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Comparison of Volatile Sulfur Compound Concentrations Measured with a Sulfide Detector vs. Gas Chromatography

¹ The Minneapolis Veterans Affairs Medical Center (151), 1 Veterans Drive, Minneapolis, MN 55417;
² Department of Medicine, University of Minnesota; and
³ Dental School, Preventive Sciences, University of Minnesota;

View larger version (23K): [in a new window]   Figure 1. Typical sulfide detector output curves recorded during the input of constant concentrations (about 300 ppb) of H2S, CH3SH, or CH3SCH3. Superimposed on these curves is a typical response of the sulfide detector during the measurement of oral VSCs in a volunteer. Note the early peak VSC concentration is followed by a lower, relatively constant ("plateau") concentration.

View larger version (14K): [in a new window]   Figure 2. Plots of the concentrations of H2S, CH3SH, or CH3SCH3 measured with the sulfide detector vs. the concentrations measured with GC. Data are shown for sulfide detector measurements recorded at 6 sec and 1.5 min after initiation of a constant input of the individual VSCs at concentrations of about 50, 300, and 800 ppb (measured by GC). The line of identity for paired measurements is indicated by the dotted line.

View larger version (14K): [in a new window]   Figure 3. (A) Plot of peak oral VSC concentration measured by the sulfide detector vs. the GC-measured VSC concentration in oral gas obtained immediately before initiation of aspiration into the sulfide detector. Data represent triplicate measurements made in 18 individuals. The three determinations made for each individual are denoted by a common symbol. (B) Plot of plateau oral VSC concentration measured by the sulfide detector vs. the GC measurement of total VSC concentration in gas obtained during the plateau phase. Data represent triplicate measurements made in 18 individuals, and the three determinations made for each individual are denoted by a common symbol.