Arid
DOI10.1002/rcm.3832
Effects of nitrate and water on the oxygen isotopic analysis of barium sulfate precipitated from water samples
Hannon, Janet E.; Boehlke, John Karl; Mroczkowski, Stanley J.
通讯作者Boehlke, John Karl
来源期刊RAPID COMMUNICATIONS IN MASS SPECTROMETRY
ISSN0951-4198
EISSN1097-0231
出版年2008
卷号22期号:24页码:4109-4120
英文摘要

BaSO4 precipitated from mixed salt solutions by common techniques for SO42- isotopic analysis may contain quantities of H2O and NO3- that introduce errors in 0 isotope measurements. Experiments with synthetic solutions indicate that delta O-18 values of CO produced by decomposition of precipitated BaSO4 in a carbon reactor may be either too low or too high, depending on the relative concentrations of SO42- and NO3- and the delta O-18 values of the H2O, NO3-, and SO42-. Typical delta O-18 errors are of the order of 0.5 to 1 parts per thousand. in many sample types, and can be larger in samples containing atmospheric NO3-, which can cause similar errors in delta O-17 and Delta O-17. These errors can be reduced by (1) ion chromatographic separation of SO42- from NO3-, (2) increasing the salinity of the solutions before precipitating BaSO4 to minimize incorporation of H2O, (3) heating BaSO4 under vacuum to remove H2O, (4) preparing isotopic reference materials as aqueous samples to mimic the conditions of the samples, and (5) adjusting measured delta O-18 values based on amounts and isotopic compositions of coexisting H2O and NO3-. These procedures are demonstrated for SO42- isotopic reference materials, synthetic solutions with isotopically known reagents, atmospheric deposition from Shenandoah National Park, Virginia, USA, and sulfate salt deposits from the Atacama Desert, Chile, and Mojave Desert, California, USA. These results have implications for the calibration and use of 0 isotope data in studies of SO42- sources and reaction mechanisms. Published in 2008 by John Wiley & Sons, Ltd.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000262293100018
WOS关键词FRESH-WATER ; SULFUR ; STANDARDIZATION ; DENITRIFICATION ; CALIBRATION ; COLLECTION ; DELTA-N-15 ; DEPOSITS ; DESERT ; CHILE
WOS类目Biochemical Research Methods ; Chemistry, Analytical ; Spectroscopy
WOS研究方向Biochemistry & Molecular Biology ; Chemistry ; Spectroscopy
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/159031
作者单位US Geol Survey, Reston, VA 20192 USA
推荐引用方式
GB/T 7714
Hannon, Janet E.,Boehlke, John Karl,Mroczkowski, Stanley J.. Effects of nitrate and water on the oxygen isotopic analysis of barium sulfate precipitated from water samples[J]. United States Geological Survey,2008,22(24):4109-4120.
APA Hannon, Janet E.,Boehlke, John Karl,&Mroczkowski, Stanley J..(2008).Effects of nitrate and water on the oxygen isotopic analysis of barium sulfate precipitated from water samples.RAPID COMMUNICATIONS IN MASS SPECTROMETRY,22(24),4109-4120.
MLA Hannon, Janet E.,et al."Effects of nitrate and water on the oxygen isotopic analysis of barium sulfate precipitated from water samples".RAPID COMMUNICATIONS IN MASS SPECTROMETRY 22.24(2008):4109-4120.
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