Arsenate and arsenite levels in the coastal and estuarine waters of Goa

S.P. Fondekar, C.V.G. Reddy


Arsenate and arsenite concentrations were determined in estuarine and coastal waters around Goa during the pre-monsoon months (February to April). Arsenate was found to be the dominant form in both the systems. In the estuarine waters, arsenate varied from less than 1 mu g/l to 21.75 mu g/l (av. 5.28 mu g/l) and arsenite from less than 1 mu g/l to 18.75 mu g/l (av. 2.54 mu g/l) while in coastal waters, it ranged from less than 1 mu g/1 to 24.0 mu g/l (av. 5.91 mu g/l) and arsenite from less than 1 mu g/1 to 9.0 (mu g/1 (av. 1.43 mu g/l). A few estimations of the total arsenic in the estuarine and coastal sediments indicate marked accumulation of this element (4 -14 ppm). The observed variations in the waters are attributed to the differential intensities of chemical and biological oxidation in the system, microbial reduction and the mixing processes


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