Group determination of polychlorinated biphenyls, dibenzofurans, dihenzodioxines based on catalytic hydrodechlorination and gas chromatography of reaction products

摘要

On the example of decachlorbifphenyl (DCB), octachlordibenzofuran (OCDF); octachlordibenzodioxin (OCDD) the possibility of catalytic hydrodechlorination of small quantities (10~(-9)-10~(-8) g) of polychloric biphenyls (PCB), polychlorinated dibenzofurans (PCDF), polychlorinnated dibenzodioxines (PCDD) is shown The level of determination is decreased by using photo-ionization detector and introducing big volumes of organic solutions without solvent into the gas chromatography system. The method allows to determine the total content of PCB, PCDF, PCDD in organic solutions at 10~(-7)-10~(-8) percent level and 2-3 orders lower in extracts. Conditions of selective separation of biphenyl, dibenzofuran, dibenzodioxin from PCB, PCDF, PCDD are chosen.