Determination of Polychlorinated Biphenyls in Water Samples Using Automated Solid Phase Extraction and Molecular Sieve Dehydration Coupled with Gas Chromatography/Mass Spectrometry

Automated solid phase extraction and molecular sieve dehydration coupled with gas chromatography/mass spectrometry(GC/MS) were used to determine the residues of polychlorinated biphenyls (PCBs) in water samples. Using ethylacetate and dichloromethane as the extraction agent and C-18 disk as the extraction disk, extracting liquid was dehydrated by molecular sieve dehydration and concentrated to 1 mL by nitrogen purging. By using PCB209 as a substitute and phenanthrene-D10 as internal standard, selected ion mode was used for the analysis of samples. The proposed method has been applied for the determination of PCBs residues in drinking water and industrial wastewater. The average recoveries were between 80% and 115% with RSD of 0.7%-19.2% (n = 3). The limits of detection was between 1.4x10(-6)-6.8x10(-6) mg/L and the correlation coefficient of the method (R-2) was 0.9988-0.9999.