Identification of Water Quality in Wet and Intermediate Zones in Selected, Sri Lanca: An Analytical Review
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This study is based on the analysis of drinking water parameters in selected wet and intermediate zones of Sri Lanka. Unsafe drinking water is one of the main concerns in developing countries. In Sri Lanka also the drinking water quality is a major concern in many places. A series of studies have been conducted in intensive agricultural production areas namely Jaffna, Vavuniya, Anuradhapura, Kurunagala and Hambantota representing a longitudinal section of Sri Lanka to understand the groundwater quality over the years of 2004 to 2009. Rural areas are facing agrochemical leaching problems in to the groundwater whereas the urban areas are facing the industrial and biological materials, seeping to the ground and surface water bodies. Water from selected areas were sampled throughout the villages of this area mostly from open wells and tube wells. The samples were analysed for their chemical quality in order to identify the water quality in compared with the Sri Lankan Drinking water standard. For this study Sodium (Na+), Calcium (Ca2+), Magnesium (Mg2+), Chloride (Clˉ), Sulphate (SO42ˉ) and Nitrate (NO3ˉ) were analysed. In Dry zone, the concentration of the Ca, Mg and Cl are higher than wet zones. Some sampling wells in dry zones have extreme concentration of Ca more than 1000 mg/l and this is a major threat to the consumers for the drinking purposes. In total 103 wells 6 percent of the sampling wells have been identified as contaminated whereas in total 96 wells in dry zone 64 percent of the sampling wells have been contaminated due to the chemical concentration.
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