To prevent the adsorption impediment of H2S in the trace sulfur analyzer approved by ASTM D 4045, a specially prepared pure ceramic tube has been advanced to be the only usable reactor for hydrogenolysis procedure. However, a conventional ceramic tube becomes usable by inhibiting the H2S adsorption on the basic impurities by a substitute adsorption of CO2 that can be introduced continuously with H2 in the ceramic reactor. Applying the OxyHydro procedure to reduce the carbon deposit in the analysis of kerosene, a large overestimation error occurred in the determination of a single ppb of sulfur even using the specially prepared pure ceramic tube. The overestimation error was completely eliminated by the continuous introduction of CO2 with H2, even using conventional ceramic reactors. By following procedures to suppress noise from the system, the original limit of detection of 25 ppb sulfur for the analyzer was improved to 0.3 ppb.
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