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Title: DETERMINATION OF HYDROGEN SULFIDE AND TOTAL SULFUR IN NATURAL GAS
Author: Marshall T. Schreve
Source: 2019 American School of Gas Measurement Technology
Year Published: 2019
Abstract: Hydrogen Sulfide, ( H2S) found in natural gas and crude oil, was formed when animal and vegetable matter decayed in the absence of oxygen. Although we generally give credit to the dinosaurs for the oldest and largest sources, we are still generating this dangerous and unstable compound today in landfill, waste water treatment and as a byproduct in chemical and petrochemical processes. The need to detect, quantify and control Hydrogen Sulfide was met in the early 1970s when an industrious group in Houston Texas created the first commercial Hydrogen Sulfide Analyzer. The detection and analysis of Hydrogen Sulfide left the lab and became a valuable field instrument. Their methodology was simply a roll of paper tape, impregnated with a solution of Lead Acetate (C4H604Pb) and Acetic Acid (CH3COOH) . The paper tape was humidified by bubbling the sample gas through a solution of 5% Acetic Acid (95% distilled water), and then directing the gas to a detector block that allowed a very small aperture to expose the tape to any Hydrogen Sulfide that might be present in the gas stream. The Hydrogen Sulfide with the Lead Acetate to form a dark stain of Lead Sulfide (PbS). The challenge was to determine exactly how to calculate the darkness of the stain in relation to the concentration of Hydrogen Sulfide present in the gas sample.

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