[Levels of PCDD/Fs and dioxin-like PCBs in soils near E-waste dismantling sites].
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 x g(-1) to 7 010 pg x g(-1) dry weight with the mean value of 1 380 pg x 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 x g(-1) to 94.8 pg x 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.
Zhejiang Province Environmental Monitoring Center, Hangzhou 310012, China. shock1224@126.com
Ke
K
Shao
Zhejiang Province Environmental Monitoring Center, Hangzhou 310012, China.
Wen-Hua
WH
Yin
Zhejiang Province Environmental Monitoring Center, Hangzhou 310012, China.
Guo-Hua
GH
Zhu
Zhejiang Province Environmental Monitoring Center, Hangzhou 310012, China.
Hong-Ping
HP
Gong
Zhejiang Province Environmental Monitoring Center, Hangzhou 310012, China.
Xin
X
Zhou
Zhejiang Province Environmental Monitoring Center, Hangzhou 310012, China.
Ling
L
Wang
Zhejiang Province Environmental Monitoring Center, Hangzhou 310012, China.
Jin-Song
JS
Liu
D001572:Benzofurans / Q000032:analysis*; D000072338:Dibenzofurans, Polychlorinated; D004147:Dioxins / Q000032:analysis*; D059029:Electronic Waste; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*
D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D004147:Dioxins; D000072317:Polychlorinated Dibenzodioxins; D012987:Soil; D012989:Soil Pollutants; D011078:Polychlorinated Biphenyls; C020887:dibenzo(1,4)dioxin