Study of using an Online GPC/GC for Simplified Automated Analysis of Low Concentrations of PCBs in Insulating Oil

概要

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A simple and precise analytical method is needed for checking insulating oil contaminated with low concentrations of PCBs. Conventional methods for the analysis of PCB-contaminated insulating oil samples require long pretreatment time with highly skilled technicians. The aim of the present study was to develop a simplified automated analytical method that would reduce the amount of labor required for analyzing low concentrations of PCBs in insulating oil. An online GPC/GC was built using an existing HPLC and a GC. After optimization of analytical conditions of the automated GPC/GC system by using standard PCB solution, standard-added waste insulating oils were pretreated with sulfuric acid and analyzed. Repeatabilities (RSD) of the analysis of PCB-containing waste oil at 0.5 mg/kg were from 3.3 % to 6.8 %, and the method detection limit (3 σ) and the method quantification limit (10σ) were 0.1 mg /kg and 0.34 mg/kg, respectively. Good stability and reliability of the analysis was shown in the repeated analysis of 137 samples for one week, confirming applicability of the system for insulating waste oils contaminated with low concentrations of PCBs.
日本環境化学会の論文