore water from riparian wetlands in Denmark from September 2022 to October 2023 Measurements of concentration, fluorescence, and absorbance characteristics of DOC and stable hydrogen and oxygen isotope analysis of pore water from riparian wetlands in Denmark from September 2022 to October 2023
Wetlands play an important role in carbon retention, which is greatly dependent on hydrological conditions. Therefore, the interest in wetland hydrology has increased over recent decades. In wetland hydrology, stable water isotopes (δ2H, δ18O) have found increasing use, as laser-based instruments have become readily available and allow for faster analysis and lower costs. However, the...
Carbon and oxygen isotopic compositions of NBS 19 limestone isotopic reference material and its byproduct calcite having finer grain size, measured at the U.S. Geological Survey Reston Stable Isotope Laboratory (RSIL), 2025 Carbon and oxygen isotopic compositions of NBS 19 limestone isotopic reference material and its byproduct calcite having finer grain size, measured at the U.S. Geological Survey Reston Stable Isotope Laboratory (RSIL), 2025
Approximately 3 to 4 kg of NBS 19 limestone, prepared in 1982 by the U.S. Geological Survey (USGS), serves as a primary reference for the carbon isotope scales VPDB and VPDB-LSVEC and the oxygen isotope scale VPDB. Its consensus values are +1.95 ‰ for δ¹³C and –2.2 ‰ for δ¹⁸O measurements. After more than three decades of distribution, the number of units labeled “NBS 19” shrunk...
ICP-MS measurements and R Code to determine provenance soil type from analyses of Pinus ponderosa ash collected in Arizona and Colorado ICP-MS measurements and R Code to determine provenance soil type from analyses of Pinus ponderosa ash collected in Arizona and Colorado
Needle samples from 140 Pinus ponderosa were analyzed for trace elements via inductively coupled plasma mass spectrometry (ICP-MS). Samples were collected from eight locations representing five distinct soil types across the Colorado Plateau near Flagstaff, Arizona and Boulder, Colorado. Data includes a full spectral scan between m/z 5-245 which was condensed to 72 dominant atomic masses
Stable hydrogen and oxygen isotopic composition of surface and groundwater samples from central and eastern Washington, USA Stable hydrogen and oxygen isotopic composition of surface and groundwater samples from central and eastern Washington, USA
In this data release, hydrogen-2 and oxygen-18 isotope ratios are presented for 158 unique sites in central and eastern Washington. There are 16 unique surface water sites with a total of 140 samples, and 142 groundwater sites with a total of 167 samples. Sample dates range from February 1993 to February 2021. Stable isotope analysis of water utilizes slight differences in the mass of...
Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Virginia and West Virginia National Atmospheric Deposition Program (NADP) sites Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Virginia and West Virginia National Atmospheric Deposition Program (NADP) sites
The stable hydrogen (delta 2H) and oxygen (delta 18O) isotopic compositions of more than 1,400 daily or weekly composite samples of precipitation from four National Atmospheric Deposition Program (NADP) sites (VA10, VA27, VA28, and WV99) in Virginia and West Virginia were analyzed on archived samples obtained from NADP over various time periods from as early as 1998. The samples are from...
Tables and figures for the unrecognized role of uranium transport in the Devils Hole, Nevada climate record Tables and figures for the unrecognized role of uranium transport in the Devils Hole, Nevada climate record
For more than a half million years, dense vein calcite has been precipitating in Devils Hole, located about 115 km northwest of Las Vegas, Nevada. This process also occurs in Devils Hole Cave 2, which is hydrologically connected and situated about 200 meters north of the original Devils Hole cave. Calcite has been precipitating in this natural laboratory in oxygen isotopic equilibrium at...
Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Colorado and Utah National Atmospheric Deposition Program (NADP) sites Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Colorado and Utah National Atmospheric Deposition Program (NADP) sites
The stable hydrogen (delta 2H) and oxygen (delta 18O) isotopic compositions of more than 4,300 weekly composite samples of precipitation from thirteen National Atmospheric Deposition Program (NADP) sites (CO02, CO08, CO09, CO10, CO21, CO89, CO91, CO92, CO93, CO96, CO97, CO98, and UT09) in Colorado and Utah were analyzed on archived samples obtained from NADP over various time periods...
Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Delaware, Maryland, New Jersey, New York, and Pennsylvania National Atmospheric Deposition Program (NADP) sites Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Delaware, Maryland, New Jersey, New York, and Pennsylvania National Atmospheric Deposition Program (NADP) sites
The stable hydrogen (delta 2H) and oxygen (delta 18O) isotopic compositions of more than 6,400 daily or weekly composite samples of precipitation from nine National Atmospheric Deposition Program (NADP) sites (DE02, MD07, NJ99, NY67, NY68, PA00, PA15, PA72, and PA98) in New York, New Jersey, Delaware, Maryland and Pennsylvania were analyzed on archived samples obtained from NADP over...
Chemical and isotopic compositions of tropical wood samples Chemical and isotopic compositions of tropical wood samples
Illegal logging is one of the leading causes of deforestation today. Sadly, tree species indigenous to regions critical to maintaining Earth?s ecological diversity also possess properties (i.e. appearance, aroma, etc.) desirable to humans, which often leads to exploitation. In 1992, due to illegal logging, Brazilian rosewood (Dalbergia nigra) became the first ever tree species to be...
USGS46a Greenland ice core water ? A reference material for stable hydrogen and oxygen isotopic composition of water USGS46a Greenland ice core water ? A reference material for stable hydrogen and oxygen isotopic composition of water
Ice core from Greenland was melted, filtered, and homogenized. Its stable hydrogen (δ2H) and oxygen (δ18O) isotopic compositions were adjusted to approximately match those of USGS46 ice core water (δ2H = ?235.8 ? and δ18O = ?29.80 ?). This isotopic reference water, USGS46a, was loaded into glass ampules, sealed, autoclaved to eliminate biological activity, and calibrated by dual-inlet...
Data on Produced Water Quality and Quantities from Hydraulically Fractured Williston Basin Oil Wells Data on Produced Water Quality and Quantities from Hydraulically Fractured Williston Basin Oil Wells
This dataset contains compositional data on 17 produced water samples from hydraulically fractured unconventional oil wells completed in the Middle Bakken and Three Forks Formations. The oil wells are located in five different wellfields across the Williston Basin. Specific gravity, conductivity, temperature, pH and oxidation-reduction potential for each sample was measured in the field...
Filter Total Items: 162
Triple oxygen isotope compositions of isotopic reference waters: Implications for VSMOW-Scale and VSMOW-SLAP-Scale Δ′¹⁷O calibration Triple oxygen isotope compositions of isotopic reference waters: Implications for VSMOW-Scale and VSMOW-SLAP-Scale Δ′¹⁷O calibration
Triple oxygen isotope ratios of waters are commonly reported on the VSMOW–SLAP scale, whereas comparison with theoretical calculations and assessment of instrumental scale distortion require accurate constraints on the measured isotopic compositions of the primary isotopic reference materials (iRMs) themselves. In particular, the measured δ17OVSMOW and Δ′17OVSMOW values for SLAP and its...
Authors
Ryoji Tanaka, Andreas Pack, Tyler B. Coplen
Three new calcium formate reference materials for δ13C measurements and a redetermination of the R(13C/12C) ratio for VPDB based on proton nuclear magnetic resonance measurements Three new calcium formate reference materials for δ13C measurements and a redetermination of the R(13C/12C) ratio for VPDB based on proton nuclear magnetic resonance measurements
Rationale
Authors
David W. Hoffman, Cornelia Rasmussen, Arndt Schimmelmann, Lauren T Reid, Haiping Qi, Tyler B. Coplen
Reaffirming the consistency of the original stock of NBS 19 limestone and its byproduct with finer grain size for δ13C and δ18O calibrations—Both distributed internationally Reaffirming the consistency of the original stock of NBS 19 limestone and its byproduct with finer grain size for δ13C and δ18O calibrations—Both distributed internationally
Rationale
Authors
Haiping Qi, Tyler B. Coplen, Lauren T Reid, Stanley J. Mroczkowski
Correction to “Stable isotope reference materials and scale definitions – outcomes of the 2024 IAEA experts meeting” Correction to “Stable isotope reference materials and scale definitions – outcomes of the 2024 IAEA experts meeting”
This article corrects the following: Camin, F., Besic, D., Brewer, P., Allison, C., Coplen, T., Dunn, P., Gehre, M., Gröning, M., Meijer, H.-A.-J, Hélie, J.-F., Iacumin, P., Kraft, R., Krajnc, B., Kümmel, S., Lee, S., Meija, J., Mester, Z., Mohn, J., Moossen, H., Qi, H., Skrzypek, G., Sperlich, P., Viallon, J., Wassenaar, L. and Wielgosz, R. (2025). Stable Isotope Reference Materials and...
