Analysis Method of PCBs in transformer oil and distribution characteristic of PCB-congeners before and after chemical treatment of waste transformer oil contaminated PCBs

摘要

In this study, the clean-up method of polychlorinated biphenyls (PCBs) in waste transformer oil were compared Korea Standard Test Method (KSTM) with Japanese Industrial Standard (JIS) and the PCBs concentrations in waste transformer oil were compared by gas chromatography/electron capture detector (GC/ECD) for analysis of peak patter with by high resolution gas chromatography/ high resolution mass spectrometer (HRGC/HRMS) for analysis of 209 congeners. And also the distribution characteristic of PCBs congeners before and after chemical treatment of waste transformer oil contaminated PCBs was investigated. The clean-up method without reverse extraction using dimethylsulfoxide (DMSO) was more effective than the clean-up method with reverse extraction using DMSO. After than the alkali dissolve, sulfuric acid, silica-gel and florisil column were used for clean-up. The PCBs concentrations in waste transformer oil were 6-23% higher by HRGC/HRMS for analysis of 209 congeners than by GC/ECD for analysis of peak patter. The distribution characteristic of PCBs congeners before chemical treatment of waste transformer oil contaminated PCBs showed Cl5-Cl7 compounds higher than Cl2-Cl4 compounds, but after chemical treatment of waste transformer oil contaminated PCBs showed Cl2-Cl4 compounds higher than Cl5-Cl7 compounds usually. Therefore it could be find out that the congener distribution of PCBs before and after chemical treatment of waste transformer oil contaminated PCBs was very different.