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Extra resources for Natural Arsenic in Groundwater: Proceedings of the Pre-Congress Workshop "Natural Arsenic in Groundwater", 32nd International Geological Congress, Florence, Italy, 18-19 August 2004

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Then selected washed samples were chosen for heavy mineral fraction separation based on the differences in density of the minerals by Heavy Liquids Method (Mullar 1966) for XRD analysis. e. oxides, hydroxides and sulfides group of minerals) of the sediments for accurate determination of possible minerals containing solid phase arsenic. 1 RESULTS Lithofacies analysis The entire lithologic succession was examined from the cored sediment samples (Fig. 2). The zone of oxidation was observed to extend up to a depth of about 6 m from the surface as evidenced by the yellowish-brown color of the sediments.

Arsenic poisoning in Ganges Delta. Nature 401: 545–546. , Berner, Z. & Stüben, D. 2001. Arsenic contamination in groundwater, Murshidabad district, West Bengal. Proceed. Balkema, The Netherlands. K. & Chakroborti, D. 1996. Arsenic in six districts of West Bengal, India Environ. Geochem. Health 18: 5–15. ICAR 1992. Indian Council of Agricultural Research Report 48. D. & Patrick, Jr. H. 1991. Effect of redox potential and pH on arsenic speciation and solubility in a contaminated soil. Environ. Sci.

2002, Acharyya & Shah 2004b). Arsenic release by oxidation of pyrite has been disapproved in general, because pyrite is nearly absent in the affected aquifer sediments and sulfate concentrations are very low in affected groundwater. Biomediated reductive dissolution of hydrated ferric oxides (HFO) that occur mainly as coatings on sediment grains and corresponding oxidation of sedimentary organic matter is regarded as the main mechanism, which mobilizes arsenic to groundwater from aquifer sediments (Bhattacharya et al.

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