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Distribution of dissolved amino acids and its environmental significance in water of Taihu Lake, China. |
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Abstract The concentrations and molecular weight of dissolved amino acids (DAAs) were investigated in water of Taihu, a large, shallow and eutrophic freshwater lake in China. DAAs were mainly existed as “true dissolved” form in the lake water, which colloidal form average occupied 10% of DAAs. Concentration of DAAs showed a significant spatial heterogeneity, which was lowest in river mouth and was highest in the mouth of Meiliang Bay, a hypereutrophic bay of Taihu and serious Microcystis algal bloom happened each summer. Generally, histidine, arginine, lysine, serine and tryptophan were the main forms of DAAs in the water of Taihu. Internal sources mainly from the decomposing of plankton should be the main source of DAAs in Taihu. The composition of DAAs was also possible used as an indicator of biological degradation state of the organic matter in the lake.
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Received: 22 February 2010
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