Estimation of Fluoride and Nitrate in Grund Waters of Arid Regions of Rajasthan Using ION Selective Electronis

Abstract

Standard spectrophotometeric methods are ineffective for the estimation of fluoride and nitrate in polluted / coloured samples of waters. For such waters, the method using ion-selctive  electrodes is more reliable, simple and rapid. Ground-waters of arid western Rajasthan containing high concentration of chlorides, bicarbonates, sulphates and other dessolved salts were analysed for fluoride and nitrate contents by this method. In high fluoride wters, there existed positive linear relationship between F^- and HCO₂^- and negative relationship between F^- and ( Ca²⁺ Ma²⁺). Concentration of Mg²⁺ was generally higher than that of Ca²⁺ in high fluoride waters.