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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 1
BKCSDE 25(1)
January 20, 2004 

Molecular Emission Spectrometric Detection of Low Level Sulfur Using Hollow Cathode Glow Discharge
Il Gyo Koo, Woong Moo Lee*
Hollow cathode discharge, Emission spectroscopy, Sulfur detection, RF glow discharge, Plasma chemistry of sulfur compounds
A highly sensitive detecting method has been developed for determining part per billion of sulfur in H2S/Ar plasma. The method is based on the excitation of Ar/H2S or Ar/H2S/O2 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 S2* or SO2* 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 SO2* 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 S2* species showed a linear response to the H2S only at low flow rate under 20 sccm (mL/min) of the sample gas. Separate experiments using SO2 gas as the source of sulfur demonstrated that the presence of O2 in the argon plasma is essential for obtaining prominent SO2* emission lines.
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