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Changes in the gas chromatographic sensitivity with its analytical setting: Comparison of TDU and loop-injection system for the analysis of sulfur compounds  

Kim, Ki-Hyun (Atmospheric Environment Laboratory, Department of Earth & Environmental Science, Sejong University)
Choi, Y.J. (Center for Environmental Research, Kyung Hee University)
Kim, S.C. (School of Civil and Environmental Engineering, Kunsan National University)
Publication Information
Analytical Science and Technology / v.18, no.1, 2005 , pp. 66-73 More about this Journal
Abstract
In this study, we investigated the gas chromatography (GC) and pulsed flame photometric detection (PFPD) system for the analysis of four major reduced S compounds including hydrogen sulfide ($H_2S$); methyl mercaptan ($CH_3SH$); dimethyl sulfide (DMS); and dimethyl disulfide (DMDS) contained in environmental samples. To analyze these compounds in high concentration range (above ppb level), we developed a high mode analytical setting with the loop-injection system. By contrast, we also established a low mode setting for the analysis of low concentration samples (ppt-level samples from ambient air) by the combination with thermal desorption unit (TDU). Comparative analysis of both settings revealed that relative detection properties of four S compounds are systematic enough. The results of high mode analysis indicated that the patterns were systematic among S compounds: $H_2S$ exhibited the lowest sensitivity, while DMDS showed the strongest one. The results were also compared in terms of sensitivity reductions for all compounds by dividing slope ratios between low and high mode system. Although low mode system exhibited significant reductions on the order of a few tens times, their detection characteristics were highly consistent as it was shown in the high mode setting. To learn more about absolute and relative relations between two different modes of S analysis, future studies may have to be directed to cover more complicated nature of GC/PFPD performance.
Keywords
Hydrogen sulfide; detection; malodor; PFPD detection; high mode; Low mode;
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