Rapid assessment of the latent hazard posed by dissolved mercaptans within aqueous effluent

MM Villalba, VJ Litchfield, RB Smith, AM Franklin, NS Lawrence, J Davis

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    The presence of mercaptans (RSH) can usually be detected by their inherent noxious odour but there is a need to quantify the concentration within effluent and hence allow an assessment of the latent hazard to be made prior to disposal. The versatility of using naphthoquinone as a rapid derivatising agent through which to trap such species has been evaluated. The quinone moiety provides a label that can be quantified using colorimetric, electrochemical and chromatographic means and offers a significant advantage over conventional thiol labelling agents. The analytical characteristics of each approach have been investigated and the selectivity, sensitivity and applicability of the reaction system critically assessed for a range of model compounds. The naphthoquinone system has a detection limit in the low micromolar range with little interference from other components common to discharge water with 96% recovery of mercaptopropionate. The reaction to sulfide (HS-) has also been assessed and a disparity in response between the detection methods observed and a possible reaction pathway outlined.
    Original languageEnglish
    Pages (from-to)444-450
    JournalJournal of Hazardous Materials
    Volume154
    Issue number1-3
    DOIs
    Publication statusPublished - Jun 2008

    Keywords

    • sulfur
    • sulfide
    • mercaptan
    • naphthoquinone
    • chromatography
    • analysis

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