Quantitative and qualitative trapping of arsines deployed to assess loss of volatile arsenic from paddy soil

Environmental Science & Technology
Adrien MestrotAndrew A Meharg

Abstract

Arsenic volatilization in the environment is thought to be an important pathway for transfer from terrestrial pools to the atmosphere. However, this phenomenon is not well characterized due to inherent sampling issues in trapping, quantifying and qualifying these arsine gases; including arsine (AsH(3)), monomethyl arsine (MeAsH(2)), dimethyl arsine (Me(2)AsH) and trimethyl arsine (TMAs). To quantify and qualify arsines in air we developed a novel technique based on silver nitrate impregnated silica gel filled tubes. The method was characterized by measuring the recovery of trapped arsines after elution of this chemo-trap with hot boiling diluted nitric acid. Results from three separate experiments, measured by ICP-MS, showed that the method is reproducible and quantitative. Arsine species recovery ranged from 80.1 to 95.6%, with limit of detection as low as 3.8 ng per chemo-trap tube. Moreover, HPLC-ICP-MS analysis of hot boiling water eluted traps showed that the corresponding oxy ions of the arsines were formed with the As-C bonds of the molecule intact, hence, allowing qualification of trapped arsine species. A microcosm study examining volatile arsenic evolution from field contaminated Bangladeshi paddy soils (24.2 mg/kg ar...Continue Reading

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Citations

Jun 5, 2013·Environmental Science and Pollution Research International·Gao Ling ShiQing Sheng Cai
Apr 8, 2011·Environmental Science & Technology·Adrien MestrotEva M Krupp
Feb 3, 2012·Environmental Science & Technology·Hai HuangYong-Guan Zhu
Jun 26, 2012·Environmental Science & Technology·Yan JiaYong-Guan Zhu
Mar 26, 2013·Environmental Science & Technology·Fang-Jie ZhaoAndrew A Meharg
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