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Composition and distribution of nitrogen in Chaohu Lake and Wabu Lake sediments were studied. The results showed that the mean total nitrogen content in Chaohu Lake and Wabu Lake was 0.533 g/kg and 0.265 g/kg respectively, and the primary composition of nitrogen was organic nitrogen (94%). The organic index indicated that the organic pollution degree of Wabu Lake was lower than that of Chaohu Lake.