Use of ESI-MS to determine reaction pathway for hydrogen sulphide scavenging with 1,3,5-tri-(2-hydroxyethyl)-hexahydro-s-triazine

Henrik Tækker Madsen, Erik Gydesen Søgaard

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10 Citations (Scopus)

Abstract

To study the reaction between hydrogen sulphide and 1,3,5-tri-(2-hydroxyethyl)- hexahydro-s-triazine, which is an often used hydrogen sulphide scavenger, electro spray ionisation mass spectrometry (ESI-MS) was used. The investigation was carried out in positive mode, and tandem mass spectrometry was used to investigate the nature of unknown peaks in the mass spectra. The reaction was found to proceed as expected from theory with the triazine reacting with hydrogen sulphide to form the corresponding thiadiazine. This species subsequently reacted with a second hydrogen sulphide molecule to form the dithiazine species, hereby confirming previously obtained results and showing the ability of the ESI-MS method for studying the scavenging reaction. The final theoretical product s-trithiane was not detected. Furthermore, fragmentation products of thiadiazine and dithiazine were detected in the solution, and possible pathways and structures were suggested to describe the observed fragments. In these, thiadiazine fragmented to 2- (methylidene amino)-ethanol and 2-(1,3-thiazetidin-3-yl)-ethanol and N-(2-hydroxyethyl)-N-(sulfanylmethyl)-ethaniminium, which underwent a further fragmentation to N-methyl-N-(2-oxoethyl)-methaniminium. Dithiazine fragmented to N-methyl-N-(2-oxoethyl)-methaniminium as well. The by-product from this reaction is methanedithiol, which was not detected due to its low polarity.
Translated title of the contributionBrug af ESI-MS til at bestemme reaktionsvej for hydrogen sulfid scavenging med 1,3,5-tri-(2-hydroxyethyl)-hexahydro-s-triazin
Original languageEnglish
JournalEuropean Journal of Mass Spectrometry
Volume18
Issue number4
Pages (from-to)377-383
Number of pages6
ISSN1469-0667
DOIs
Publication statusPublished - 2012

Keywords

  • Hydrogen Sulfide
  • Triazine
  • Scavenging
  • Electrospray ionization
  • mass spectrometry

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