Authors
Federica Camin, D. Besic, P. J. Brewer, C. E Allison, Tyler B. Coplen, P. J. Dunn, M. Gehre, M. Gröning, H.A. J. Meijer, J. F. Hélie, P. Iacumin, R. Kraft, B. Krajnc, S. Kümme, S.S. Lee, J. Meija, Z. Mester, J. Mohn, H. Moossen, Haiping Qi, G. Skrzypek, P. Sperlich, J. Viallon, L. Wassenaar, R. Wielgosz
Isotopic compositions of modern seawater at the Mariana and Yap trenches Isotopic compositions of modern seawater at the Mariana and Yap trenches
The isotopic composition of ocean water is crucial in studying water masses and mixing in deep oceans, isotope mass balance in ocean water regulated by high-temperature and low-temperature hydrothermal alterations, and the exchange of water among crust-ocean-mantle reservoirs. We collected 40 water samples from Challenger Deep and the water column above at the Mariana Trench (down to 10...
Authors
Ying-Tsong Lin, Hongling Pan, Kaiwen Ta, Haiping Qi, Tyler B. Coplen, Amaelle Landais, Nanping Wu
Determination of provenance soil type using inductively coupled plasma mass spectrometry (ICP-MS) analyses of Pinus ponderosa ash Determination of provenance soil type using inductively coupled plasma mass spectrometry (ICP-MS) analyses of Pinus ponderosa ash
This study demonstrates the feasibility of determining soil provenance from tree ash composition using elemental analysis and chemometric techniques. To date, no published studies have applied chemometric approaches to classify ash for provenance determination following forest fires. In this work, Pinus ponderosa ash was analyzed to distinguish samples based on soil type and geographic...
Authors
M. Fernanda Delgado Cornelio, Michael E. Ketterer, James A. Jordan, Tyler B. Coplen, Caelin P. Celani, Helder V. Carneiro, Karl S. Booksh
Stable isotope reference materials and scale definitions – Outcomes of the 2024 IAEA experts meeting Stable isotope reference materials and scale definitions – Outcomes of the 2024 IAEA experts meeting
The participants of the 12th International Atomic Energy Agency (IAEA) meeting on stable isotope reference materials reached a consensus, acknowledging the existence and use of two carbon isotope delta scales: the VPDB (Vienna Peedee belemnite) scale and the VPDB-LSVEC (LSVEC - lithium carbonate prepared by H. J. Svec). Conversion models between the two scales can be established and used...
Authors
Federica Camin, Dinka Besic, Paul J. Brewer, Colin E Allison, Tyler B. Coplen, Philip J.H. Dunn, Matthias Gehre, Manfred Gröning, Harro A.J. Meijer, Jean-François Hélie, Paola Iacumin, Rebecca Kraft, Bor Krajnc, Steffen Kümmel, Sangil Lee, Juris Meija, Zoltan Mester, Joachim Mohn, Heiko Moossen, Haiping Qi, Grzegorz Skrzypek, Peter Sperlich, Joelle Viallon, Leonard I. Wassenaar, Robert I. Wielgosz
Characterization of DOC in riparian wetland pore water and its interference in stable water isotope analysis of δ2H and δ18O Characterization of DOC in riparian wetland pore water and its interference in stable water isotope analysis of δ2H and δ18O
Wetlands play an important role in carbon retention, which is greatly dependent on hydrological conditions. Therefore, the interest in wetland hydrology has increased over recent decades. In wetland hydrology, stable water isotopes (δ2H, δ18O) have found increasing use, as laser-based instruments have become readily available and allow for faster analysis and lower costs. However, the...
