厦门湖里工业区土壤重金属污染特征及淋溶特性分析

通过美国EPA颁布的酸消解方法和浸出毒性(Toxcity Characteristic Leaching Procedure,TCLP)法及荷兰能源研究中心提出的潜在可淋洗性方法对厦门市湖里工业区中土壤重金属污染进行综合评价.结果表明:该区域部分土壤中有不同程度的Cu、Zn、Hg积累,其有效含量分别在3.6~477.65 mg/kg、33.2~215.6 mg/kg、0.17~7.76 mg/kg之间,局部地区Cu和Cr污染程度比较严重;TCLP法提取的重金属量同EPA消解法测得的重金属含量基本保持成正比关系,且其浓度分布状况大致相同.此外,通过模拟酸性降雨对金属污染物毒性释放影响的测算结果表明:强酸性降雨能较大程度地促进土壤中重金属的释放,在制定城市环境污染防治对策中需要对此给予足够的重视.

The Contaminated Properties and Potential Leachability of Heavy Metals in Soils from Huli Industrial Estate in Xiamen City

Soils of Huli industrial estate,a highly unbanized area of Xiamen City were surveyed and assessed for heavy metal pollution.The results of US environmental protection apecy(EPA) digestion procedure showed that some soils were anthropogenically contaminated,and the available levels of Cu,Zn and Hg were 3.6~477.65 mg/kg,33.2~215.6 mg/kg,0.17~7.76 mg/kg,respectively.The amounts of the TCLP(toxic characteristics leaching procedure) leached fractions were in accordance with that extracted by EPA acid digestion.Potential leachability of some heavy metals,e.g.Cu,Zn,defined as the maximum pool that may become available for leaching at a constant pH 4 or 3,showed that strong acid precipitation could release heavy metals to a considerable extent.