Low Concentrations Of Hydrogen Sulfide Research Articles

The determination of very low concentrations of hydrogen sulphide in gas—I

AbstractThe determination of low concentrations of hydrogen sulphide in gas has been investigated. A modified calibration technique has been developed for the methylene blue method and its accuracy verified volumetrically and gravimetrically. Employing the methylene blue method as a primary standard, the relation between optical density and sulphur content of lead sulphide stains, obtained by passing gas through absorbent paper, has been replotted, using a specially designed photoelectric densitometer.

The Interaction of Sulfur and Sulfur Compounds with Olefinic Substances. VII. Low-Temperature Sulfuration of Trialkylethylenes with Hydrogen Sulfide-Sulfur Dioxide and with a Sulfur-Zinc Dithiocarbamate System

Abstract The sulfuration of trialkylethylenes with hydrogen sulfide-sulfur dioxide at 0° C (Peachey process) results in disubstitutive cross-linking of the olefins, yielding dialkenyl tetrasulfides. At higher temperatures, substitutive-additive cross-linking occurs, and alkyl alkenyl polysulfides are formed. Dialkenyl tetrasulfides are similarly formed by causing the olefin to react with sulfur at room temperature in the presence of zinc oxide and zinc dibutyldithiocarbamate, low concentrations of hydrogen sulfide acting as a catalyst for this reaction. At higher temperatures, the reaction is also exclusively disubstitutive, a feature connected with the function of zinc compounds in influencing the cross-linking reaction. The sulfuration of olefins with tetramethylthiuram disulfide at 140° C shows a similar influence of zinc compounds.

The interaction of sulphur and sulphur compounds with olefinic substances. VII Low‐temperature sulphuration of trialkylethylenes with hydrogen sulphide‐sulphur dioxide, and with a sulphur‐zinc dithiocarbamate system

AbstractThe sulphuration of trialkylethylenes with hydrogen sulphide‐sulphur dioxide at 0° (Peachey process) results in disubstitutive cross‐linking of the olefins, yielding dialkenyl tetrasulphides. At higher temperatures substitutive—additive cross‐linking occurs and alkyl alkenyl polysulphides are formed. Dialkenyl tetrasulphides are similarly formed by causing the olefin to react with sulphur at room temperature in the presence of zinc oxide and zinc dibutyldithiocarbamate, low concentrations of hydrogen sulphide acting as a catalyst for this reaction. At higher temperatures the reaction is also exclusively disubstitutive, a feature connected with the function of zinc compounds in influencing the cross‐linking reaction. The sulphuration of olefins with tetramethylthiuram disulphide at 140° shows a similar influence of zinc compounds.

A Low-Cost Sampler For Measurement of Low Concentration of Hydrogen Sulfide

A Low-Cost Sampler For Measurement of Low Concentration of Hydrogen Sulfide