Variation in arsenic concentration relative to ammonium nitrogen and oxidation reduction potential in surface and groundwater

Kiyoshi Kurosawa, Kazuhiko Egashira, Masakazu Tani, M. Jahiruddin, Abu Zofar M. Moslehuddin, M. Zulfikar Rahman

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Abstract

Arsenic (As), ammonium-nitrogen (N), nitrate-N concentrations, and oxidation-reduction potential (ORP) in the water samples from the river, pond, dug well, and shallow and deep tube wells (TW) were investigated in a farming village of southwestern Bangladesh. Concentrations of As and ammonium-N were the highest, whereas ORP was the lowest in the shallow TW water among the water sources. The ammonium-N concentration correlated positively with the As concentration and negatively with ORP for all samples, irrespective of the water sources. A rise in the ammonium-N concentration was hypothesized to enhance microbial activity, which in turn would lower ORP, and then As was released from sediments to the surrounding water in a reducing condition. The source of ammonium-N in the shallow TW water was identified as N fertilizer, based on the δ15N analysis. Thus, the influence of N fertilizer application on As contamination in groundwater was suggested.

Original languageEnglish
Pages (from-to)1467-1475
Number of pages9
JournalCommunications in Soil Science and Plant Analysis
Volume39
Issue number9-10
DOIs
Publication statusPublished - May 1 2008

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All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Soil Science

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