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    Partitioning of the pesticide trifluralin between dissolved organic matter and water using automated SPME-GC/MS

    Access Status
    Fulltext not available
    Authors
    Caupos, E.
    Touffet, A.
    Mazellier, P.
    Croue, Jean-Philippe
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Caupos, E. and Touffet, A. and Mazellier, P. and Croue, J. 2015. Partitioning of the pesticide trifluralin between dissolved organic matter and water using automated SPME-GC/MS. Environmental Science and Pollution Research. 22 (6): pp. 4201-4212.
    Source Title
    Environmental Science and Pollution Research
    DOI
    10.1007/s11356-014-3614-0
    ISSN
    0944-1344
    School
    Curtin Water Quality Research Centre
    URI
    http://hdl.handle.net/20.500.11937/21923
    Collection
    • Curtin Research Publications
    Abstract

    Solid-phase microextraction (SPME) was used to determine the equilibrium association constant for a pesticide, trifluralin (TFR), with dissolved organic matter (DOM). After optimization of the SPME method for the analysis of TFR, partition coefficients (KDOM) with three different sources of DOM were determined in buffered solutions at pH 7. Commercial humic acids and DOM fractions isolated from two surface waters were used. The values of log KDOM varied from 4.3 to 5.8, depending on the nature of the organic material. A good correlation was established between log KDOM and DOM properties (as measured with the H/O atomic ratio and UV absorbance), in agreement with literature data. This is consistent with the effect of polarity and aromaticity for governing DOM-pollutant associations, regardless of the origin of DOM. This association phenomenon is relevant to better understand the behavior of pesticides in the environment since it controls part of pesticide leaching and fate in aquatic systems.

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