Authors
F. Fredriksson, K. T. Martinsen, K.-T. Liao, Tyler B. Coplen, R. Jakobsen, O. Batelaan, S. Jessen
Geographic determination of Pinus ponderosa using DART TOFMS, ICP-MS, and LIBS handheld analyzer Geographic determination of Pinus ponderosa using DART TOFMS, ICP-MS, and LIBS handheld analyzer
Due to legal requirements on international imports, it is important for law enforcement and regulatory agencies to identify the geographical provenance of timber. Current methods for geographic identification utilize data generated by direct analysis in real time time-of-flight mass spectrometry (DART TOFMS), genetics, and isotope-ratio mass spectrometry (IRMS), but identification...
Authors
Erin R. Price, Kierra R. Cano, Caelin P. Celani, Helder V. Carneiro, Karl S. Booksh, James A. Jordan, Pamela J. McClure, Megahn H. Pinedo, Michael E. Ketterer, Kent M. Elliott, Tyler B. Coplen, Edgard O. Espinoza
Using stable oxygen isotope dual-inlet isotope-ratio mass spectrometry to elucidate uranium transport and mixed 230Th/U calcite formation ages at the seminal Devils Hole, Nevada, natural laboratory Using stable oxygen isotope dual-inlet isotope-ratio mass spectrometry to elucidate uranium transport and mixed 230Th/U calcite formation ages at the seminal Devils Hole, Nevada, natural laboratory
Rationale Vein calcite in Devils Hole has been precipitating continuously in oxygen-isotope equilibrium at a constant temperature for over 500 000 years, providing an unmatched δ18O paleoclimate time series. A substantial issue is that coeval calcite (based on matching δ18O values) has uranium-series ages differing by 12 000 years. Methods An unparalleled high-accuracy δ18O chronology...
Authors
Tyler B. Coplen, Robert R. Seal,, Lauren T Reid, James A. Jordan, Adam C. Mumford
Evaluation of spectral collection strategies for identification of Dalbergia spp. using handheld laser-induced breakdown spectroscopy Evaluation of spectral collection strategies for identification of Dalbergia spp. using handheld laser-induced breakdown spectroscopy
The illegal timber trade has significant impact on the survival of endangered tropical hardwood species like Dalbergia spp. (rosewood), a world-wide protected genus from the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). Due to increased threat to Dalbergia spp., and lack of action to reduce threats, port of entry analysis methods are required to...
Authors
Caelin P. Celani, Rachel A McCormick, Amelia M Speed, William Johnston, James A. Jordan, Tyler B. Coplen, Karl S. Booksh
Equilibrated gas and carbonate standard-derived dual (Δ47 and Δ48) clumped isotope values Equilibrated gas and carbonate standard-derived dual (Δ47 and Δ48) clumped isotope values
Carbonate clumped isotope geochemistry has primarily focused on mass spectrometric determination of m/z 47 CO2 for geothermometry, but theoretical calculations and recent experiments indicate paired analysis of the m/z 47 (13C18O16O) and m/z 48 (12C18O18O) isotopologues (referred to as Δ47 and Δ48) can be used to study non-equilibrium isotope fractionations and refine temperature...
Authors
Jamie K Lucarelli, Hannah M. Carroll, Robert N. Ulrich, Ben M. Elliott, Tyler B. Coplen, Robert A. Eagle, Aradhna K. Tripati
Science and Products
Filter Total Items: 21
Stable isotopic compositions of volatile organic compound reference materials USGS96-105 measured at the U.S. Geological Survey Reston Stable Isotope Laboratory (RSIL), 2024–2025 Stable isotopic compositions of volatile organic compound reference materials USGS96-105 measured at the U.S. Geological Survey Reston Stable Isotope Laboratory (RSIL), 2024–2025
Ten volatile organic compound matrix reference materials (RMs) were analyzed for hydrogen, carbon, nitrogen, oxygen, and sulfur stable isotopic compositions at the Reston Stable Isotope Laboratory (RSIL) of the U.S. Geological Survey from 2024-2025. The RMs are acetonitrile, benzaldehyde, bis(methylthio)methane, dimethylsulfide, ethyl 2-methylbutyrate, furfural, 2-methyl-1-butanol, 1...
