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Title: The Application and Potential Artifacts of Zeeman Cold Vapor Atomic Absorption Spectrometry in Mercury Stable Isotope Analysis

Abstract

Zeeman cold vapor atomic absorption spectrometry (CVAAS) has been widely used for environmental mercury (Hg) detection and quantification for decades, but little is known about its utility and potential artifacts in analyzing Hg with varying isotope compositions. We show that each Hg isotope responds differently by CVAAS analysis, with 200Hg and 202Hg isotopes exhibiting signal intensities ~10 times greater than those of 198Hg and 201Hg isotopes. However, all Hg isotopes show a linear correlation between Hg concentration and signal intensity, validated by both measurements and theoretical simulations. Zeeman CVAAS could thus offer a convenient, inexpensive tool for determining Hg isotopes, particularly in using one or two enriched Hg isotopes for tracing Hg biogeochemical transformations, such as partitioning, ion exchange, sorption–desorption, and methylation–demethylation in environmental matrices. Additionally, we caution that care must be taken when CVAAS is used for quantifying Hg in samples with changing isotope compositions to avoid measurement errors.

Authors:
ORCiD logo [1];  [2];  [3];  [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [4]
  1. Lanzhou Univ., Lanzhou (China); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  2. Lanzhou Univ., Lanzhou (China)
  3. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1502555
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Environmental Science & Technology Letters (Online)
Additional Journal Information:
Journal Name: Environmental Science & Technology Letters (Online); Journal Volume: 6; Journal Issue: 3; Journal ID: ISSN 2328-8930
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Lu, Xia, Zhao, Jiangtao, Liang, Xujun, Zhang, Lijie, Liu, Yurong, Yin, Xiangping, Li, Xiangkai, and Gu, Baohua. The Application and Potential Artifacts of Zeeman Cold Vapor Atomic Absorption Spectrometry in Mercury Stable Isotope Analysis. United States: N. p., 2019. Web. doi:10.1021/acs.estlett.9b00067.
Lu, Xia, Zhao, Jiangtao, Liang, Xujun, Zhang, Lijie, Liu, Yurong, Yin, Xiangping, Li, Xiangkai, & Gu, Baohua. The Application and Potential Artifacts of Zeeman Cold Vapor Atomic Absorption Spectrometry in Mercury Stable Isotope Analysis. United States. doi:10.1021/acs.estlett.9b00067.
Lu, Xia, Zhao, Jiangtao, Liang, Xujun, Zhang, Lijie, Liu, Yurong, Yin, Xiangping, Li, Xiangkai, and Gu, Baohua. Thu . "The Application and Potential Artifacts of Zeeman Cold Vapor Atomic Absorption Spectrometry in Mercury Stable Isotope Analysis". United States. doi:10.1021/acs.estlett.9b00067.
@article{osti_1502555,
title = {The Application and Potential Artifacts of Zeeman Cold Vapor Atomic Absorption Spectrometry in Mercury Stable Isotope Analysis},
author = {Lu, Xia and Zhao, Jiangtao and Liang, Xujun and Zhang, Lijie and Liu, Yurong and Yin, Xiangping and Li, Xiangkai and Gu, Baohua},
abstractNote = {Zeeman cold vapor atomic absorption spectrometry (CVAAS) has been widely used for environmental mercury (Hg) detection and quantification for decades, but little is known about its utility and potential artifacts in analyzing Hg with varying isotope compositions. We show that each Hg isotope responds differently by CVAAS analysis, with 200Hg and 202Hg isotopes exhibiting signal intensities ~10 times greater than those of 198Hg and 201Hg isotopes. However, all Hg isotopes show a linear correlation between Hg concentration and signal intensity, validated by both measurements and theoretical simulations. Zeeman CVAAS could thus offer a convenient, inexpensive tool for determining Hg isotopes, particularly in using one or two enriched Hg isotopes for tracing Hg biogeochemical transformations, such as partitioning, ion exchange, sorption–desorption, and methylation–demethylation in environmental matrices. Additionally, we caution that care must be taken when CVAAS is used for quantifying Hg in samples with changing isotope compositions to avoid measurement errors.},
doi = {10.1021/acs.estlett.9b00067},
journal = {Environmental Science & Technology Letters (Online)},
number = 3,
volume = 6,
place = {United States},
year = {2019},
month = {2}
}

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This content will become publicly available on February 7, 2020
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