长江口近十年上覆水Pb浓度演变特征分析

为了解长江口南北支上覆水中溶解态重金属的演变特征,运用Mann-Kendall法和R/S分析法分析了徐六泾水域、青龙港水域、启东港水域、东风西沙水源区、石洞口水域、南港水域、北港水域等7个水域中溶解态Pb浓度近十年来的变化并对未来的变化趋势进行预测,结果表明:7个水域Pb年平均浓度均在0.15mg/L以下,均达到了Ⅱ类水标准指标;除启东港和青龙港水域Pb浓度较高外,其余5个水域上覆水中Pb浓度均处于较低水平,且变化幅度较小;7个水域的Pb浓度总体都呈轻微下降趋势;Pb浓度演变与工业废水排放等因素有关。

Analysis of Evolution Characteristics of Pb Concentration in Overlying Water in the Yangtze River Estuary in Recent Ten Years

The Yangtze River estuary is used as the research area to study the evolution characteristics of dissolved heavy metals in the overlying water of the north and south branches.The Mann-Kendall method and R/S analysis method are used to analyze the concentration of dissolved Pb in seven waters,including Xuliutun,Qinglong,Qidonggang,Dongfeng Xisha water source area,Shidongkou,Nangang and Beigang waters.It shows how the concentrations have changed over the past decade and predicts future trends.The results show that the average annual Pb concentrations of seven waters were all below 0.15mg/L,and all reached the Class II water standard;except for the concentration of Pb in the waters of Qidong Port and Qinglong Port,which were higher than the other five waters,the other five waters were at a low level and changed slightly;the Pb concentration in the seven waters showed a slight downward trend;the evolution of Pb concentration was related to industrial wastewater discharge and other factors.