Abstract
A detailed study on hydrochemistry of groundwater in Miyapur area, Ranga Reddy District, Andhra Pradesh, India has been carried out to assess the quality of groundwater for determining its suitability for drinking purpose. The area, underlained by grey and pink granites of granitoid complex, is associated with profused injections of 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. Twenty groundwater samples have been collected from bore wells during premonsoon and postmonsoon seasons of the year 2008. The samples were analysed for various water quality parameters such as pH, electrical conductivity, total dissolved solids (TDS), major cations like calcium, magnesium, sodium, potassium, and anions like chloride, nitrate, fluoride and sulphate. The physicochemical parameters have been compared with the standard guideline values as recommended by WHO and BIS for drinking and public health. It is observed that the pH value is not exceeding the excessive limits in both premonsoon and postmonsoon. Overall, the samples of premonsoon and postmonsoon seasons are not exceeding the excessive limits of calcium. All the samples of both premonsoon and postmonsoon are exceeding the excessive limits of magnesium, which indicates that the water is becoming hard due to the pollutants coming out from the industries. Sodium and potassium indicates increase in levels of sodium in groundwater due to percolation from sodium and potassium bearing minerals. Anions like chloride in all the samples are not exceeding the permissible limits. The concentration of nitrate is above permissible limits. The concentration of fluoride is below permissible limits in postmonsoon. Sulphate concentration is less than permissible limit in all the samples of premonsoon and postmonsoon.