Haiping Qi
Haiping Qi is a Chemist with the USGS Reston Stable Isotope Laboratory.
B.S (Chemical Engineering), Tianjin University of Science and Technology, Tianjin, China. 1978 - 1982.
Research Chemist, Institute of Salt Lakes, Chinese Academy of Science, Qinghai, China. 1982 - 1993.
Visiting Scholar, Institute for Reference Material and Measurements (IRMM), Joint Research Center of European Commission, Geel, Belgium. 1993 - 1994 and 1995 - 1996.
Visiting Scholar, Reston Stable Isotope laboratory, USGS, VA. 1996 - 1998.
Isotope Laboratory assistant manager, Reston Stable Isotope laboratory, USGS, VA. 1998 - present
Science and Products
Filter Total Items: 23
Lake Louise Water (USGS47): A new isotopic reference water for stable hydrogen and oxygen isotope measurements
"RATIONALE: Because of the paucity of isotopic reference waters for daily use, a new secondary isotopic reference material has been prepared from Lake Louise water from Alberta, Canada for international distribution.
MOTHODS: This water was filtered, homogenized, loaded into glass ampoules, sealed with a torch, autoclaved to eliminate biological activity, and measured by dual-inlet isotope-ratio
Authors
Haiping Qi, Jennifer M. Lorenz, Tyler B. Coplen, Lauren V. Tarbox, Bernhard Mayer, Steve Taylor
USGS48 Puerto Rico precipitation - A new isotopic reference material for δ2H and δ18O measurements of water
A new secondary isotopic reference material has been prepared from Puerto Rico precipitation, which was filtered, homogenised, loaded into glass ampoules, sealed with a torch, autoclaved to eliminate biological activity, and calibrated by dual-inlet isotope-ratio mass spectrometry. This isotopic reference material, designated as USGS48, is intended to be one of two isotopic reference waters for da
Authors
Haiping Qi, Tyler B. Coplen, Lauren V. Tarbox, Jennifer M. Lorenz, Martha A. Scholl
USGS42 and USGS43: Human-hair stable hydrogen and oxygen isotopic reference materials and analytical methods for forensic science and implications for published measurement results
Because there are no internationally distributed stable hydrogen and oxygen isotopic reference materials of human hair, the U.S. Geological Survey (USGS) has prepared two such materials, USGS42 and USGS43. These reference materials span values commonly encountered in human hair stable isotope analysis and are isotopically homogeneous at sample sizes larger than 0.2 mg. USGS42 and USGS43 human-hair
Authors
T. B. Coplen, H. Qi
Investigation of preparation techniques for δ2H analysis of keratin materials and a proposed analytical protocol
Accurate hydrogen isotopic measurements of keratin materials have been a challenge due to exchangeable hydrogen in the sample matrix and the paucity of appropriate isotopic reference materials for calibration. We found that the most reproducible δ2HVSMOW-SLAP and mole fraction of exchangeable hydrogen, x(H)ex, of keratin materials were measured with equilibration at ambient temperature using two d
Authors
H. Qi, T. B. Coplen
Caution on the use of liquid nitrogen traps in stable hydrogen isotope-ratio mass spectrometry
An anomalous stable hydrogen isotopic fractionation of 4 ‰ in gaseous hydrogen has been correlated with the process of adding liquid nitrogen (LN2) to top off the dewar of a stainless-steel water trap on a gaseous hydrogen-water platinum equilibration system. Although the cause of this isotopic fractionation is unknown, its effect can be mitigated by (1) increasing the capacity of any dewars so th
Authors
Tyler B. Coplen, Haiping Qi
Applying the silver-tube introduction method for thermal conversion elemental analyses and a new δ2H value for NBS 22 oil
The δ2HVSMOW–SLAP value of total hydrogen of the international measurement standard NBS 22 oil was determined by a new method of sealing water in silver tubes for use in a thermal conversion elemental analysis (TC/EA) reduction unit. The isotopic fractionation of water due to evaporation is virtually non-existent in this silver-tube method. A new value for the δ2HVSMOW–SLAP of NBS 22 oil, calibrat
Authors
Tyler B. Coplen, Haiping Qi
Novel silver tubing method for quantitative introduction of water into high temperature conversion systems for stable hydrogen and oxygen isotopic measurements
A new method to seal water in silver tubes for use in a TC/EA reduction unit using a semi-automated sealing apparatus can yield reproducibilities (1 standard deviation) of δ2H and &delta18O measurements of 1.0 ‰ and 0.06 ‰, respectively. These silver tubes containing reference waters may be preferred for calibration of H- and O-bearing materials analyzed with a TC/EA reduction unit. The new sealin
