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- E-ISSN 2288-8985
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Examination of GC-TD sensitivity for reduced sulfur compounds in relation to temporal stability and reproducibility
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2010, v.23 no.1, pp.24-35
https://doi.org/10.5806/AST.2010.23.1.024
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(2010). Examination of GC-TD sensitivity for reduced sulfur compounds in relation to temporal stability and reproducibility. Analytical Science and Technology, 23(1), 24-35, https://doi.org/10.5806/AST.2010.23.1.024
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Abstract
To learn more about the calibration properties of reduced sulfur compounds (RSCs) by the combination of gas chromatography(GC)-pulsed flame photometric detector (PFPD) and thermal desorption method, a series of calibration experiments were conducted on the basis of both internal and external calibration approaches. For these experiments, gaseous standards of 4 RSCs (H2S, CH3SH, DMS, and DMDS) were prepared at two different concentration levels of both low (10, 20, 50,and 100 ppb) and high ranges (100, 200, 500, and 1000ppb) along with CS2 as an internal standard. First, the external calibration results were compared between fixed standard volume (FSV) and fixed standard concentration (FSC) method. Secondly, FSV-based calibration results were compared between external and internal calibration results. As FSV method suffers from sensitivity variations less significantly than FSC, the former is recommended to maintain the consistency in GC-TD sensitivity for RSC analysis. In addition, when the calibration data were examined in terms of RSE between external and internal calibration data, the results were not consistent enough to show improvements in internal method. Hence, diverse efforts are desirable to optimize the reproducibility in terms of GC-TD sensitivity for RSC analysis.
- keywords
- Reduced sulfur compounds, external calibration, internal calibration, internal standard, FSC, FSV
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