【摘要】 为了解乌江中下游重金属分布及其季节变化情况,在乌江流域中下游干流、主要支流设置了17个断面进行了4个季节的调查。结果表明:乌江中下游重金属含量没有明显的季节变化规律;在不同季节,各断面砷(As)、铅(Pb)、汞(Hg)含量均达到Ι类水质标准;大部分断面的铜(Cu)、镉(Cd)含量在不同季节均能达到Ι类水质标准,但部分断面在特定季节只能达到Ⅱ类水质标准。更多还原

【Abstract】 To obtain the distribution and seasonal variations of heavy metals in the middle and lower Wujiang river, 4 seasonal surveys were organized to investigate 17 sampling cross-sections in the main stream and the large tributaries along the middle and lower Wujiang river. The results indicated that there were no obviously seasonal variations of the five heavy metals; As、Pb、Hg of all the 17 sampling cross-sections in the 4 seasonal surveys achieved to the class Ι of water quality, while Cu、Cd in some sampling cross-sections in some specific season could only sufficed to the class Ⅱ of water quality.更多还原