Abstract
On the analysis of polychlorinated biphenyls (PCBs) in electrical insulation oils which contain polychlorinated naphthalenes(PCNs), there could be quantitative error from PCNs, because of their high sensitivity in gas chromatograph/electron capture detector (GC/ECD). Thus, we have developed the PCN trap method which can remove PCNs selectively by carbon fiber. Although PCNs could be removed by this method, non-ortho PCBs and a part of mono-ortho PCBs also could be removed. But, KC-Mix in insulation oils have a little of PCBs which could be removed by the PCN trap method, and their influence on total concentration is low. We showed that the PCN trap method had comparable performance to the conventional method. In addition, we performed experiment for JIS 1 ∼ JIS 7 oils and DOP which were spiked PCN and PCB standards mixture and PCN-containing insulating oils. The results indicated that the PCN trap method were more accurate than the conventional method.
