基于三种污染危害评价方法的上海市郊区河网底泥重金属评价

THREE ASSESSMENT METHODS ON HEAVY METALS CONTAMINATION IN RIVER SEDIMENTS OF SHANGHAI SUBURBAN AREA

分析了上海市某一郊区河网底泥13种重金属(银、砷、铍、镉、铬、铜、镍、铅、锑、硒、铊、锌、汞)的含量,采用生态风险指数法、污染负荷指数法和地积累指数法评价了底泥重金属污染。结果表明:13种重金属均有检出,平均值分别为0.8,28.0,0.5,0.9,480.4,204.6,58.6,52.0,1.4,3.8,0.2,890.2,0.1 mg/kg;3种评价方法结果均表明河网底泥受到一定程度的重金属污染,污染贡献以4号点位的镉、铬、铜、锌较大。

Base on three assessment methods,the paper evaluated thirteen heavy metal elements（ Ag,As,Be,Cd,Cr,Cu,Ni,Pb,Ti,Sb,Se,Zn,Hg） sampled from river in Shanghai suburban area. The results showed that thirteen heavy metals content were above the limit of detection,the avevage content of Ag,As,Be,Cd,Cr,Cu,Ni,Pb,Ti,Sb,Se,Zn,Hg was 0. 8,28. 0,0. 5,0. 9,480. 4,204. 6,58. 6,52. 0,1. 4,3. 8,0. 2,890. 2,0. 1 mg / kg,respectively. Pollution risk assessment results showed that the sediments were polluted by heavy metals. The pollution contribution of Cd,Cr,Cu and Zn in four locations was much bigger.