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KMID : 0385520120250020091
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Analytical Science & Technology
2012 Volume.25 No. 2 p.91 ~ p.101
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A review of analytical method for volatile fatty acids as designated offensive odorants in Korea
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Ahn Ji-Won
Kim Yong-Hyun
Kim Ki-Hyun
Song Hee-Nam
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Abstract
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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 trappingthermal 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.
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KEYWORD
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volatile fatty acid (VFA), malodor prevention law of the Korea Ministry of Environment, sorbent tube (ST), cryogenic trapping-thermal desorption, liquid-phase standard,
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