Ibrahimpatnam Lake which is a fresh water Lake , was taken up for ecological investigation over a span of one year April 2014 – March 2015. According to the Hydrogen ion composition , the waters of, Ibrahimpatnam Lake were alkaline with a pH of 7.5 .The cations CO3— were 27.8 mg/l HCO3- were 219.4 mg/l and Cl- were 230.28 mg/l . The anion pH and the cation Cl- were within the permissible limits given by BIS(1983), WHO(1984) & ICMR(1975). Based on the Relative Proportion of anions, HCO3—was dominant during the summer while it was Cl- dominated during the Rainy & Winter seasons in this Lake. The anion Cl- in Ibrahimpatnam Lake was 30 times more than fresh water give by Bowen 1966 and 14 times more than Swedish Hardwaters given by Rodhe 1949.
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