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氯代二嗯英和二嗯英类多氯联苯的浓度-表层土壤样品中总二嗯英的浓度范围为280～7010Pg·g-1，平均浓度为1380Pg·g-1．中层和深层土壤样品中总二嗯英的平均浓度分别为表土的63％和38％．表土样品中二嚼英毒性当量浓度（以I-TEQ计）范围为1．4～94．8Pg·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％的土壤需要调查二嗯英的来源．如果考虑多氯联苯对毒性当量的贡献，则有98％的土壤需要调查二嗯英的来源．主因子分析被用来调查这一地区二呱英的排放源．通过对土壤中二嗯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嚼英的主要排放源。也是这一地区土壤中二嚼英的主要来源．
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-1to 7 010 pg-g-1 dry weight with the mean value of 1 380 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.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第11期4434-4439,共6页
Environmental Science
基金
浙江省重大科技专项(2009C13004)
国家高技术研究发展计划(863)项目(2011AA060604)
浙江省环境保护科技项目(2012A038)
关键词
拆解
二噁英
多氯联苯
土壤
主因子分析
dismantling
PCDD/Fs
PCBs
soil
principle component analysis （PCA）
