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Water is an essential natural resource for sustaining life and environment, however, chemical composition of surface or subsurface water is one of the prime factors on which the suitability of water for domestic, industrial and agricultural purpose depends. Fresh water occurs as surface water and groundwater, though groundwater contributes only 0.6 per cent of the total water resources on earth but it is a major source of irrigation besides domestic needs, particularly in semi-arid and arid areas due to an erratic rainfall and scarcity of surface water. The demand for water has increased over...