春、夏季长江口溶解态重金属的时空分布特征及其污染评价

根据2009年春季（5月）和夏季（8月）对长江口的调查监测资料,研究了海水中溶解态重金属（Cu、Zn、Pb、Cd、As、Hg）的时空分布特征,探讨了其影响机理,并对其污染水平进行了污染评价.结果表明,各重金属的质量浓度、空间波动程度在春、夏季,表、底层均存在一定的差异;Cu、Hg的污染最严重,且夏季污染水平高于春季;Cu与Pb之间有显著的正相关性,Zn与盐度之间有显著的负相关性,其余重金属与盐度之间无显著的相关性;各重金属的平面分布可以分为沿岸条带状高值区、沿岸-离岸联片高值区、点源发散状高值区;研究海域重金属的分布受自身特性和外界环境因子影响,沿岸高值区的形成主要受陆源输入和海水稀释的制约,离岸高值区的形成与悬浮体解吸和海底沉积物释放有关.

Spatial and temporal distribution and pollution evaluation of the dissolved heavy metals in the Changjiang Estuary

Based on the data of surveys during spring(May) and summer(August) from the Changjiang Estuary in 2009,the distribution characteristics of the heavy metal(Cu,Zn,Pb,Cd,As,Hg) and its influencing mechanism were analyzed,and evaluated the level of pollution.The results showed that the concentrations and fluctuation degree of the heavy metal were different during spring and summer,the surface and bottom in the waters;the pollution level of Cu,Hg was highest,and the level of pollution in summer was higher than i...