Detailed analysis of PCBs and PCDD/Fs impurities i

Authors: Jun Huang Yamei Hui Toru Matsumura Gang Yu Shubo Deng Makoto Yamauchi Changmin Wu Norimasa Yamazaki

Publish Date: 2013/07/15

Volume: 8, Issue: 2, Pages: 195-204

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Abstract

Homolog and congener profiles of polychlorinated biphenyls PCBs polychlorinated dibenzopdioxins PCDDs and polychlorinated dibenzofurans PCDFs in commercial PCBs formulations are useful information for the source appointment of PCBs contamination as well as the risk assessment caused by potential exposure Dielectric oil ASKAREL Nr 1740 in an imported transformer found in China was sampled and analyzed by isotope dilution technology using high resolution gas chromatographyhigh resolution mass spectrometry HRGC/HRMS The detailed homolog and congener profiles of PCBs obtained were compared with those of known Aroclor formulations High similarity in the homolog profile between the oil sample and Aroclor 1260 was found with the hexachlorinated and heptachlorinated biphenyls accounting for more than 802 of the total PCBs concentration Severn indicator PCBs contribute about 30 while 12 PCB congeners ie 153 143 168 180 149 165 138 170 190 187 174 181 account for more than 50 of the total PCB concentrations Total concentration of PCDDs PCDFs and dioxinlike PCBs DLPCBs was found to be 740 ng TEQ/g of which 620 ng TEQ/g came from DLPCBs The contribution of PCDDs to the total TEQ was neglectable The concentration of PCDFs homologs follows the order of OCDFHxCDFsHpCDFsPeCDFsTeCDFs which is in consistence with the previous study on Aroclor 1260 Three DLPCBs congeners ie 118 156 157 accounted for 77 of the total concentration of DLPCBs also they contribute 72 in the TEQ caused by DLPCBs

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