Pollution Characteristics and Ecological Risk of PBDEs in Water and Sediment from an Electronic Waste Dismantling Area in Taizhou
- 海洋环境－已发表论文 
以台州某电子垃圾拆解工业园为圆心,在半径为16 km的范围内,由近及远设计了C(3 km)、S(5~10 km)和R(10~16km)三圈共30个采样点,研究了该区域水及沉积物中多溴联苯醚(PBDEs)的污染特征与生态风险.结果表明,水中PBDEs含量为9.4~57.2 ng·L~(-1),平均值为25.9 ng·L~(-1);沉积物中PBDEs含量为3.7~38 775 ng·g~(-1),平均值为2 779 ng·g~(-1);BDE-209均为主要成分.水及沉积物中PBDEs含量的空间分布态势均为:C圈>S圈>R圈,沉积物中PBDEs含量和离工业园区中心的距离呈极显著负相关(P<0.01).与国内外其它地区相比,该调查区PBDEs污染较为严重,电子垃圾拆解是PBDEs污染的主要来源.经推算,该区域近40年的拆卸活动向该地输入的PBDEs总量达30.7 t,其中BDE-209为28.9 t.采用商值法对PBDEs进行初步的生态风险评估表明,拆解核心区(半径为1.5 km)沉积物中五溴联苯醚(Penta-BDEs)的污染程度已达高风险等级,对该地区的生态安全和人群健康可能造成严重影响.An e-waste dismantling industrial park of Taizhou was selected as the sampling center,within a radius of 16 km,and a total of 30 sampling sites were designed in three circles as follows: C( 3 km),S( 5-10 km) and R( 10-16 km). Pollution characteristics and ecological risk of polybrominated diphenyl ethers( PBDEs) in water and sediments were investigated. The concentrations of PBDEs in water ranged from 9. 4 to 57. 2 ng·L~(-1),with a mean value of 25. 9 ng·L~(-1); and 3. 7 to 38 775 ng·g~(-1),with an average of 2 779ng·g~(-1)in sediments. BDE-209 was the predominant congener. The spatial distribution patterns of PBDE levels in water and sediment were both in the following order: C > S > R. Furthermore,the concentrations of PBDEs in sediments showed significant negative correlation against the distance from the industrial park( P < 0. 01). Compared with other regions around the world,the PBDEs contamination was more serious in the area,which indicated that e-waste dismantling activity was one of the significant sources for PBDEs pollution. It was estimated that a total of 30. 7 t PBDEs( including 28. 9 t BDE-209) was discharged into surrounding environment as a result of dismantling industrial activities in last 40 years. A preliminary ecological risk assessment for PBDEs in water and sediments was conducted by hazard quotient method. The results demonstrated that the Penta-BDEs in the center of e-waste dismantling area( a radius of 1. 5 km) was at particularly high risk level and could cause serious influence on the ecological safety and human health.