Heavy Metals and Nutrients Pollution in Sediments of Luoma Lake
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Abstract:
The 137Cs isotope dating method was used to determine the dating of sediment cores in the Luoma Lake, and the vertical profile and horizontal distribution of heavy metals and nutrients were investigated. The results showed that (1) the average sedimentation rate of Luoma Lake is 3.5 mm/a; (2) the nutrient contents increase gradually and the contents of most heavy metals decrease or stay stable with the decreasing in depth, while the contents of Cd and Pb increase; and (3) the peak values of most heavy metals occurin the center of the lake, whereas the peak values of nutrients occur in the west and south of the lake. Therefore, the main pollution in the Luoma Lake was caused by Cd, Pb, and nutrients, and it occurred mainly in the center of the lake.