HYDRO CHEMICAL EVALUATION OF GROUNDWATER IN MINE REGION, SALEM, TAMIL NADUN. THILAGAVATHI AND T. SUBRAMANIAbstract Hydrochemical investigations of groundwater have been carried out on objectives of evaluating groundwater quality. This paper presents assessment of hydro chemical characteristic of groundwater at chalk hill mine region in Salem, Tamil Nadu . For this study water quality data (20092011) of 30 groundwater wells spread over the study area were used to understand the groundwater geochemistry and hydro geochemical process regulating the groundwater quality. The approaches followed here include the chemical analyses for major ions and construct the hydro chemical maps of total dissolved solids (TDS), sodium (Na+), bicarbonate (HCO3-) and chloride (Cl-) ions. Sources of major ions in groundwater were analyzed. Physical and chemical parameters of groundwater such as electrical conductivity , pH, total dissolved solids (TDS), Na+, K+, Ca2+, Mg2+, Cl , HCO3, SO4 and NO3 were determined. Concentrations of the chemical constituents in groundwater vary spatially and temporarily. Groundwater in the area is generally hard, fresh to brackish, high to very high saline and low alkaline in nature. High total hardness and TDS in a few places identify the unsuitability of groundwater for drinking and irrigation. Such areas require special care to provide adequate drainage and introduce alternative salt tolerance cropping. Fluoride and boron are within the permissible limits for human consumption and crops as per the international standards.
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