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以温州苍南县沿浦湾滩涂土壤中的重金属含量为指标,采用环境污染指数、地累积指数和潜在生态危害指数综合评价重金属的含量水平及对生态环境的潜在影响。结果表明:沿浦湾滩涂土壤中重金属含量较低,均符合土壤环境质量二级标准。除了元素砷和汞,铜、铅、铬、锌、镉5种重金属的含量均为高潮带和中潮带高于低潮带。潜在生态危害系数和地累积指数的顺序均为砷(As)>铜(Cu)>铅(Pb)>铬(Cr)>锌(Zn)>汞(Hg)>镉(Cd);不同重金属的地累积指数的污染等级顺序为砷(As)>铜(Cu)>铅(Pb)=铬(Cr)=锌(Zn)=汞(Hg)=镉(Cd),砷(As)是主要生态风险因子;总的潜在生态风险指数为中潮带>低潮带>高潮带。综合三种评价方法,除砷在地累积指数评价中等级为无污染到中级污染,其余重金属现状评价结果均为轻微或低污染。
The contents of heavy metals in soils along the beach of Cangpu Bay, Cangnan County, Wenzhou were used as indexes to evaluate the potential impact of heavy metals on the ecological environment by using environmental pollution index, ground accumulation index and potential ecological risk index. The results showed that the contents of heavy metals in the coastal land along the coast of Pupu Bay were lower than those of the second grade of soil environmental quality. Except for arsenic and mercury, the contents of five heavy metals, copper, lead, chromium, zinc and cadmium, were all in the high tide zone and the middle tide zone higher than the low tide zone. The order of potential ecological risk coefficient and ground accumulation index were As> Cu> Pb> Cr> Zn> Hg> Cd; The order of pollution degree of the cumulative index is As> Cu> Pb = Cr = Zn = Hg = Cd, As is the main ecological Risk factors. The total potential ecological risk index is mid-tide zone> low-tide zone> high tide zone. According to the three evaluation methods, except for arsenic, the level of non-polluting to medium-level pollution in the evaluation of the cumulative index, the rest of the heavy metals present evaluation results are slight or low pollution.