Measurements of concentration, fluorescence, and absorbance characteristics of DOC and stable hydrogen and oxygen isotope analysis of pore water from riparian wetlands in Denmark from September 2022 to October 2023 Measurements of concentration, fluorescence, and absorbance characteristics of DOC and stable hydrogen and oxygen isotope analysis of pore water from riparian wetlands in Denmark from September 2022 to October 2023
Wetlands play an important role in carbon retention, which is greatly dependent on hydrological conditions. Therefore, the interest in wetland hydrology has increased over recent decades. In wetland hydrology, stable water isotopes (δ2H, δ18O) have found increasing use, as laser-based instruments have become readily available and allow for faster analysis and lower costs. However, the...
Carbon and oxygen isotopic compositions of NBS 19 limestone isotopic reference material and its byproduct calcite having finer grain size, measured at the U.S. Geological Survey Reston Stable Isotope Laboratory (RSIL), 2025 Carbon and oxygen isotopic compositions of NBS 19 limestone isotopic reference material and its byproduct calcite having finer grain size, measured at the U.S. Geological Survey Reston Stable Isotope Laboratory (RSIL), 2025
Approximately 3 to 4 kg of NBS 19 limestone, prepared in 1982 by the U.S. Geological Survey (USGS), serves as a primary reference for the carbon isotope scales VPDB and VPDB-LSVEC and the oxygen isotope scale VPDB. Its consensus values are +1.95 ‰ for δ¹³C and –2.2 ‰ for δ¹⁸O measurements. After more than three decades of distribution, the number of units labeled “NBS 19” shrunk...
ICP-MS measurements and R Code to determine provenance soil type from analyses of Pinus ponderosa ash collected in Arizona and Colorado ICP-MS measurements and R Code to determine provenance soil type from analyses of Pinus ponderosa ash collected in Arizona and Colorado
Needle samples from 140 Pinus ponderosa were analyzed for trace elements via inductively coupled plasma mass spectrometry (ICP-MS). Samples were collected from eight locations representing five distinct soil types across the Colorado Plateau near Flagstaff, Arizona and Boulder, Colorado. Data includes a full spectral scan between m/z 5-245 which was condensed to 72 dominant atomic masses
Stable hydrogen and oxygen isotopic composition of surface and groundwater samples from central and eastern Washington, USA Stable hydrogen and oxygen isotopic composition of surface and groundwater samples from central and eastern Washington, USA
In this data release, hydrogen-2 and oxygen-18 isotope ratios are presented for 158 unique sites in central and eastern Washington. There are 16 unique surface water sites with a total of 140 samples, and 142 groundwater sites with a total of 167 samples. Sample dates range from February 1993 to February 2021. Stable isotope analysis of water utilizes slight differences in the mass of...
Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Virginia and West Virginia National Atmospheric Deposition Program (NADP) sites Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Virginia and West Virginia National Atmospheric Deposition Program (NADP) sites
The stable hydrogen (delta 2H) and oxygen (delta 18O) isotopic compositions of more than 1,400 daily or weekly composite samples of precipitation from four National Atmospheric Deposition Program (NADP) sites (VA10, VA27, VA28, and WV99) in Virginia and West Virginia were analyzed on archived samples obtained from NADP over various time periods from as early as 1998. The samples are from...
Tables and figures for the unrecognized role of uranium transport in the Devils Hole, Nevada climate record Tables and figures for the unrecognized role of uranium transport in the Devils Hole, Nevada climate record
For more than a half million years, dense vein calcite has been precipitating in Devils Hole, located about 115 km northwest of Las Vegas, Nevada. This process also occurs in Devils Hole Cave 2, which is hydrologically connected and situated about 200 meters north of the original Devils Hole cave. Calcite has been precipitating in this natural laboratory in oxygen isotopic equilibrium at...
Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Colorado and Utah National Atmospheric Deposition Program (NADP) sites Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Colorado and Utah National Atmospheric Deposition Program (NADP) sites
The stable hydrogen (delta 2H) and oxygen (delta 18O) isotopic compositions of more than 4,300 weekly composite samples of precipitation from thirteen National Atmospheric Deposition Program (NADP) sites (CO02, CO08, CO09, CO10, CO21, CO89, CO91, CO92, CO93, CO96, CO97, CO98, and UT09) in Colorado and Utah were analyzed on archived samples obtained from NADP over various time periods...
Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Delaware, Maryland, New Jersey, New York, and Pennsylvania National Atmospheric Deposition Program (NADP) sites Stable hydrogen and oxygen isotopic compositions of precipitation samples from selected Delaware, Maryland, New Jersey, New York, and Pennsylvania National Atmospheric Deposition Program (NADP) sites
The stable hydrogen (delta 2H) and oxygen (delta 18O) isotopic compositions of more than 6,400 daily or weekly composite samples of precipitation from nine National Atmospheric Deposition Program (NADP) sites (DE02, MD07, NJ99, NY67, NY68, PA00, PA15, PA72, and PA98) in New York, New Jersey, Delaware, Maryland and Pennsylvania were analyzed on archived samples obtained from NADP over...
Chemical and isotopic compositions of tropical wood samples Chemical and isotopic compositions of tropical wood samples
Illegal logging is one of the leading causes of deforestation today. Sadly, tree species indigenous to regions critical to maintaining Earth?s ecological diversity also possess properties (i.e. appearance, aroma, etc.) desirable to humans, which often leads to exploitation. In 1992, due to illegal logging, Brazilian rosewood (Dalbergia nigra) became the first ever tree species to be...
USGS46a Greenland ice core water ? A reference material for stable hydrogen and oxygen isotopic composition of water USGS46a Greenland ice core water ? A reference material for stable hydrogen and oxygen isotopic composition of water
Ice core from Greenland was melted, filtered, and homogenized. Its stable hydrogen (δ2H) and oxygen (δ18O) isotopic compositions were adjusted to approximately match those of USGS46 ice core water (δ2H = ?235.8 ? and δ18O = ?29.80 ?). This isotopic reference water, USGS46a, was loaded into glass ampules, sealed, autoclaved to eliminate biological activity, and calibrated by dual-inlet...
Data on Produced Water Quality and Quantities from Hydraulically Fractured Williston Basin Oil Wells Data on Produced Water Quality and Quantities from Hydraulically Fractured Williston Basin Oil Wells
This dataset contains compositional data on 17 produced water samples from hydraulically fractured unconventional oil wells completed in the Middle Bakken and Three Forks Formations. The oil wells are located in five different wellfields across the Williston Basin. Specific gravity, conductivity, temperature, pH and oxidation-reduction potential for each sample was measured in the field...
Filter Total Items: 162
Triple oxygen isotope compositions of isotopic reference waters: Implications for VSMOW-Scale and VSMOW-SLAP-Scale Δ′¹⁷O calibration Triple oxygen isotope compositions of isotopic reference waters: Implications for VSMOW-Scale and VSMOW-SLAP-Scale Δ′¹⁷O calibration
Triple oxygen isotope ratios of waters are commonly reported on the VSMOW–SLAP scale, whereas comparison with theoretical calculations and assessment of instrumental scale distortion require accurate constraints on the measured isotopic compositions of the primary isotopic reference materials (iRMs) themselves. In particular, the measured δ17OVSMOW and Δ′17OVSMOW values for SLAP and its...
