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    Analyse van fluoride en fosfaat in complexe milieumatrices met capillaire zone elektroforese

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    Authors
    Staden JJ van
    Hoop MAGT van den
    Type
    Report
    Language
    nl
    
    Metadata
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    Title
    Analyse van fluoride en fosfaat in complexe milieumatrices met capillaire zone elektroforese
    Translated Title
    Analysis of fluoride and phosphate in complex environmental matrices using Capillary Zone Electrophoresis (CZE)
    Publiekssamenvatting
    Dit onderzoek bestudeert de toepasbaarheid van een eerder ontwikkelde methode voor de analyse van fluoride en fosfaat op meer complexe matrices zoals oppervlaktewater, loogextracten, grondwater en stemflowwater. De storende waterstofcarbonaat-piek bij de bepaling van fluoride in loogextracten kon door 'solid phase' extractie onderdrukt worden. Fluoride-addities aan loogextracten werden volledig teruggevonden. Fosfaataddities aan oppervlaktewater-, en aan grondwatermonsters werden gemiddeld voor respectievelijk 83% en 105% teruggevonden. Terugvindingen van fosfaataddities aan stemflowmonsters bleken door verschuiving van het fosfaatevenwicht niet van toepassing. Een relatieve en een absolute correctiemethode voor migratietijddrift door de monstermatrix werden met elkaar vergeleken. De absolute correctiemethode gaf de beste resultaten. Tevens werd de complexering van fluoride met aluminium bestudeerd. Fluorideconcentraties in aluminium/fluoride-oplossingen gevonden met de CZE-methode waren lager dan die berekend met het chemische speciatieprogramma GECHEQ.
    The results of a study into the analysis of fluoride and phosphate in solutions with complex environmental matrices using Capillary Zone Electrophoresis (CZE) have been described. Determination of fluoride in air absorption liquids was enabled by removing interferences by solid phase extraction. The average recovery of fluoride in these solutions was 109%. The average recoveries of additions of phosphate to riverwater-, and to groundwater were 83% en 105% respectively. Recoveries of additions of phosphate to stemflowwater could not be determined by changes of the phosphate equilibrium. Absolute correction with bromide as reference for migration time drift caused by the matrix improved the peak identification. A preliminary speciation study of the reaction of fluoride with aluminum has been made. In solutions with aluminum and fluoride, CZE gave lower fluoride concentrations compared to calculated concentrations on the basis of thermodynamic equilibrium.
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    URI
    http://hdl.handle.net/10029/262247
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