Measurement of Soluble Arsenic in Soil of Bangladesh by Acid-alkali Sequential Extraction

Authors

  • Mohammad Shafiul Azam Dept. of Environmental System Engineering, Ritsumeikan University, Japan
  • Md. Shafiquzzaman Department of Environmental Systems Engineering, Ritsumeikan University, Japan
  • Iori Mishima Group of Water Environment, Center for Environmental Science in Saitama, Japan
  • Jun Nakajima Department of Environmental Systems Engineering, Ritsumeikan University, Japan

DOI:

https://doi.org/10.3329/jsr.v1i1.1058

Keywords:

Acid-alkali extraction, Arsenic contamination, Soil arsenic mobility, Groundwater contamination, Paddy soil.

Abstract

To measure easily soluble fraction of arsenic, a sequential extraction method by 0.1N HCl and 0.1N NaOH was used according to the soil phosphorus extraction procedure. The effects of reducing conditions on arsenic extraction were examined in incubation test. In high reducing conditions arsenic solubility was shown to be high and seemed to be controlled by dissolution of iron oxy-hydroxides. pH played a predominant role in determining the concentrations of soluble arsenic. Arsenic solubility could be possible at low or high pH conditions. Released arsenic in different pH and redox conditions showed that it is a part of acid extractable arsenic which is sorbed weakly on the soil surface and can be extracted during acid-alkali sequential extraction. Therefore, the method could be applicable to measure potential solubility of arsenic as a result of alteration in soil (e.g. redox, pH) and environmental factors. Sequential extraction results of the soil samples collected in dry and wet season suggested that acid-alkali extracted arsenic fractions of surface and core soil samples of paddy field were increased in wet season. They seemed to be moved with irrigation groundwater.

 

Keywords: Acid-alkali extraction; Arsenic contamination; Soil arsenic mobility; Groundwater contamination; Paddy soil.

 

© 2009 JSR Publications. ISSN: 2070-0237(Print); 2070-0245 (Online). All rights

reserved.

 

DOI: 10.3329/jsr.v1i1.1058

 

 

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Author Biographies

Mohammad Shafiul Azam, Dept. of Environmental System Engineering, Ritsumeikan University, Japan

Dept. of Environmental System Engineering,
Ritsumeikan University,
1-1-1 Nojihigashi,
Kusatsu, Shiga 525-8577,
Japan

Md. Shafiquzzaman, Department of Environmental Systems Engineering, Ritsumeikan University, Japan

Department of Environmental Systems Engineering,
Ritsumeikan University,
Japan

Iori Mishima, Group of Water Environment, Center for Environmental Science in Saitama, Japan

Group of Water Environment,
Center for Environmental Science in Saitama,
Japan

Jun Nakajima, Department of Environmental Systems Engineering, Ritsumeikan University, Japan

Department of Environmental Systems Engineering,
Ritsumeikan University,
Japan

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Published

2008-12-25

How to Cite

Azam, M. S., Shafiquzzaman, M., Mishima, I., & Nakajima, J. (2008). Measurement of Soluble Arsenic in Soil of Bangladesh by Acid-alkali Sequential Extraction. Journal of Scientific Research, 1(1), 92–107. https://doi.org/10.3329/jsr.v1i1.1058

Issue

Section

Section B: Chemical and Biological Sciences