伊通河长春段地表水中铅、铬、镉形态变化规律

对2003~2006年伊通河长春段6个地表水监测断面中重金属铅、铬、镉形态变化规律进行了研究。结果表明:地表水中铅和铬的年平均浓度呈递增态势;镉的浓度随流程的增加而增加,年平均浓度也呈递增趋势。此外,研究区域内铅主要以PbCO3、Pb3(PO4)2和Pb2+等3种形态存在,铬以CrO42-的形态存在,镉的存在形态以Cd2+为主,其中2006年铬超标约1.4倍,对水体的危害最大,镉有接近超标呈逐年升高的趋势。

Variation of Pb, Cr and Cd in the Changchun reach of the Yitong River

The variation of Pb, Cr, and Cd in the Changchun reach of the Yitong River is analyzed using the data from six monitoring cross sections from 2003 to 2006. The results show that the mean annual concentration of Pb, Cr and Cd increased year by year and the mean annual concentration of Cd increased along with the flow distance. In the study area, the main forms of Pb were PbCO3, Pb3（PO4）2 and Pb^2＋ , while the main forms of Cr and Cd were CrO4^2-. and Cd^2＋ , respectively. The Cr concentration in 2006 was 1.4 times the value of the water quality standard and it greatly harmed the water environment. The Cd concentration had an increasing trend, and was to be higher than the water quality standard value.