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Hexachlorobenzene (HCB) and pentachloorbenzene (PeCB) are banned globally as POPs under the Stockholm Convention. Those are still emitted as a by-product from certain industrial activities such as waste incinerations,metal production etc and are undergone long-range atmospheric transport. It is difficult to identify the sources of those compounds due to the varieties of point sources. Recently, studies on stable isotopes of POPs have been carried out to get more information about the sources. In this study, the carbon isotopes of HCB and PeCB were analyzed using EA-IRMS (elemental analyzer - isotope ratio mass spectrometry) to examine the possibilities of application as a tracer for POPs sources. The carbon isotopic ratios of both HCB and PeCB were obtained through the EA-IRMS. The isotopic ratios of the standards produced from two different manufactures were compared. The δ13C values of HCB ranged from -26.05‰ to -25.28‰, and those of PeCB ranged from -29.20‰ to -29.19‰. The relative standard deviations were less than 0.24% for EA-IRMS analysis of carbon isotopes and the difference between the value of cross-product manufacturing company appeared.

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