Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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A Study on the Development of Soil-based PTMs for Analysis of BTEX

BTEX 분석용 토양 숙련도 표준시료(PTMs) 개발에 관한 연구

  • Lee, Minhyo (National Instrumentation Center for Environmental Management, Seoul National University) ;
  • Lee, Guntaek (National Instrumentation Center for Environmental Management, Seoul National University) ;
  • Lee, Bupyoel (National Instrumentation Center for Environmental Management, Seoul National University) ;
  • Lee, Wonseok (National Institute of Environmental Research) ;
  • Kim, Gumhee (National Institute of Environmental Research) ;
  • Hong, Sukyoung (National Institute of Environmental Research)
  • 이민효 (서울대학교 농생명과학공동기기원) ;
  • 이군택 (서울대학교 농생명과학공동기기원) ;
  • 이법열 (서울대학교 농생명과학공동기기원) ;
  • 이원석 (국립환경과학원) ;
  • 김금희 (국립환경과학원) ;
  • 홍석영 (국립환경과학원)
  • Received : 2013.05.30
  • Accepted : 2013.08.07
  • Published : 2013.10.31
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Abstract

In this study, two kinds of soil-based proficiency testing materials (PTMs), NICE-012L and NICE-012R were prepared and certified for Benzen, Toluene, Etylbenzene and Xylene with evaluation of uncertainties. In order to analyse BTEX (Benzen Toluene Etylbenzene Xylene) for the candidate materials, GC/MS was used after pretreatment according to methods of soil analysis by Ministry of Environment. For the homogeneity test among bottles in terms of candidate materials, ISO 13528 and IUPAC Protocol were used and according to the result, both candidate materials showed sufficient homogeneity. Also, the stability test over the candidate materials was accessed according to the ISO Guide 35 by classifying short-term and long-term stability and the result showed that both candidate materials showed decent stability. The reference values of the two candidate materials depending on BTEX components were derived from the average of the 11 samples that were used for verification of the samples' homogeneity. Uncertainty of measurement was combined by uchar that was caused by a characteristic value, $u_{bb}$ that was caused by between-bottle homogeneity, and $u_{stab}$ that was caused by stability, and then combined uncertainty ($u_{PTM}$) was multiplied to the coverage factor (k) derived from the effective degree of freedom from each factor that leads to expanded uncertainty (U) in about 95% of confidence level. The proficiency testing materials developed through this study were supplied to National Institute of Environmental Research (NIER) and utilized as an external proficiency testing materials for evaluating analysis capacity of soil agencies with specialty in terms of soil analysis approved by Minister of Environment.

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References

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