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Arsenic Contamination of Tertiary and Cretaceous aquifers in and around Pondicherry Region, India

G V Rathnamala, Ashwini RM, Sivamurthy Reddy S

The concentration of Arsenic was measured in 54 typical Groundwater samples were taken from a variety of aquifers throughout the Pondicherry region. including urban, rural, and industrial zones. Eleven sediment samples were also collected from two boreholes at various depths, representing various aquifer systems, and tested for various arsenic levels. Mineral-bearing minerals were studied using XRD and petrographic methods. The average quantity of Arsenic in groundwater was determined to be 25.02 μg/l, with a range of zero to102 μg/l. Around 54% of the samples contain more Arsenic than the World Health Organization's preliminary recommended level of 10 μg/l. XRD study of sediment samples revealed the presence of arsenic-bearing minerals in the aquifer systems, including Pyrite, Realgar, Arsenolite, Claudetite, Scorodite, Covellite, Enargite, and prosstite.Because of the interaction between arsenic-bearing minerals and pore water, the greater In the examined location, the concentration of arsenic in groundwater is primarily geogenic..