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The Selection of Sample Injection Modes and Its Effect on the Calibration Bias in S Gas Detection by Gas Chromatography  

Kim Ki-Hyun (Atmospheric Environmental Laboratory, Department of Earth & Environmental Sciences, Sejong University)
Choi YJ (Center for Environmental Research, Kyung Hee University)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.21, no.2, 2005 , pp. 269-274 More about this Journal
Abstract
In this work, analytical bias arising from the gas chromatographic determination of sulfur compounds was evaluated by the application of direct loop injection method to the GC/PFPD detection of four sulfur compounds including H$_{2}$S, CH$_{3}$SH, DMS, and DMDS. For the proper evaluation of analytical uncertainties involved in GC calibration, we employed two comparative techniques of calibration at fxed concentration injection (CFCI) vs calibration at fixed volume injection (CFVI) method. The results of our study indicate that CFCI method exhibits very poor sensitivity due to the matrix effect with varying injection volumes. On the other hand, as CFVI method overcomes such limitation, it can be used to obtain very accurate quantification of S compounds at their high concentration levels above a few to a few tens ppb.
Keywords
GC; PFPD; Hydrogen sulfide; Malodor; Calibration error;
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