Pollution characteristics of polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans and polychlorinated biphenyls in PM2.5 of Hangzhou City during winter

doi:10.3724/SP.J.1123.2014.05023

Abstract

Abstract:

In order to evaluate the distributions and concentrations of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and polychlorinated biphenyls (PCBs) in aerosol, PM_2.5 samples were collected concurrently at five sites in January 2014 in Hangzhou. The analytes were analyzed with isotope dilution and high resolution gas chromatography/high resolution mass spectrometry (HRGC/HRMS) based on US EPA 1613B method and US EPA 1668B method. The results showed that the mass concentrations of PM_2.5 were in the range of 85-168 μg/m³, which were much higher than the national quality standard. The values suggested that the PM_2.5 pollution was relatively serious in Hangzhou City, yet it has been improved when compared with the results of 2004. The toxic equivalent quantities (TEQs) of PCDD/Fs in PM_2.5 were in the range of 0.277-0.488 pg I-TEQ/m³, which were much higher than the results in 2004. Octachlorodibenzo-p-dioxin(OCDD) accounted for a large proportion to the total concentrations in PCDD/Fs, while 2,3,4,7,8-pentachlorodibenzofurans (2,3,4,7,8-PeCDF) contributed the highest to the TEQ. The values of PCBs and dioxin-like PCBs (DL-PCBs) varied from 2.9-8.1 pg/m³ and 2.6-6.1 fg WHO-TEQ/m³, respectively. PCB-28 was the most abundant contributor to the concentrations of PCBs, while PCB-126 contributed the highest to the TEQ of DL-PCBs. Gas-particle distributions of PCDD/Fs and PCBs shows that PCDD/Fs were mainly distributed in the particle phase, but PCBs were preferably adsorbed in the gas phase.

Key words: high resolution gas chromatography/high resolution mass spectrometry (HRGC/HRMS), PM_2.5, pollution characteristics, polychlorinated biphenyls (PCBs), polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs)

CLC Number:

O658

LI Mufei, LIU Jinsong, ZHOU Xin, ZHU Guohua, GONG Hongping, CHEN Bei, WANG Ling, SUN Junjun. Pollution characteristics of polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans and polychlorinated biphenyls in PM_2.5 of Hangzhou City during winter[J]. Chinese Journal of Chromatography, 2014, 32(9): 948-954.

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Pollution characteristics of polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans and polychlorinated biphenyls in PM_2.5 of Hangzhou City during winter

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