| 电子垃圾拆解地周边土壤中二(口恶)英和二(口恶)英类多氯联苯的浓度水平 |
| 摘要点击 4312 全文点击 1821 投稿时间：2013-02-22 修订日期：2013-05-27 |
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| 中文关键词 拆解 二(口恶)英 多氯联苯 土壤 主因子分析 |
| 英文关键词 dismantling PCDD/Fs PCBs soil principle component analysis (PCA) |
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| 中文摘要 |
| 采集了电子垃圾拆解地周边125个点位的151个土壤样品,分析了土壤中4~8氯代二(口恶)英和二(口恶)英类多氯联苯的浓度. 表层土壤样品中总二(口恶)英的浓度范围为280~7010 pg·g-1,平均浓度为1380 pg·g-1. 中层和深层土壤样品中总二(口恶)英的平均浓度分别为表土的63%和38%. 表土样品中二(口恶)英毒性当量浓度(以I-TEQ计)范围为1.4~94.8 pg·g-1. 根据德国关于毒性当量浓度的指导方针,125个土壤样品中只有19个(15%)可以被认为对人体健康无害,其余85%的土壤需要调查二(口恶)英的来源. 如果考虑多氯联苯对毒性当量的贡献,则有98%的土壤需要调查二(口恶)英的来源. 主因子分析被用来调查这一地区二(口恶)英的排放源. 通过对土壤中二(口恶)英的同系物分布进行分析,发现拆解活动是这一地区热过程二(口恶)英的主要排放源,也是这一地区土壤中二(口恶)英的主要来源. |
| 英文摘要 |
| One hundred and fifty one soil samples from 125 sampling points were collected near E-waste dismantling sites and analyzed for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (PCBs). Total concentration of PCDD/Fs in topsoil samples ranged from 280 pg·g-1 to 7010 pg·g-1 dry weight with the mean value of 1380 pg·g-1 dry weight. The mean value of the second layer and the deepest layer is 63% and 38% of that of top soils, respectively. The toxic equivalent quantity (TEQ) of PCDD/Fs in top soils ranged from 1.4 pg·g-1 to 94.8 pg·g-1(I-TEQ). According to the guidelines for TEQ concentrations established in Germany, 19 of 125 topsoil samples (15% of the total topsoil samples analyzed) could not be expected to pose human health hazards. The rest of 85% of top soils needs investigations of source identification. If the contribution of PCB to TEQ was considered, 98% of top soils need investigations of source identification. Principle component analysis (PCA) is used to identify the PCDD/Fs sources. The homologue profiles of PCDD/Fs showed that dismantling activities are the main emission resources of the PCDD/Fs from thermal processes, also are the main emission resources of the PCDD/Fs in soils of this area. |
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