| 电子垃圾拆解地表层土壤中的多卤代芳烃及其潜在污染源 |
| 摘要点击 1798 全文点击 2409 投稿时间：2008-07-09 修订日期：2008-10-28 |
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| 中文关键词 电子垃圾 土壤 多溴联苯 多溴联苯醚 多氯联苯 |
| 英文关键词 e-waste soil PBBs PBDEs PCBs |
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| 中文摘要 |
| 通过收集典型电子垃圾拆解区的电子垃圾碎屑以及拆解现场和对照区的表层土壤（0～5 cm深度）样品.采用GC/MS 5975B对样品中PHAHs进行分析.结果发现，在采集的三大类电子垃圾碎屑中电缆绝缘层含有最高浓度的PBBs（35.25 ng·g-1），其中以PBB2、PBB3和PBB15为主的低溴代联苯占到总量的38%.电子元件填充物中的∑PBDEs和PBDE209检出浓度最高，分别为29.71 ng·g-1和4.19×103 ng·g-1；PBDE153和PBDE183是最具支配地位的同族体，分别占PBDEs总量的43%和24%.电缆绝缘层中的PCBs浓度在所收集的电子垃圾碎屑中最高（680.02 ng·g-1）.拆解现场表层土壤中PHAHs的污染特征与电子垃圾碎屑中PHAHs的污染特征相一致，而且其污染水平明显高于对照区土壤相应PHAHs的浓度水平.表明电子垃圾中PHAHs是当地土壤环境的重要污染源. |
| 英文摘要 |
| Soil samples (each with 3 replicates of～1 kg，at the top 0 5 cm layer) were collected from each of the e waste disassembly sites and the control site. Also obtained from each disassembly site were samples (each weighing ～0.2 kg) of cable coating，stuffing powder，and circuit boards chipping. The contents of 23 PBB congeners，12 PBDE congeners，and 27 PCB congeners in soil and in their potential sources，including e waste residues，were measured using the GC MS5975B technique. The highest level of PBBs was found in the cable coating among the three e waste residues，with a concentration of 35.25 ng·g-1. The contents of low brominated PBBs (including monobromobiphenyls and dibromobiphenyls) accounted for 38% of the total PBBs concentration observed in cable coating sample. The highest levels of PBDEs and PBDE209 were found in the stuffing powder for electronic component among the collected e waste residues，with a concentration of 29.71 and 4.19×103 ng·g-1. PBDE153 and PBDE183 were the most predominant PBDE congeners，with their concentration accounting for 43% and 24% of the total PBDEs concentration observed in the stuffing powder sample，respectively. Levels of PCBs in cable coating were the highest in these e waste residues，with a concentration of 680.02 ng·g-1. The observed values of the three PHAHs in soils from the disassembly site were considerably higher than their corresponding values observed in the control site (p<0.05)，which indicates that these PHAHs from e waste is the pollution source of local environment. |
