Distribution of polychlorinated dibenzo-p-dioxins and dibenzofurans in ambient air of different regions in China |
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Authors: | Tong Chen Xiaodong Li Jianhua Yan Shengyong Lu Kefa Cen |
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Institution: | State Key Laboratory of Energy Clean Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China |
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Abstract: | Levels of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were determined in fourteen ambient air samples collected in twelve cities of five provinces and one large municipality in China. The PCDD/F concentrations varied from 2.6 to 120 pg m−3 (or from 0.04 to 1.93 pg I-TEQ m−3). Generally, TCDF was the dominant homologue group and as a rule the homologue concentration of PCDF decreased with rising chlorine substitution number of PCDF. In all cases 2,3,4,7,8-PeCDF was the most important contributor to the I-TEQ value, accounting for 35–57% of the total I-TEQ value. Higher PCDD/F levels in ambient air were found during winter. The highest PCDD/F levels were found in Chengdu, Sichuan Province. In general, the PCDD/F levels in this study were in the same range as in other studies in China. |
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Keywords: | PCDD/Fs Ambient air Homologue profile Congener profile China |
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