Authors
Ryoji Tanaka, Andreas Pack, Tyler B. Coplen
Three new calcium formate reference materials for δ13C measurements and a redetermination of the R(13C/12C) ratio for VPDB based on proton nuclear magnetic resonance measurements Three new calcium formate reference materials for δ13C measurements and a redetermination of the R(13C/12C) ratio for VPDB based on proton nuclear magnetic resonance measurements
Rationale
Authors
David W. Hoffman, Cornelia Rasmussen, Arndt Schimmelmann, Lauren T Reid, Haiping Qi, Tyler B. Coplen
Reaffirming the consistency of the original stock of NBS 19 limestone and its byproduct with finer grain size for δ13C and δ18O calibrations—Both distributed internationally Reaffirming the consistency of the original stock of NBS 19 limestone and its byproduct with finer grain size for δ13C and δ18O calibrations—Both distributed internationally
Rationale
Authors
Haiping Qi, Tyler B. Coplen, Lauren T Reid, Stanley J. Mroczkowski
Correction to “Stable isotope reference materials and scale definitions – outcomes of the 2024 IAEA experts meeting” Correction to “Stable isotope reference materials and scale definitions – outcomes of the 2024 IAEA experts meeting”
This article corrects the following: Camin, F., Besic, D., Brewer, P., Allison, C., Coplen, T., Dunn, P., Gehre, M., Gröning, M., Meijer, H.-A.-J, Hélie, J.-F., Iacumin, P., Kraft, R., Krajnc, B., Kümmel, S., Lee, S., Meija, J., Mester, Z., Mohn, J., Moossen, H., Qi, H., Skrzypek, G., Sperlich, P., Viallon, J., Wassenaar, L. and Wielgosz, R. (2025). Stable Isotope Reference Materials and...
Authors
Federica Camin, D. Besic, P. J. Brewer, C. E Allison, Tyler B. Coplen, P. J. Dunn, M. Gehre, M. Gröning, H.A. J. Meijer, J. F. Hélie, P. Iacumin, R. Kraft, B. Krajnc, S. Kümme, S.S. Lee, J. Meija, Z. Mester, J. Mohn, H. Moossen, Haiping Qi, G. Skrzypek, P. Sperlich, J. Viallon, L. Wassenaar, R. Wielgosz
Isotopic compositions of modern seawater at the Mariana and Yap trenches Isotopic compositions of modern seawater at the Mariana and Yap trenches
The isotopic composition of ocean water is crucial in studying water masses and mixing in deep oceans, isotope mass balance in ocean water regulated by high-temperature and low-temperature hydrothermal alterations, and the exchange of water among crust-ocean-mantle reservoirs. We collected 40 water samples from Challenger Deep and the water column above at the Mariana Trench (down to 10...
Authors
Ying-Tsong Lin, Hongling Pan, Kaiwen Ta, Haiping Qi, Tyler B. Coplen, Amaelle Landais, Nanping Wu
Determination of provenance soil type using inductively coupled plasma mass spectrometry (ICP-MS) analyses of Pinus ponderosa ash Determination of provenance soil type using inductively coupled plasma mass spectrometry (ICP-MS) analyses of Pinus ponderosa ash
This study demonstrates the feasibility of determining soil provenance from tree ash composition using elemental analysis and chemometric techniques. To date, no published studies have applied chemometric approaches to classify ash for provenance determination following forest fires. In this work, Pinus ponderosa ash was analyzed to distinguish samples based on soil type and geographic...
Authors
M. Fernanda Delgado Cornelio, Michael E. Ketterer, James A. Jordan, Tyler B. Coplen, Caelin P. Celani, Helder V. Carneiro, Karl S. Booksh
Stable isotope reference materials and scale definitions – Outcomes of the 2024 IAEA experts meeting Stable isotope reference materials and scale definitions – Outcomes of the 2024 IAEA experts meeting
The participants of the 12th International Atomic Energy Agency (IAEA) meeting on stable isotope reference materials reached a consensus, acknowledging the existence and use of two carbon isotope delta scales: the VPDB (Vienna Peedee belemnite) scale and the VPDB-LSVEC (LSVEC - lithium carbonate prepared by H. J. Svec). Conversion models between the two scales can be established and used...
