were measured by using a flame photometer. Total dissolved solids (TDS) were measured by
evaporation and calculation methods (Hem, 1991). Ca 2+ and Mg 2+ were determined
titrimetricaly using standard EDTA. Chloride was estimated by AgNO3 titration. Sulphate
was analysed using the turbidimetric method (Clesceri et al. 1998). Nitrate was analysed
using UV–visible spectrophotometer (Rowel , 1994).