GROUNDWATER HYDROGEOCHEMISTRY OF BHUVANAGIRI BLOCK, CHIDAMBARAM TALUK, CUDDALORE DISTRICT, TAMIL NADU, INDIAK. KARTHIKEYAN AND S. POONGOTHATI Department of Civil Engineering, Annamalai University, Annamalai Nagar 608Abstract Groundwater geochemical concentration was studied in Bhuvanagiri Block to understand the ionic source and its suitability for drinking and irrigational purposes. Geologically the area consist of crystalline rocks of Archaean age, older sedimentary rocks of the cretaceous age and younger sedimentary of the Mio-Pliocene age. About 16 bore well samples were collected at different locations and the analyses were carried out for the major cations and anions. The data were analysed using software WATCLAST and interpreted with Gibbs diagram. The range of chemical concentration of cations such as Ca, Mg and anions like Cl, SO4, NO3 values were 14.0 to 136.0 mg/ l,06 to 38.0 mg/L and 15.0 to 364.0 mg/L, 7.0 to 151.0 mg/L 1.0 to 27.0 mg/L respectively. The range of concentration of Fe and F were between 0.03 to0.266 mg/L and 0.1 to1.0 mg/L respectively. The result shows that most of the sample locations are not exceeding the maximum permissible limit. To understand the geochemical facies and its source, data were interpreted with Gibbs diagram. The study shows that the present amount of ionic concentration is mainly from source rock of the study area. The hydro geochemical characters are not detrimental to soil and agriculture activities of the study area.
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