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Determination of Volatile Organic Compounds emitted from Municipal Solid Waste Landfill Site by Thermal Desorption-Cryofocusing-GC/FID/FPD
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2001, v.14 no.3, pp.274-285
Kim,
M., Jung,
Y., Seo,
Y., Nam,
S., &
Kwon,
Y.
(2001). Determination of Volatile Organic Compounds emitted from Municipal Solid Waste Landfill Site by Thermal Desorption-Cryofocusing-GC/FID/FPD. Analytical Science and Technology, 14(3), 274-285.
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Abstract
In this study, the thermal desorption-cryofocusing-gas chromatographic(TD-C-GC) method was developed for determination of volatile organic compounds(VOCs) in ambient air and was applied at the municipal solid waste landfill sites. On-column cryofocusing was possible only with a 100 ml dewars bottle in TD-C-GC method with a stainless steel column. However, high operating pressure was needed for purging VOCs from the absorbent trap, which was able to solve by pressure programming with a electric pressure controller. By using both pressure and temperature programming brought increasing of resolution power in on-column cryofocusing method, but the high pressure caused a leakage of sample tube with repeated use. A loop cryofocusing devise was also developed and compared with the direct on-column method. In loop cryofocusing method, VOCs were concentrated on a 0.8mm i.d. loop which is located between the injector and separation column by using liquid nitrogen. In order to purge VOCs from the absorbent trap, only 0.4 psi of pressure was need in the loop cryofocusing method. Dual detection system was applied for the analysis of VOCs; a FID was used for hydrocarbons and a FPD was used for sulfur-containing compounds. Qualitative analysis was done by on-column cryofocusing GC-MS system. Among the large number of VOCs, toluene was the most abundant. Hydrogen sulfide, dimethyl sulfide, carbon disulfide, dimethyl disulfide and methyl propyl disulfide were detected at landfill site by FPD.
- keywords
- landfill, VOC, theramal desorption-cryofocusing-GC/FID/FPD
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