条子河底泥重金属污染特征及评价

目的]研究辽河典型支流—条子河的底泥污染状况。方法]沿条子河从上游到下游共布设5个断面,分别采集水样以及柱状底泥样品,对河水水质情况、条子河底泥含水率、有机质的空间分布特征、底泥中重金属的空间分布进行分析,并对底泥中重金属的污染状况进行评价。结果]柱状底泥样品由上层至下层,含水率逐渐降低;底泥中有机质含量在4%～10%范围内,Cu含量在14.07～68.66mg/kg范围内波动,Cd含量在0.01～1.05 mg/kg范围内,Cr含量范围是21.55～78.10 mg/kg,Zn是61.1～2 602.0 mg/kg,As的含量在4.83～30.10 mg/kg范围内波动,Hg的含量范围是0.08～1.22 mg/kg。结论]条子河水水质属于劣V类水质,条子河底泥重金属Zn,Hg受污染现象较为普遍,个别样点已达到重度污染的程度,个别底泥中Cu、Cd受到轻度污染。

Pollution Characteristics and Assessment of Heavy Metals in Tiaozi River Sediments

Objective] The aim was to study the sediments pollution condition of Tiaozi River,which is a typical tributary of Liao River.Methods] Along with the Tiaozi River,five sections were selected from upriver to downriver,and water samples and the column sediment samples were collected from those five sections.River water quality,moisture content of sediments,the spatial distribution of organic matter and the spatial distribution of heavy metals in sediment had been analyzed,moreover,the pollution condition of heavy metals in sediments were also evaluated.Result] Moisture content was decreased from the upper to the lower of cylindrical sediment samples.The range of organic matter content fluctuated within 4%-10%.The contents of Cu,Cd,Cr,Zn,As and Hg were in turn: 14.07-68.66,0.01-1.05,21.55-78.10,61.1-2 602.0,4.83-30.10,0.08-1.22 mg/kg.Conclusion] The water quality of Tiaozi River was worse than grade Ⅴ.It was universal that the sediments of Tiaozi River were polluted by Zn and Hg.It should be paid attention to that some severely polluted samples were likely to have adverse effects on the environment.In addition,some samples were lightly polluted by Cu and Cd.