UBRISA

View Item 
  •   Ubrisa Home
  • Faculty of Health Sciences
  • Environmental Health
  • Research articles (Dept of Environmental Health)
  • View Item
  •   Ubrisa Home
  • Faculty of Health Sciences
  • Environmental Health
  • Research articles (Dept of Environmental Health)
  • View Item
    • Login
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Headspace solid phase microextraction in the determination of pesticides in water samples from the Okavango Delta with gas chromatography-electron capture detection and time-of-flight mass spectrometry

    Thumbnail
    View/Open
    Mbongwe_MJ_2009.pdf (768.4Kb)
    Date
    2009
    Author
    Mmualefe, L.C.
    Torto, N.
    Huntsman-Mapila, P.
    Mbongwe, B.
    Publisher
    Elsevier Ltd, http://www.elsevier.com/locate/microc
    Link
    http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6W6H-4V74VPM-1-7&_cdi=6599&_user=778200&_pii=S0026265X08001550&_origin=browse&_zone=rslt_list_item&_coverDate=03%2F31%2F2009&_sk=999089997&wchp=dGLbVzW-zSkWW&md5=2418392d2a4911f239d417400855494e&ie=/sdarticle.pdf
    Type
    Published Article
    Metadata
    Show full item record
    Abstract
    Headspace solid phase microextraction (HS-SPME) was optimized for the analysis of pesticides with gas chromatography electron capture detection (GC-ECD) and high-resolution mass spectrometry. Factors influencing the extraction efficiency such as fiber type, extraction mode and temperature, effect of ionic strength, stirring and extraction time were evaluated. The lowest pesticide concentrations that could be detected in spiked aliquots after HS-SPME–GC-ECD ranged from 0.0005 to 0.0032 μg L−1. Consequently hexachlorobenzene, trans-chlordane, 4,4′-DDD and 4,4′-DDE were detected in water samples after HS-SPME at concentrations ranging from 2.4 to 61.4 μg L−1 that are much higher than the 0.1 μg L−1 maximum limit of individual organochlorine pesticides in drinking water set by the European Community Directive. The same samples were cleaned with ISOLUTE C18 SPE sorbent with an optimal acetone/n-hexane (1:1 v/v) mixture for the elution of analytes. No pesticides were detected after SPE clean-up and pre-concentration. Precision for both methods was satisfactory with relative standard deviations less than 20%. This work demonstrated the superiority of HS-SPME as a sample clean-up and pre-concentration technique for pesticides in water samples as well as the need to identify and control point sources of pesticides.
    URI
    http://hdl.handle.net/10311/851
    Collections
    • Research articles (Dept of Environmental Health) [6]

    DSpace software copyright © 2002-2015  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    @mire NV
     

     

    Browse

    All of UBRISA > Communities & Collections > By Issue Date > Authors > Titles > SubjectsThis Collection > By Issue Date > Authors > Titles > Subjects

    My Account

    > Login > Register

    Statistics

    > Most Popular Items > Statistics by Country > Most Popular Authors