射阳河底泥重金属沿程变化分析及污染评价

Analysis on Heavy Metal Variation in Bottom Sediment along Sheyang River and Its Pollution Assessment

分析了射阳河流域沿程20个底泥样品中6种重金属(Cr、Pb、Ni、Zn、Cu、As)的含量,并应用地累积指数法对其进行了污染评价。研究结果表明:除As在近一半的采样点没有污染,其他重金属污染均普遍存在,但多数属于轻度污染。Zn污染最为严重,几乎全程都是偏中等或中等以上的污染。纵观射阳河全程样品FN04,SY07污染最为严重,前者与其支流西塘河的污染有关,后者可能与河闸上侧的死水状态有关;黄沙河污染最轻,与河流沉积物粒径比较粗而导致的对重金属吸附能力减弱有关。

Total concentration of six elements ,namely Cr, Pb,Ni,Zn,Cu and As , were determined in 20 bottom sediments in Sheyang River, Jiangsu Province. Pollution assessment was carried out applying the index of geoaccumulation. The results indicated that pollutions generally existed for all heavy mentals studied except As, thouth mostly not serious. The pollution was more serious for Zn. Along the flow path, the heaviest pollution was observed in sample FN0 4and SY07, the former was linked with the pollution in tributary of Xitang River while the latter was caused by dead water upriver the gate ;the least pollution exist in Huangshahe River, that was resulted by its coarse sediment whieh redueed absorption ability.