Study on Floating Sand Accumulation, Physicochemical Characteristics and Heavy Metal Pollution in the Sediment of Lake Hongze

Abstract

Abstract: Based on related researches on Lake Hongze in recent 20 years, data of characters and physicochemical properties of Lake Hongze sediments and sediments runoff were collected and analyzed. Sediment runoff into the lake exceeds that out of the lake which made it in silting situation. The distribution and variation tendency of certain physicochemical properties were analyzed and evaluated. TN, TP and heavy metal concentrations in the sediments were evaluated. Most heavy metals achieved secondary standard of sediment evaluation. The severe pollution of heavy metals was related to super standard of Cd concentration. The precaution and control measures for Hongzehu Lake sediment pollutions were set forth. Using data about Lake Hongze from related researches in recent 20 years, this study calculated its floating sand balance by its income and outcome, and investigated its sediment geochemical characteristics and status of heavy metal pollution. Long-term floating sand data analyses showed that its income exceeds its outcome which makes the lake sediment accumulation. The spatial distribution and temporal variation tendency of several geochemical valuables were investigated including TN, TP and heavy metals. Most heavy metal concentrations in sediment of the lake exceed the second rank standard in the heavy metal pollution classification, whereas Cd concentration exceeds the third one, which means severe heavy metals pollution. Some suggestions are presented for the precaution and control of sediment pollutions in the lake.

Chen Lei, Zhang Wenbin,, Yu Hui, Lu Shaoyong. Study on Floating Sand Accumulation, Physicochemical Characteristics and Heavy Metal Pollution in the Sediment of Lake Hongze[J]. Chinese Agricultural Science Bulletin, 2009, 25(12): 219-226.

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