枯水期环太湖河流溶解态重金属空间分布

Spatial Patterns of Dissolved Heavy Metal in Surrounding Rivers of Lake Taihu during Dry Seasons

文章以环太湖53条出入湖河流为研究对象,测定2009年12月至2010年3月间(枯水季节)溶解态重金属含量,结果表明Mn、Ni、Cu、Zn、Cr、As等六种重金属溶解态浓度含量均较低,且未超标。将53条河流出入湖区域分为无锡常州区、宜兴区、湖州区、苏州区四个区域,无锡常州区除Cd外,其它重金属含量最高;Cd在宜兴区含量最高,湖州区含量次之,且超标现象严重;苏州区河流由于大部分时间出湖,故各重金属含量最低,水质最好。

Dissolved heavy metals including Mn,Ni,Cu,Zn,Cr,As and Cd in the inflow and outflow rivers of Lake Taihu during dry seasons from Dec.2009 to March 2010 were monitored,and results showed that concentrations of these heavy metals were relatively low except that of Cd.According to spatial distribution of heavy metal concentration,53 rivers were divided into 4 regions as Wuxi and Changzhou Region rivers,Yixing Region rivers,Huzhou Region rivers and Suzhou Region rivers for comparison.Concentrations of heavy metals in Wuxi and Changzhou Region rivers were the highest except Cd,while Cd concentration in Yixing Region and Huzhou Region rivers was high and far beyond environmental quality standard for surface water.Rivers in Suzhou Region were in good conditions compared with rivers in other regions because they are outflow rivers from the Lake.