Bulletin of the Korean Chemical Society

  • 제25권1호
  • /
  • Pages.73-78
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  • 2004
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Molecular Emission Spectrometric Detection of Low Level Sulfur Using Hollow Cathode Glow Discharge

  • Koo, Il-Gyo (Department of Molecular Science and Technology, Ajou University) ;
  • Lee, Woong-Moo (Department of Molecular Science and Technology, Ajou University)
  • 발행 : 2004.01.20
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초록

A highly sensitive detecting method has been developed for determining part per billion of sulfur in $H_2S$/Ar plasma. The method is based on the excitation of Ar/$H_2S\;or\;Ar/H_2S/O_2$ mixture in hollow cathode glow discharge sustained by radiofrequency (RF) or 60 Hz AC power and the spectroscopic measurement of the intensity of emission lines from electronically excited $S_2^*\;or\;SO_2^*$ species, respectively. The RF or AC power needed for the excitation did not exceed 30 W at a gas pressure maintained at several mbar. The emission intensity from the $SO_2^*$ species showed excellent linear response to the sulfur concentration ranging from 5 ppbv, which correspond to S/N = 5, to 500 ppbv. But the intensity from the $S_2^*$ species showed a linear response to the $H_2S$ only at low flow rate under 20 sccm (mL/min) of the sample gas. Separate experiments using $SO_2$ gas as the source of sulfur demonstrated that the presence of $O_2$ in the argon plasma is essential for obtaining prominent $SO_2^*$ emission lines.

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피인용 문헌

  1. Radiofrequency driven and low cost fabricated microhollow cathode discharge for gaseous atomic emission spectrometry vol.26, pp.3, 2011, https://doi.org/10.1039/C0JA00216J