Authors
Haiping Qi, Manfred Groning, Tyler B. Coplen, Bryan Buck, Stanley J. Mroczkowski, Willi A. Brand, Heike Geilmann, Matthias Gehre
Quality assurance and quality control in light stable isotope laboratories: A case study of Rio Grande, Texas, water samples
New isotope laboratories can achieve the goal of reporting the same isotopic composition within analytical uncertainty for the same material analysed decades apart by (1) writing their own acceptance testing procedures and putting them into their mass spectrometric or laser-based isotope-ratio equipment procurement contract, (2) requiring a manufacturer to demonstrate acceptable performance using
Authors
T. B. Coplen, H. Qi
Nicotine, acetanilide and urea multi-level2H-,13C- and15N-abundance reference materials for continuous-flow isotope ratio mass spectrometry
Accurate determinations of stable isotope ratios require a calibration using at least two reference materials with different isotopic compositions to anchor the isotopic scale and compensate for differences in machine slope. Ideally, the S values of these reference materials should bracket the isotopic range of samples with unknown S values. While the practice of analyzing two isotopically distinc
Authors
A. Schimmelmann, A. Albertino, P.E. Sauer, H. Qi, R. Molinie, F. Mesnard
Two new organic reference materials for δ13C and δ15N measurements and a new value for the δ13C of NBS 22 oil
Analytical grade L-glutamic acid is chemically stable and has a C/N mole ratio of 5, which is close to that of many of natural biological materials, such as blood and animal tissue. Two L-glutamic acid reference materials with substantially different 13C and 15N abundances have been prepared for use as organic reference materials for C and N isotopic measurements. USGS40 is analytical grade L-glut
Authors
Haiping Qi, Tyler B. Coplen, Heike Geilmann, Willi A. Brand, J.K. Böhlke
Evaluation of the 34S/32S ratio of Soufre de Lacq elemental sulfur isotopic reference material by continuous flow isotope-ratio mass spectrometry
Soufre de Lacq elemental sulfur reference material (IAEA-S-4) isotopically is homogeneous in amounts as small as 41 ??g as determined by continuous flow isotope-ratio mass spectrometry. The ??34S value for this reference material is +16.90 ?? 0.12??? (1??) on a scale (Vienna Can??on Diablo troilite, VCDT) where IAEA-S-1 Ag2S is -0.3??? and IAEA-S-2 Ag2S is +22.67???. Published by Elsevier Science
Authors
H. P. Qi, T. B. Coplen
Science and Products
Filter Total Items: 23
Lake Louise Water (USGS47): A new isotopic reference water for stable hydrogen and oxygen isotope measurements
"RATIONALE: Because of the paucity of isotopic reference waters for daily use, a new secondary isotopic reference material has been prepared from Lake Louise water from Alberta, Canada for international distribution.
MOTHODS: This water was filtered, homogenized, loaded into glass ampoules, sealed with a torch, autoclaved to eliminate biological activity, and measured by dual-inlet isotope-ratio
Authors
Haiping Qi, Jennifer M. Lorenz, Tyler B. Coplen, Lauren V. Tarbox, Bernhard Mayer, Steve Taylor
USGS48 Puerto Rico precipitation - A new isotopic reference material for δ2H and δ18O measurements of water
A new secondary isotopic reference material has been prepared from Puerto Rico precipitation, which was filtered, homogenised, loaded into glass ampoules, sealed with a torch, autoclaved to eliminate biological activity, and calibrated by dual-inlet isotope-ratio mass spectrometry. This isotopic reference material, designated as USGS48, is intended to be one of two isotopic reference waters for da
Authors
Haiping Qi, Tyler B. Coplen, Lauren V. Tarbox, Jennifer M. Lorenz, Martha A. Scholl
USGS42 and USGS43: Human-hair stable hydrogen and oxygen isotopic reference materials and analytical methods for forensic science and implications for published measurement results
Because there are no internationally distributed stable hydrogen and oxygen isotopic reference materials of human hair, the U.S. Geological Survey (USGS) has prepared two such materials, USGS42 and USGS43. These reference materials span values commonly encountered in human hair stable isotope analysis and are isotopically homogeneous at sample sizes larger than 0.2 mg. USGS42 and USGS43 human-hair
Authors
T. B. Coplen, H. Qi
Investigation of preparation techniques for δ2H analysis of keratin materials and a proposed analytical protocol
