Analytical Science and Technology (분석과학)

The Korean Society of Analytical Sciences (한국분석과학회)
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A review of analytical method for volatile fatty acids as designated offensive odorants in Korea

악취성 유기지방산 성분의 분석기술

  • 안지원 (세종대학교 환경에너지융합학과) ;
  • 김용현 (세종대학교 환경에너지융합학과) ;
  • 김기현 (세종대학교 환경에너지융합학과) ;
  • 송희남 (에이스엔)
  • Received : 2012.02.14
  • Accepted : 2012.02.29
  • Published : 2012.04.25
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Abstract

A list of volatile fatty acids (VFA) including propionic acid, butyric acid, isovaleric acid, valeric acid, etc. is well known for offensive odorants. The analysis of odorant VFA is a highly delicate task due to high reactivity and unstable recovery rate. At present, analytical methods of VFA are recommended to include alkali impregnation filter method and alkali absorption method by the malodor prevention law of the Korea Ministry of Environment (KMOE). In this review, a survey has been made to explore various approaches available for the analysis of VFA to include both official methods of the KMOE and others. In light of the unreliability of those established analytical methods, it is highly desirable to develop some substituting methods for VFA. Among such options, one may consider such option as sorbent tube (ST) sampling and cryogenic trapping-thermal desorption technique. Moreover, procedures used for standard preparation, sampling steps, and instrumental detection stage are also evaluated. Application of container sampling (like Tedlar bag) is however not recommendable due to significant (sorptive) loss in sampling and in storage stage. In the detection stage, the use of GC/MS is recommendable to replace GC/FID due to the presence of diverse interfering substances. Thus, it is essential to properly establish the basic quality assurance (QA) for VFA analysis in air.

2010년부터 지정악취물질로 관리 중인 유기지방산은 큰 반응성과 그에 따른 낮은 회수율 등의 문제로 인해, 분석이 난해한 성분으로 알려져 있다. 악취공정시험기준에서는 대기 중에 존재하는 유기지방산을 분석하는 방법으로 알칼리함침필터법과 알칼리흡수용액법을 제시하고 있다. 본 연구에서는 유기지방산의 분석기법을 전반적으로 비교검토하였다. 그러나 이들 지정분석방법에 대한 객관적인 검증이 쉽지않다는 점을 감안할 때, 유기지방산의 새로운 대안 분석방안으로 고체흡착관-저온농축탈착법 등을 고려할 필요가 있다. 고체흡착관으로 시료를 채취하고 저온농축열탈착기를 이용하여 분석할 경우, 공정시험기준상에 제시한 분석방법들에 비해 상당히 간편하고 검정이 용이하다는 이점이 있다. 본 연구에서는 이러한 분석방법에 대한 고찰에 덧붙여, 표준시료의 준비, 시료의 채취단계, 최종적인 검출단계에 대한 부분에 대해서도 검토하였다. 유기지방산의 현장시료를 채취 및 분석하기 위해서, 용기채취법의 적용은 심각한 오차를 수반할 수 있다는 점을 확인하였다. 또한 현장에서 채취한 시료의 유기지방산을 분석할 때, GC/FID에 의존할 경우, 여러 가지 간섭 성분의 영향을 배제하기 어렵다. 따라서 유기지방산의 분석에는 GC/MS를 이용하여 정량뿐 아니라 정성적인 부분까지 동시에 검토하는 것이 중요하다.

Keywords

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