Genetic Assessment of the suitability of selected methods for species level determination of arsenic in some contaminated inceptisols of West Bengal

B SINHA; K BHATTACHARYYA

doi:10.56093/ijas.v84i7.41987

Authors

B SINHA College of Agriculture, OUAT, Bhawanipatna, Odisha
K BHATTACHARYYA Directorate of Research, Bidhan Chandra Krishi Viswavidyalaya, Kalyani, Nadia, West Bengal 741 235

https://doi.org/10.56093/ijas.v84i7.41987

Keywords:

Arsenic, Extractant, Soil

Abstract

Elevated level of arsenic in agricultural soils cause potential toxicity to human health, plants and microbes through food-chain, the magnitude being the highest in Bangladesh, followed by West Bengal, India. Since the toxicity and bioavailability varies with arsenic species, it is essential to develop and standardize suitable methodology to estimate arsenic species separately in different matrices. In this study, an attempt has been made to assess the suitabilities of three different extractants, namely orthophosphoric acid (1M H3PO4, pH 1.39), ammonium dihydrogen orthophosphate (1M NH₄H₂PO₄, pH 4.14) and di ammonium hydrogen = orthophosphate [1M (NH4)2HPO4, pH 8.26], in determining the arsenic species in selected contaminated inceptisols of West Bengal. The results showed that the extraction efficiency varies with the composition of the extraction solution. The lowest recovery (3.74-17.61%) were obtained with the 1M (NH4)₂HPO₄, pH 8.26, the highest recovery (34.89-73.29%) obtained with the 1M H₃PO₄, pH 1.39 and 4.04-52.30% recovery was obtained using 1M NH₄H₂PO₄, pH 4.14.

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