Groundwater Quality Assessment of Miyapur Area in Ranga Reddy District, Andhra Pradesh, India

摘要

A detailed study on hydrochemistry of groundwater in Miyapur area, Ranga ReddyDistrict, Andhra Pradesh, India has been carried out to assess the quality ofgroundwater for determining its suitability for drinking purpose. The area, underlainedby grey and pink granites of granitoid complex, is associated with profused injectionsof aplite and fine grained quartzo felspathic veins and pegmatites basic intrusives,which include dolerite, gabbro and pyroxenite, cut across rocks in the study area.Red sandy soils and laterite soils are major soil types in this area. Twentygroundwater samples have been collected from bore wells during premonsoonand postmonsoon seasons of the year 2008. The samples were analysed for variouswater quality parameters such as pH, electrical conductivity, total dissolved solids(TDS), major cations like calcium, magnesium, sodium, potassium, and anionslike chloride, nitrate, fluoride and sulphate. The physicochemical parameters havebeen compared with the standard guideline values as recommended by WHO andBIS for drinking and public health. It is observed that the pH value is not exceedingthe excessive limits in both premonsoon and postmonsoon. Overall, the samplesof premonsoon and postmonsoon seasons are not exceeding the excessive limitsof calcium. All the samples of both premonsoon and postmonsoon are exceedingthe excessive limits of magnesium, which indicates that the water is becominghard due to the pollutants coming out from the industries. Sodium and potassiumindicates increase in levels of sodium in groundwater due to percolation from sodiumand potassium bearing minerals. Anions like chloride in all the samples are notexceeding the permissible limits. The concentration of nitrate is above permissiblelimits. The concentration of fluoride is below permissible limits in postmonsoon.Sulphate concentration is less than permissible limit in all the samples ofpremonsoon and postmonsoon.