Contamination level and congener profiles of PCBs, Co-PCBs and PCDD/DFs in transformer insulation oil samples

변압기 절연유 중 PCBs, Co-PCBs 및 PCDD/PCDFs 오염수준 및 이성체 분포

  • Kim, Kyoung-Soo (Department of Environmental Engineering, Cheongju University) ;
  • Kim, Jong-Guk (Center for Chemical Safety Management, Chonbuk National University) ;
  • Shin, Sun-Kyoung (Resource Recirculation Division, National Institute of Environmental Research) ;
  • Kim, Kyoung-Sim (Center for Chemical Safety Management, Chonbuk National University) ;
  • Song, Byung-Joo (Center for Chemical Safety Management, Chonbuk National University)
  • 김경수 (청주대학교 환경공학과) ;
  • 김종국 (전북대학교 화학물질안전관리연구센터) ;
  • 신선경 (국립환경과학원 자원순환과) ;
  • 김경심 (전북대학교 화학물질안전관리연구센터) ;
  • 송병주 (전북대학교 화학물질안전관리연구센터)
  • Received : 2006.04.24
  • Accepted : 2006.05.25
  • Published : 2006.06.27

Abstract

The levels of total PCBs, Co-PCBs and PCDD/Fs in the transformer insulation oil samples obtained using GC/ECD and HRGC/HRMS were ranged from N.D. to 77.3 ppm, from 0.0863 to 2.49 ppm and from N.D. to 0.00241 ppm, respectively. In terms of WHO-TEQ values, Co-PCBs and PCDD/Fs were ranged from 23.3 to 600 pgTEQ/g and from N.D. to 128 pgTEQ/g, respectively (${\Sigma}Co$-PCBs+PCDD/Fs concentration was calculated 24.4~728 pgTEQ/g). Although, the contribution of PCDD/Fs was below 12% in total TEQ concentration, it is suggested contamination of PCDD/Fs in transformer insulation oils. Among 10 samples, 4 samples showed higher concentration than 2 ppm (specific waste criterion of Korea) and Aroclor 1242, 1248, 1254 and 1260 was detected in samples as a single or mixture of Aroclor. It was shown reliable relationship between concentration of Co-PCBs and those of PCDD/Fs (p<0.003), however, was not shown between production year of transformer and concentration of PCBs. The distribution pattern of Co-PCB congeners showed that the ratios of mono-ortho substituted congeners were higher than non-ortho substituted congeners. Among that, PCB-118 congener was predominant. In addition, the OCDD congener was predominated in PCDD/Fs congeners as above 53%. Moreover, the congener pattern of Co-PCBs was similar to that of Aroclor as well as ambient air, which suggested that PCBs volatilization from transformer insulation oil affected the pattern of Co-PCBs in ambient air.

Acknowledgement

Supported by : 환경부

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