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

Adrien Mestrot, Miran Kalle Uroic, Thomas Plantevin, Mohammad Ayub Islam, Eva Maria Krupp, Jorg Feldmann, Andrew Alexander Meharg

Research output: Contribution to journalArticle

72 Citations (Scopus)

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; incudling arsine (AsH), monomethyl arsine(MeAsH), dimethyl arsine (MeAsH) 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 mesuring 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-ICPMS 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 arsenic) was used to show the application of silver nitrate chemo-trapping appraoch. Traps were placed on the inlet and the oulet of microcosms containing the soils that were either (cattle derived) manured or not, or flooded or not, in a factorial design. The headspace was purged with air at a flow rate of 12 mL/min. Results showed that as much as 320 ng of arsenic (0.014% of total soil content) could be emitted in a 3 week period for manured and flooded soils and that TMAs was the dominant species evolved, with lesser quantities of MeAsH. No volatile arsenic evolution was observed for nonmanured treatments, and arsine release from the nonflooded, manured treatment was much less than the flooded treatment. © 2009 American Chemical Society.
Original languageEnglish
Pages (from-to)8270-8275
Number of pages6
JournalEnvironmental Science & Technology
Volume43
Issue number21
Early online date17 Sep 2009
DOIs
Publication statusPublished - 1 Nov 2009

Keywords

  • mass spectrometry
  • ICP-MS
  • trimethylarsine
  • rice
  • gas
  • volatilization
  • speciation
  • antimony
  • Bangladesh
  • metalloids

Cite this

Quantitative and qualitative trapping of arsines deployed to assess loss of volatile arsenic from paddy soil. / Mestrot, Adrien; Uroic, Miran Kalle; Plantevin, Thomas; Islam, Mohammad Ayub; Krupp, Eva Maria; Feldmann, Jorg; Meharg, Andrew Alexander.

In: Environmental Science & Technology, Vol. 43, No. 21, 01.11.2009, p. 8270-8275.

Research output: Contribution to journalArticle

Mestrot, Adrien ; Uroic, Miran Kalle ; Plantevin, Thomas ; Islam, Mohammad Ayub ; Krupp, Eva Maria ; Feldmann, Jorg ; Meharg, Andrew Alexander. / Quantitative and qualitative trapping of arsines deployed to assess loss of volatile arsenic from paddy soil. In: Environmental Science & Technology. 2009 ; Vol. 43, No. 21. pp. 8270-8275.
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T1 - Quantitative and qualitative trapping of arsines deployed to assess loss of volatile arsenic from paddy soil

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AU - Uroic, Miran Kalle

AU - Plantevin, Thomas

AU - Islam, Mohammad Ayub

AU - Krupp, Eva Maria

AU - Feldmann, Jorg

AU - Meharg, Andrew Alexander

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AB - 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; incudling arsine (AsH), monomethyl arsine(MeAsH), dimethyl arsine (MeAsH) 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 mesuring 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-ICPMS 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 arsenic) was used to show the application of silver nitrate chemo-trapping appraoch. Traps were placed on the inlet and the oulet of microcosms containing the soils that were either (cattle derived) manured or not, or flooded or not, in a factorial design. The headspace was purged with air at a flow rate of 12 mL/min. Results showed that as much as 320 ng of arsenic (0.014% of total soil content) could be emitted in a 3 week period for manured and flooded soils and that TMAs was the dominant species evolved, with lesser quantities of MeAsH. No volatile arsenic evolution was observed for nonmanured treatments, and arsine release from the nonflooded, manured treatment was much less than the flooded treatment. © 2009 American Chemical Society.

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KW - gas

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KW - speciation

KW - antimony

KW - Bangladesh

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