EVALUATION OF HYDROGEOCHEMICAL CHARACTERISTIC OF RIVER DAMODARU. S. BANERJEE AND S. GUPTAAbstract The present research work was carried out to study the geochemical processes controlling water composition and variations in concentration of major ions in the study area of river Damodar. The analytical findings were plotted in geochemical ternary diagrams to find out the variability in water quality over this hydro-geographic condition. The concentration of different parameters of Damodar river water range between pH (7.5-8.7), EC (160-640 μs/cm), calcium (0.745-2.004 meql-1), magnesium (0.829-3.573 meql-1), bicarbonate (1.311-3.174 meql-1), ammonia (0.0-0.946 meql-1), sulphate (0.195-1.488 meql-1), sulphate (0.195- 1.488 meql-1), phosphate (0.0-0.036 meql-1), nitrate(0.0-0.024 meql-1), sodium(0.141-1.060 meql-1) potassium (0.059-0.248 meql-1), fluoride (0.019 -0.052 meql-1). Chemical data of water samples of the study area point towards a rock-dominance zone, according to the variations in the ratios of Na+: (Na+ +Ca2+) as a function of TDS in the water chemistry diagrams. Anion diagram study relating to Ca, Mg and (Na + K) reveals Ca2+ and Mg2+ are the major anion in the study area. Ternary diagram relating to HCO3, SO4 and Cl reveals HCO3 - is the major anion of Damodar river water. Weathering of rock-forming minerals and anthropogenic activities and coal-based industries are the major controlling factors for water chemistry in the study area.
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