Author(s): Jogesh Laishram

Abstract: Assessment of some selected physico-chemical characteristics of Loktak lake was conducted in five water sampling stations (sites) i.e. Nongmaikhong, Phoubakchao, Laphupat Tera, Karang and Ithing villages located in and around Loktak lake from March 2013 to February 2014. During the study parameters such as Air Temperature (mean ranged from 21.50-24.33°C), Water Temperature (24.08 -25.88°C), pH (6.97-7.50), Dissolved Oxygen (4.59-7.10 mg/l), Biochemical Oxygen Demand (2.94-4.88 mg/l), Free CO₂ (5.87 - 17.60 mg/l), Total Dissolved Solids (60.83-80.83 ppm), Phenolphthalein Alkalinity (0-3.33 mg/l), Total Alkalinity (57.50-61.25 mg/l), Conductivity (115 -140.83 μS/cm) and Transparency (82.33-125 cm) across the five stations were analysed. Comparison of means of each physico-chemical parameter of the five sites and the variation of means over the sites is tested by one way ANOVA. Seasonal variations in physico-chemical parameters is studied. All the mean values of the parameters analyzed were observed below or between the standard limit lay down by WHO (World Health Organisation) except lower mean values of Dissolved oxygen recorded in Phoubakchao and Nongmaikhong stations. Hence, the water quality parameters of the studied season indicated moderate organic pollution of the lake. In order to maintain good water quality of the lake the concerned authorities and the communities living in and around the lake need to stop all those activities which causes pollution of the lake.

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