Quantification of Hydrogen Sulfide and Methanethiol and the Study of Their Scavenging by Biocides of the Isothiazolone Family

Authors

  • Eric Frerot,

    Corresponding author
    1. Analytical Innovation Group, Corporate R&D Division, Firmenich S.A. 1, Route des Jeunes, 1211 Geneva 8 (Switzerland)
    • Analytical Innovation Group, Corporate R&D Division, Firmenich S.A. 1, Route des Jeunes, 1211 Geneva 8 (Switzerland)

    Search for more papers by this author
  • Alain Bagnoud,

    1. Analytical Innovation Group, Corporate R&D Division, Firmenich S.A. 1, Route des Jeunes, 1211 Geneva 8 (Switzerland)
    Search for more papers by this author
  • Esmeralda Cicchetti

    1. Analytical Innovation Group, Corporate R&D Division, Firmenich S.A. 1, Route des Jeunes, 1211 Geneva 8 (Switzerland)
    Search for more papers by this author

Abstract

A sensitive analytical method for the quantification of malodourous hydrogen sulfide (H2S) and methanethiol (CH3SH) was developed and validated. The method consisted of solid-phase microextraction with concomitant in-fibre derivatisation of the mercaptan using N-ethylmaleimide. The adducts were analysed by GC–MS using a triple quadrupole in the selected reaction monitoring mode. The limits of detection of solutions of H2S and CH3SH in water were 100 and 10 ng L−1, respectively, below their odour-perception thresholds. The analytical method was used to show the scavenging effect of 1,2-benzisothiazol-3(2H)-one (Proxel) and 2-methyl-4-isothiazolinone. The mechanism by which H2S and CH3SH are trapped with Proxel was studied by ultraperformance liquid chromatography (UPLC)-MS.

Ancillary