Accurate hydrogen isotopic measurements of keratin materials have been a challenge due to exchangeable hydrogen in the sample matrix and the paucity of appropriate isotopic reference materials for calibration. We found that the most reproducible δ2HVSMOW-SLAP and mole fraction of exchangeable hydrogen, x(H)ex, of keratin materials were measured with equilibration at ambient temperature using two d
Authors
H. Qi, T. B. Coplen
Caution on the use of liquid nitrogen traps in stable hydrogen isotope-ratio mass spectrometry
An anomalous stable hydrogen isotopic fractionation of 4 ‰ in gaseous hydrogen has been correlated with the process of adding liquid nitrogen (LN2) to top off the dewar of a stainless-steel water trap on a gaseous hydrogen-water platinum equilibration system. Although the cause of this isotopic fractionation is unknown, its effect can be mitigated by (1) increasing the capacity of any dewars so th
Authors
Tyler B. Coplen, Haiping Qi
Applying the silver-tube introduction method for thermal conversion elemental analyses and a new δ2H value for NBS 22 oil
The δ2HVSMOW–SLAP value of total hydrogen of the international measurement standard NBS 22 oil was determined by a new method of sealing water in silver tubes for use in a thermal conversion elemental analysis (TC/EA) reduction unit. The isotopic fractionation of water due to evaporation is virtually non-existent in this silver-tube method. A new value for the δ2HVSMOW–SLAP of NBS 22 oil, calibrat
Authors
Tyler B. Coplen, Haiping Qi
Novel silver tubing method for quantitative introduction of water into high temperature conversion systems for stable hydrogen and oxygen isotopic measurements
A new method to seal water in silver tubes for use in a TC/EA reduction unit using a semi-automated sealing apparatus can yield reproducibilities (1 standard deviation) of δ2H and &delta18O measurements of 1.0 ‰ and 0.06 ‰, respectively. These silver tubes containing reference waters may be preferred for calibration of H- and O-bearing materials analyzed with a TC/EA reduction unit. The new sealin
Authors
Haiping Qi, Manfred Groning, Tyler B. Coplen, Bryan Buck, Stanley J. Mroczkowski, Willi A. Brand, Heike Geilmann, Matthias Gehre
Quality assurance and quality control in light stable isotope laboratories: A case study of Rio Grande, Texas, water samples
New isotope laboratories can achieve the goal of reporting the same isotopic composition within analytical uncertainty for the same material analysed decades apart by (1) writing their own acceptance testing procedures and putting them into their mass spectrometric or laser-based isotope-ratio equipment procurement contract, (2) requiring a manufacturer to demonstrate acceptable performance using
Authors
T. B. Coplen, H. Qi
Nicotine, acetanilide and urea multi-level2H-,13C- and15N-abundance reference materials for continuous-flow isotope ratio mass spectrometry
Accurate determinations of stable isotope ratios require a calibration using at least two reference materials with different isotopic compositions to anchor the isotopic scale and compensate for differences in machine slope. Ideally, the S values of these reference materials should bracket the isotopic range of samples with unknown S values. While the practice of analyzing two isotopically distinc
Authors
A. Schimmelmann, A. Albertino, P.E. Sauer, H. Qi, R. Molinie, F. Mesnard
Two new organic reference materials for δ13C and δ15N measurements and a new value for the δ13C of NBS 22 oil
Analytical grade L-glutamic acid is chemically stable and has a C/N mole ratio of 5, which is close to that of many of natural biological materials, such as blood and animal tissue. Two L-glutamic acid reference materials with substantially different 13C and 15N abundances have been prepared for use as organic reference materials for C and N isotopic measurements. USGS40 is analytical grade L-glut
Authors
Haiping Qi, Tyler B. Coplen, Heike Geilmann, Willi A. Brand, J.K. Böhlke
Evaluation of the 34S/32S ratio of Soufre de Lacq elemental sulfur isotopic reference material by continuous flow isotope-ratio mass spectrometry
Soufre de Lacq elemental sulfur reference material (IAEA-S-4) isotopically is homogeneous in amounts as small as 41 ??g as determined by continuous flow isotope-ratio mass spectrometry. The ??34S value for this reference material is +16.90 ?? 0.12??? (1??) on a scale (Vienna Can??on Diablo troilite, VCDT) where IAEA-S-1 Ag2S is -0.3??? and IAEA-S-2 Ag2S is +22.67???. Published by Elsevier Science
Authors
H. P. Qi, T. B. Coplen