<![CDATA[AbstractMany activities arround Sepinang Lake contributes the input of organic and anorganic matter that influence the water quality, especially nutrient concentration in the water. This research was conducted of March – April 2018 in the Sepinang Lake and aims to understand the concentration of chlorophyll-a in the lake. Chlorophyll-a samples were collected from 3 stastions. In each stations there were two sampling sites, in the surface and 2 secchidepth. Sampling was done three times, once a week. Result shown that the chlorophyll-a content ranged from 4.32 µg/L – 9.24 µg/L. Based on the chlorophyll-a concentration, the Sepinang Lake can be categorized as mesotrophic to eutrophic. Water quality parameters values were temperature 30.6 0C - 31.50C, transparency 49.3 cm – 62.8 cm, depth 211 cm – 223.6 cm, DO 4.22 – 5.58 mg/L, CO2 9.32 – 15.98 mg/L nitrate 0.065 - 0.231 mg/L, phosphate 0.089 – 0.135 mg/L and pH 5.2 – 5.6.Keywords : mesotrophic, water quality, oxbow lake]]>
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