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Kit and method for testing liquids for hydrogen sulfide content

  • US 4,174,202 A
  • Filed: 11/28/1977
  • Issued: 11/13/1979
  • Est. Priority Date: 11/28/1977
  • Status: Expired due to Term
First Claim
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1. A method for qualitatively determining whether or not a liquid contains hydrogen sulfide in a concentration in excess of a preselected concentration, which comprises, in sequence:

  • (a) admixing a preselected quantity of the liquid to be tested with a quantity of a metal cation capable of reacting with sulfide ion to form a precipitate, which quantity of cation is stoichiometrically sufficient to react with the hydrogen sulfide which would be present in said preselected quantity of liquid if said hydrogen sulfide were initially present at said preselected concentration;

    (b) purging the liquid with an inert gas to remove unreacted hydrogen sulfide from the liquid;

    (c) contacting a reagent colorimetrically and selectively responsive to the presence of hydrogen sulfide with the gas purged from the liquid;

    (d) observing the color of the colorimetrically responsive agent, a color change in response to hydrogen sulfide being indicative that the liquid tested contained hydrogen sulfide at a concentration in excess of said preselected concentration.

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