巢湖、洞庭湖、鄱阳湖沉积物重金属污染及来源的Meta分析

Mate analysis of heavy metal pollution in sediments of Chaohu Lake,Dongting Lake and Poyang Lake.

对2004~2021年关于巢湖、洞庭湖、鄱阳湖沉积物中重金属浓度的研究进行了分析,并对3个湖泊沉积物的重金属地质累积、潜在生态风险和毒性进行了蒙特卡洛分析,以清晰、客观、全面地描述3个湖泊沉积物的重金属污染情况.结果表明,3个湖泊均存在不同程度的Cu、Zn、Pb、Ni、Cr和Cd污染,总体污染程度上,鄱阳湖>洞庭湖>巢湖.地累积指数表明,Cd是3个湖泊中最主要的污染元素,巢湖沉积物中Cd处于偏中度污染水平占比为84.76%,洞庭湖沉积物中Cd处于偏重度污染水平占比为32.64%,鄱阳湖沉积物中Cd偏重度污染水平占比达到46.64%.巢湖、洞庭湖和鄱阳湖RI值中Cd元素为主要贡献者,占比分别为80.26%、91.04%和90.03%.巢湖整体处于中低风险,洞庭湖RI值高风险概率为60.74%;鄱阳湖重金属RI值高风险概率68.95%,生态风险高.毒性结果表明,三个湖泊沉积物毒性较高的是Pb和Cr,巢湖沉积物中的重金属毒性处于低度毒性水平,洞庭湖沉积物中度毒性水平的累积概率为69.03%,鄱阳湖中度毒性水平的累积概率为7.18%.巢湖、洞庭湖、鄱阳湖重金属污染情况各不相同,重金属大体上存在3~4个不同来源:工业源、交通源、农业源和自然源,巢湖交通源为主要影响,污染较轻;洞庭湖和鄱阳湖主要污染源为工业活动,污染较重.

The study analyzed the heavy metal concentrations of Chaohu Lake,Dongting Lake and Poyang Lake sediment from 2004 to 2021,and conduct the Monte Carlo uncertainty analysis of geoaccumulation,potential ecological risk and toxicity heavy metal of the three lakes to objectively and comprehensively describe the contamination degree.The results showed that,the three lakes were polluted by Cu,Zn,Pb,Ni,Cr and Cd in different degrees and followed with the order:Poyang Lake>Dongting Lake>Chaohu Lake.The geoaccumulation indices showed that Cd is the dominant pollutant in all three lakes,and the probabilities were 84.76%for moderatesediment contamination,in Chaohu Lake,32.64%for heavy sediment contamination in Dongting Lake and 46.64%for heavy sediment contamination in Poyang Lake respectively.Cd contribute most to the potential ecological risks index(RI),and its proportion in the Chaohu lake,Dongting lake and Poyang lake were 80.26%、91.04%and 90.03%,respectively.Chaohu lake were at low-moderate risk,Dongting lake take the 60.74%possibility of high risk and Poyang lake take 68.95%possibility of high risk.Toxicity unit evaluation results indicated that Pb and Cr were the main contributor of toxicity in three Lakes sediment.The toxicity of heavy metals was observed the low level in the Chaohu lake and Dongting lake,but the moderate leve in Poyang lake with a 69.03%cumulative probability.The heavy metals of surface sediments in Chaohu lake,Dongting lake and Poyang Lake mainly derived from industry,transportation,agriculture and natural sources.The heavy metal contaminatio of Chaohu Lake mainly came from transportation,while Dongting lake and Poyang Lake mainly came from industry.