武江 (乐昌段)水体底泥重金属污染调查

对武江乐昌段由上游矿山废水排泄沟、中游霜降河和下游武江段3段水道底泥中Pb、Zn、Cu进行测定.结果表明,Pb的质量比为2.54×103 mg/kg、1.33×103 mg/kg和30.7 mg/kg,Zn的质量比为1.01×103 mg/kg、2.48×103 mg/kg和156 mg/kg,Cu的质量比为42.9 mg/kg、68.8 mg/kg和69.4 mg/kg.3段支水道底泥污染负荷指数(IPL值)分别是14.0、10.6和1.46,整个区域IPL值为6.19,达到极强度污染程度.Pb、Zn总体污染程度比Cu严重,对武江乐昌段及其下游地区存在潜在生态风险.指出,霜降河和废水排泄沟段底泥不能农用,需特别谨慎地疏浚、转运和处置,而武江段底泥则可农用.

Investigation on HeavyM etalPollution in the Surface Sedimentson Lechang Section ofW ujiang River

ThePb, Zn and Cuwere detectedinthesurfacesedimentson upriverofwastewaterdrainagecanalfrom Lechangmine, themiddleriverofShuangjiangstream and downriverofWujiangriver. Theresultsindicatedthatratesbetween heavy metalconcentration and nationalcontrolstandards forthe Pb in sludge were 2.54×10 3 mg/kg, 1.33×10 3 mg/kg and30.7 mg/kg, thatforthe Zn 1.01×10 3 mg/kg, 2.48×10 3 mg/kg and 156 mg/kg,thatfortheCu 42.9 mg/kg, 68.8 mg/kg and 69.4 mg/kg. Thepollution load index( I PL ) of surfacesedimentsonthe3 partsofW ujiangriverwas14.0, 10.6 and 1.46separatelyandshowed heavy pollution. Thesedimentsonthe upriverand Shuangjiangstream could notbe directly used foragricultureand should becarefully dredged, transported andtreated. ThesedimentsonthedownriverofWujiangrivercouldbeusedfor agriculture. ThepollutionlevelsofPb and Zn werehigherthanthatofCu and itposed potentialecologicalrisk forthelocaland downriverareasofW ujiangriver.