Journal
MICROCHEMICAL JOURNAL
Volume 91, Issue 1, Pages 40-46Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.microc.2008.07.004
Keywords
Reduced sulfur compounds; Calibration; Pulsed flame photometric detection; Thermal desorption
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Funding
- Korea Research Foundation [KRF-2005-201-C00045]
- Korean government (MOEHRD)
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In this study, the reliability of thermal desorbing technique was investigated using the gaseous standards of five reduced sulfur compounds (RSCs: hydrogen sulfide. methane thiol, dimethyl sulfide, carbon disulfide, and dimethyl disulfide). A series of calibration experiments for RSCs were performed using gas chromatography (GC) with pulsed flame photometric detector (PFPD) that is interfaced with a thermal desorber (TD) unit. These calibration data were evaluated by means of two contrasting concepts: fixed standard concentration method (FSC: variable volumetric injection of standard gases prepared at a given concentration) and fixed standard volume method (FSV: injection of multiple standards with varying concentrations at a given volume). When the results of both methods were compared, RSCs generally showed enhanced sensitivity with increasing concentration (FSC) and sample loading volume (FSV). This study highlights that TD-based calibration properties are practically undistinguishable between different sample transfer approaches (e.g., FSV and FSC). As a result, the calibration properties of RSCs derived by thermal desorption technique are greatly distinguished from those of direct injection into GC. (C) 2008 Elsevier B.V. All rights reserved.
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