Jump to main content
Jump to site search

Issue 8, 2016
Previous Article Next Article

In situ speciation of dissolved inorganic antimony in surface waters and sediment porewaters: development of a thiol-based diffusive gradients in thin films technique for SbIII

Author affiliations

Abstract

Antimony is a priority environmental contaminant typically present as either the trivalent (SbIII) or the pentavalent (SbV) oxidation state in aquatic systems. Both the toxicity and mobility of antimony are affected by its speciation, and thus the accurate measurement of antimony speciation is essential for investigating the behaviour of this contaminant in aquatic systems. Here we present a diffusive gradients in thin films (DGT) technique, which utilises a binding layer containing a thiol-based adsorbent (3-mercaptopropyl functionalised silica gel), for the selective measurement of SbIII in surface waters and sediment porewaters. We also evaluated the Metsorb DGT technique, which has been previously reported to accurately measure SbV, for its ability to accumulate SbIII and thus allow the measurement of total inorganic antimony. Both the mercapto-silica and Metsorb DGT techniques showed a high affinity for SbIII, with uptake efficiencies >97%. Elution efficiencies of 86.9 ± 2.6% and 88.1 ± 1.2% were obtained for mercapto-silica and Metsorb, respectively, with 1 mol L−1 H2O2 in 1 mol L−1 NaOH. The accumulation of SbIII by these DGT techniques was linear with time (R2 > 0.99) and unaffected by pH (4.07–8.05), ionic strength (0.001–1.0 mol L−1 NaCl), bicarbonate (1–15 mmol L−1), and an artificial seawater matrix (pH 8.34; salinity 34.8). Finally, the mercapto-silica DGT technique was applied to measure porewater concentrations of SbIII and AsIII in a contaminated freshwater sediment at high resolution.

Graphical abstract: In situ speciation of dissolved inorganic antimony in surface waters and sediment porewaters: development of a thiol-based diffusive gradients in thin films technique for SbIII

Back to tab navigation

Supplementary files

Publication details

The article was received on 22 Mar 2016, accepted on 10 May 2016 and first published on 10 May 2016


Article type: Paper
DOI: 10.1039/C6EM00189K
Citation: Environ. Sci.: Processes Impacts, 2016,18, 992-998
  •   Request permissions

    In situ speciation of dissolved inorganic antimony in surface waters and sediment porewaters: development of a thiol-based diffusive gradients in thin films technique for SbIII

    W. W. Bennett, M. Arsic, D. T. Welsh and P. R. Teasdale, Environ. Sci.: Processes Impacts, 2016, 18, 992
    DOI: 10.1039/C6EM00189K

Search articles by author

Spotlight

Advertisements