麦庙港—备塘河底泥污染状况及生态风险评价

对麦庙港-备塘河6个点位的底泥重金属和有机污染物进行了监测。结果表明重金属含量分布不均,且范围波动较大,除2个测点锌超过《农用污泥中污染物控制标准》(GB4284-84),其它重金属指标均达标。4个监测点位底泥有机污染物氯仿、二氯乙烷、苯、甲苯、二甲苯、乙苯、六六六、滴滴涕含量均达相关标准。底泥重金属的潜在生态风险顺序依次为汞>镉>铜>锌>镍>砷>铬>铅,各点位的潜在生态风险污染顺序为S2>S3>S5>S6>S1>S4,汞是主要的潜在生态风险因子。讨论认为,S2～S4点位河段的污泥不宜农用和园林绿化利用,应根据危险特性鉴别结果妥善处置。

Pollution in Maimiao-Beitang River Sediment and Assessment of Its Potential Ecological Risk

The heavy metals and organic pollutants in sediment of 6 points of Maimiao-Beitang River were monitored.The results showed that the uneven distribution of heavy metals and volatile areas,in addition to two mornitoring sites,which zinc contents were over "Control standards for pollutants in sludges from agricultural"(GB4284-84),other indicators of heavy metals met the standards.Organic pollutants chloroform,dichloroethane,benzene,toluene,xylene,ethylbenzene,BHC,DDT levels in four monitoring sites sediment reached the relevant standards.Potential ecological risk of heavy metals in sediment followed the order Hg> Cd> Cu> Zn> Ni> As> Cr> Pb,the point position of the potential ecological risks of pollution followed the order S2> S3> S5> S6> S1> S4,Hg was the main potential ecological risk factor.Discussion result is that sediment in S2 ~ S4 can’t be utilized in agriculture and landscaping,it should be proper disposed based on identification of hazardous properties.