电子垃圾拆解地区土壤和植物中邻苯二甲酸酯分布特征

Distribution characteristics of phthalic acid esters in soils and plants at e-waste recycling sites in Taizhou of Zhejiang,China

近年来,电子垃圾不当拆解带来的环境问题引起国际社会的极大关注.本研究对浙江省台州市不同电子垃圾拆解地区土壤和植物样品中5种邻苯二甲酸酯类(PAEs)污染物进行了测定分析.结果表明:土壤(以干质量计)中PAEs类污染物的浓度为12.566～46.669mg.kg-1,其中邻苯二甲酸二异辛酯(DEHP)、邻苯二甲酸二丁酯(DBP)和邻苯二甲酸二乙酯(DEP)相对含量较高,约占PAEs总量的94%以上.拆解地区蚕豆(ViciafabaL.)中PAEs总量明显高于同地区其他植物,且土壤和所有植物体内PAEs浓度相关性均不显著(P>0.05).与美国国家环保局制定的土壤PAEs治理标准比较,台州电子垃圾拆解地区土壤PAEs污染较为严重.

In recent years,great attention has being paid on the consequences of improper electric and electronic waste（e-waste）disposal.In this paper,soil and plant samples were collected from the e-waste recycling sites in Taizhou City of Zhejiang Province,China,with five kinds of phthalic acid esters（PAEs）analyzed.In the soil samples,the total PAEs concentration was 12.566-46.669 mg·kg^-1 soil,among which,di-（2-ethylhexyl）phthalate（DEHP）,di-n-butyl phthalate（DBP）,and diethyl phthalate（DEP）were the major phthalates,accounting for more than 94% of the total.In the plant samples,the PAEs concentration was obviously higher in Vicia faba L.than in other plants.No significant correlations were observed in the PAEs concentration between soils and various plants（P〉0.05）.Comparing with the soil cleanup guidelines in USA,the soils at test sites were severely contaminated by PAEs.