Arsenic biogeochemistry as affected by phosphorus fertilizer addition, redox potential and pH in a west Bengal (India) soil

A. Signes-Pastor, F. Burlo, K. Mitra, A. A. Carbonell-Barrachina*

*Corresponding author for this work

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

This laboratory experiment systematically examines arsenic, iron, and phosphorus solubilities in soil suspensions as affected by addition of phosphorus fertilizer under different redox potential (Eh) and pH conditions. Under aerobic conditions, As solubility was low, however, under moderately reducing conditions (0, -150 mV), As solubility significantly increased due to dissolution of iron oxy-hydroxides. Upon reduction to -250 mV, As solubility was controlled by the formation of insoluble sulfides, and as a result soluble As contents significantly decreased. Soluble Fe concentration increased from moderate to highly anaerobic conditions; however, it decreased under aerobic conditions likely due to formation of insoluble oxy-hydroxides. A low pH, 5.5, led to increased soluble concentrations of As, Fe, and P. Finally, addition of P-fertilizers resulted in higher soluble P and As, even though the concentration of As did not increased after an addition rate of 600 mg P kg(-1) soil. (c) 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)504-510
Number of pages7
JournalGeoderma
Volume137
Issue number3-4
DOIs
Publication statusPublished - 15 Jan 2007

Keywords

  • biogeochemistry
  • iron
  • redox potential
  • sulfur compounds
  • SEWAGE-SLUDGE
  • SEDIMENT
  • REDUCTION
  • CHEMISTRY
  • METALS
  • SUSPENSIONS
  • SOLUBILITY
  • SELENIUM
  • WATER
  • ZINC

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