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- E-ISSN 2288-8985
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A study on the calibration characteristics of organic fatty acids designated as new offensive odorants by cryogenic trapping-thermal desorption technique
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2009, v.22 no.6, pp.488-497
(㈜ITC21)
(ITC21)
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(2009). A study on the calibration characteristics of organic fatty acids designated as new offensive odorants by cryogenic trapping-thermal desorption technique. Analytical Science and Technology, 22(6), 488-497.
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Abstract
In this study, analytical methodology for several organic fatty acids (OFA: propionic acid (PA), butyric acid (BA), isovaleric acid (IA), and valeric acid (VA)) designated as new offensive odorants in Korea (as of year 2010) was investigated along with some odorous VOCs (styrene, toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, butyl acetate, and isobutyl alcohol). For this purpose, working standards (WS) containing all of these 13 compounds were loaded into adsorption tube filled with Tenax TA, and analyzed by gas chromatography (GC) system thermal desorber interfaced with. The analytical sensitivities of organic fatty acids expressed in terms of detection limit (both in absolute mass (ng) and concentration (ppb)) were lower by 1.5~2 times than other compounds (PA: 0.24 ng (0.16 ppb), BA: 0.19 ng (0.11 ppb), IA: 0.15 ng (0.07 ppb), and VA: 0.28 ng (0.13 ppb)). The precision of BA, IA, and VA, if assessed in terms of relative standard error (RSE), maintained above 5%, while the precison of other compounds were below 5%. The reproducibility of analysis improved with the aid of internal standard calibration (PA: 1.1±0.4%, BA: 10±0.46%, IA: 12±0.3%, and VA: 4±0.1%), respectively. The results of this study showed that organic fatty acid can be analyzed using adsorption tube and thermal desorber in a more reliable way to replace alkali absorption method introduced in the odor prevention law of the Korea Ministry of Environment (KMOE)
- keywords
- organic fatty acid, offensive odorants, thermal desorber, Tenax TA, internal standard
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