Authors
Federica Camin, Dinka Besic, Paul J. Brewer, Colin E Allison, Tyler B. Coplen, Philip J.H. Dunn, Matthias Gehre, Manfred Gröning, Harro A.J. Meijer, Jean-François Hélie, Paola Iacumin, Rebecca Kraft, Bor Krajnc, Steffen Kümmel, Sangil Lee, Juris Meija, Zoltan Mester, Joachim Mohn, Heiko Moossen, Haiping Qi, Grzegorz Skrzypek, Peter Sperlich, Joelle Viallon, Leonard I. Wassenaar, Robert I. Wielgosz
Characterization of DOC in riparian wetland pore water and its interference in stable water isotope analysis of δ2H and δ18O Characterization of DOC in riparian wetland pore water and its interference in stable water isotope analysis of δ2H and δ18O
Wetlands play an important role in carbon retention, which is greatly dependent on hydrological conditions. Therefore, the interest in wetland hydrology has increased over recent decades. In wetland hydrology, stable water isotopes (δ2H, δ18O) have found increasing use, as laser-based instruments have become readily available and allow for faster analysis and lower costs. However, the...
Authors
F. Fredriksson, K. T. Martinsen, K.-T. Liao, Tyler B. Coplen, R. Jakobsen, O. Batelaan, S. Jessen
Geographic determination of Pinus ponderosa using DART TOFMS, ICP-MS, and LIBS handheld analyzer Geographic determination of Pinus ponderosa using DART TOFMS, ICP-MS, and LIBS handheld analyzer
Due to legal requirements on international imports, it is important for law enforcement and regulatory agencies to identify the geographical provenance of timber. Current methods for geographic identification utilize data generated by direct analysis in real time time-of-flight mass spectrometry (DART TOFMS), genetics, and isotope-ratio mass spectrometry (IRMS), but identification...
Authors
Erin R. Price, Kierra R. Cano, Caelin P. Celani, Helder V. Carneiro, Karl S. Booksh, James A. Jordan, Pamela J. McClure, Megahn H. Pinedo, Michael E. Ketterer, Kent M. Elliott, Tyler B. Coplen, Edgard O. Espinoza
Using stable oxygen isotope dual-inlet isotope-ratio mass spectrometry to elucidate uranium transport and mixed 230Th/U calcite formation ages at the seminal Devils Hole, Nevada, natural laboratory Using stable oxygen isotope dual-inlet isotope-ratio mass spectrometry to elucidate uranium transport and mixed 230Th/U calcite formation ages at the seminal Devils Hole, Nevada, natural laboratory
Rationale Vein calcite in Devils Hole has been precipitating continuously in oxygen-isotope equilibrium at a constant temperature for over 500 000 years, providing an unmatched δ18O paleoclimate time series. A substantial issue is that coeval calcite (based on matching δ18O values) has uranium-series ages differing by 12 000 years. Methods An unparalleled high-accuracy δ18O chronology...
Authors
Tyler B. Coplen, Robert R. Seal,, Lauren T Reid, James A. Jordan, Adam C. Mumford
Evaluation of spectral collection strategies for identification of Dalbergia spp. using handheld laser-induced breakdown spectroscopy Evaluation of spectral collection strategies for identification of Dalbergia spp. using handheld laser-induced breakdown spectroscopy
The illegal timber trade has significant impact on the survival of endangered tropical hardwood species like Dalbergia spp. (rosewood), a world-wide protected genus from the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). Due to increased threat to Dalbergia spp., and lack of action to reduce threats, port of entry analysis methods are required to...
Authors
Caelin P. Celani, Rachel A McCormick, Amelia M Speed, William Johnston, James A. Jordan, Tyler B. Coplen, Karl S. Booksh
Equilibrated gas and carbonate standard-derived dual (Δ47 and Δ48) clumped isotope values Equilibrated gas and carbonate standard-derived dual (Δ47 and Δ48) clumped isotope values
Carbonate clumped isotope geochemistry has primarily focused on mass spectrometric determination of m/z 47 CO2 for geothermometry, but theoretical calculations and recent experiments indicate paired analysis of the m/z 47 (13C18O16O) and m/z 48 (12C18O18O) isotopologues (referred to as Δ47 and Δ48) can be used to study non-equilibrium isotope fractionations and refine temperature...
Authors
Jamie K Lucarelli, Hannah M. Carroll, Robert N. Ulrich, Ben M. Elliott, Tyler B. Coplen, Robert A. Eagle, Aradhna K. Tripati
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