典型电子废物焚烧区水生生物多溴联苯醚累积特征

对广东清远某电子废物焚烧区封闭水体中水生生物体PBDEs(多溴联苯醚)的累积特征进行了研究. 结果表明,草虾、田螺、河蚌、鲫鱼、鲤鱼、黄鳝和乌鳢等水生生物体内w(∑₂₁PBDEs)(以脂肪质量计)为0.2487~24.50μg/g. 该电子废物焚烧区水生生物PBDEs污染较严重,较我国其他地区开放性水体的水生生物体w(PBDEs)高出1~3个数量级. 其中,底栖动物河蚌和田螺体内PBDEs累积最高,w(∑₂₁PBDEs)分别为11.38和4.968μg/g. 不同同系物在水生生物体内累积差异较大,BDE209是水生生物体PBDEs累积的主要组分,占49.83%~91.48%,八溴代和九溴代BDE也发生了高累积. 营养级是电子废物焚烧区水生生物PBDEs累积的最主要控制因素,但捕食和生活习性对生物体尤其是软体动物PBDEs累积也产生了较大影响. 

Bioaccumulation of Polybrominated Diphenyl Ethers in Aquatic Species from the Typical E-Waste Burning Site

Bioaccumulation of polybrominated diphenyl ethers was investigated using aquatic species collected from a pond in an e-waste burning site in South China. The levels of PBDEs ranged from 0.2487to 24.50μg/g (lipid weight) in the bodies of aquatic organisms including shrimp, river snail, mussel, crucian, carp, monopterus and snakehead. In this study, the highest levels of PBDEs were investigated in mussel (Anodonta) and river snail (Cipangopaludina cathayensis), which were 11.38and 4.968μg/g, respectively. Compared with previous studies, the results showed that the PBDE levels of aquatic species were 1to 3orders of magnitude higher than that reported in other regions of China. This indicated that heavy PBDE pollution occurred in this area. BDE209was the most dominant congener (49.83%-91.48%) of PBDEs in these investigated aquatic organisms. In addition, relatively higher levels of octa-BDE and nona-BDE were also detected in the aquatic species. Based on the results, trophic level is the main controlling factors for PBDE bioaccumulation. Meanwhile, the feeding and living habits also play important roles in the PBDE accumulation in the aquatic organisms, especially in mollusks.