辽西滨海矿集区重金属污染与评价

POLLUTION OF HEAVY METALS IN METAL DEPOSITS OF WESTERN LIAONING AND ITS ASSESSMENT

对辽西滨海矿集区的金属矿产开发区、冶炼厂以及污灌区土壤重金属污染状况进行研究与评价。结果表明,土壤重金属含量绝大多数高于土壤背景值,尤其 Cd、Pb、Zn 的污染状况更应该引起足够的重视。重金属总量及其有效态含量间存在着一定的伴生规律。按地累积指数法评价的结果是,金属矿山开采区重金属污染程度较为严重;根据次生相与原生相分布比法评价的结果是,金属冶炼厂附近人为污染程度更重。污染物主要来源于矿产开发、废岩、尾矿泥、选矿废水以及大气飘尘等。

An investigation and assessment of pollution of soils was carried out at metal mining, smeltery, and farmland irrigated with sewage in Western Liaoning. The results indicated that concentrations of heavy metals in these sites were higher above the background values. The high concentrations of Cd, Pb and Zn, in particular, should arouse more attention since they were well over the Governmental Standards in China for soils of agricultural use. Some companion relations existed between various metals, such as Pb with Cd and Zn. It is concluded that by using the Igeo method for determination, the degree of contamination was higher in the mining area and by using the RSP method it was higher in the soil around the smeltery. The heavy metals in the soil mainly come from untreated sewage used for irrigation, disposal of tailings and slurry from metal ore mining.