Analysis of Physicochemical Characteristics and Evaluation of Heavy Metals in The East Juyan Lake Basin Sediments

Sedimentation has always been a key technical problem that has plagued the long-term maintenance of lake storage capacity. In order to grasp the sediments physical and chemical characteristics and the spatial variation characteristics of heavy metal pollution in the East juyan lake basin, a total of 72 sediment surface samples were collected in the lake area and the particle size distribution, organic matter, pH value, chemical composition and heavy metal content were determined. The results show that: 1. The content of SiO2 in the East juyan lake basin sediments is the highest, and its average value accounts for 53% of the total sediments. The contents of K2O, CaO, Fe2O3, Na2O, and AI2O3 are all above 1%, and the pH values are all alkaline. 2. The overall average nitrogen and phosphorus content of the 17 sampling points is 573.76 mg/kg, 550.65 mg/kg, respectively. The overall average organic matter content is 0.58%, and the proportion of sediments samples with organic matter content reaching the level 5 soil standard is 41.2%. 3. The two metals Cu and As in the sediments are slightly polluted, and Zn, Cd, Pb and Hg are non-polluting. The comprehensive potential ecological risk level of heavy metals at most sampling points is mild pollution, and only 5.89% of the sampling points contain Cd elements with moderate potential risks. The research results can provide a scientific theoretical basis for the large-scale resource reutilization planning of East Juyan Lake Basin sediments.