Possibilities for the automated determination of trace concentrations of uranium in water samples by adsorptive stripping voltammetry
Identifieur interne : 002465 ( Main/Exploration ); précédent : 002464; suivant : 002466Possibilities for the automated determination of trace concentrations of uranium in water samples by adsorptive stripping voltammetry
Auteurs : Sylvia Sander [Allemagne] ; Wolfram Wagner [Allemagne] ; Günter Henze [Allemagne]Source :
- Analytica Chimica Acta [ 0003-2670 ] ; 1997.
Descripteurs français
- Pascal (Inist)
- Wicri :
English descriptors
- KwdEn :
Abstract
The paper describes the development of two different techniques for the automated determination of uranium by adsorptive stripping voltammetry (AdSV). As a complex forming reagent 2,5-dichloro-3,6-dihydroxy-1,4-benzoquinone (chloranilic acid) is used. The automation was performed in one case using an auto-batch system and in the second case by means of a flow-through cell. Sensitivities, reproducibilities and the fields of application are evaluated. The auto-batch technique, with the automatic standard addition capability as well as its logical decision-making capacity for selecting the correct type of working electrode makes it highly suitable for the determination of varying uranium concentrations above 1 μg/l. The dilution of the sample, required by the methodology, makes determinations of uranium concentrations less than 1 mg/l unattainable. The flow-through technique is more suited to determine uranium at the ultra trace concentration level (above 70 ng/l). Provided the matrix is reasonably constant, a pre-determined calibration curve can be used and, due to the higher slope of the calibration plot in the flow-through technique, the linear concentration range extends to a lower concentration compared to stationary conditions. Another advantage of the flow-through technique is the possibility of kinetic and mechanistic investigations of AdSV procedures.
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DOI: 10.1016/S0003-2670(96)00591-0
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Le document en format XML
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adsorption</term>
<term>Automatic operation</term>
<term>Benzoquinone derivatives</term>
<term>Calibration</term>
<term>Chemical analysis</term>
<term>Dilution</term>
<term>Reoxidation</term>
<term>Standard addition method</term>
<term>Stripping voltammetry</term>
<term>Trace analysis</term>
<term>Uranium</term>
<term>Uranium complex</term>
<term>Uranium traces</term>
<term>Voltammetry</term>
<term>Water</term>
<term>Waters</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Adsorption</term>
<term>Analyse chimique</term>
<term>Analyse trace</term>
<term>Benzoquinone dérivé</term>
<term>Dilution</term>
<term>Eau</term>
<term>En automatique</term>
<term>Etalonnage</term>
<term>Méthode ajout</term>
<term>Réoxydation</term>
<term>Ultratrace</term>
<term>Uranium</term>
<term>Uranium complexe</term>
<term>Voltammétrie</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Eau</term>
<term>Uranium</term>
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<front><div type="abstract" xml:lang="en">The paper describes the development of two different techniques for the automated determination of uranium by adsorptive stripping voltammetry (AdSV). As a complex forming reagent 2,5-dichloro-3,6-dihydroxy-1,4-benzoquinone (chloranilic acid) is used. The automation was performed in one case using an auto-batch system and in the second case by means of a flow-through cell. Sensitivities, reproducibilities and the fields of application are evaluated. The auto-batch technique, with the automatic standard addition capability as well as its logical decision-making capacity for selecting the correct type of working electrode makes it highly suitable for the determination of varying uranium concentrations above 1 μg/l. The dilution of the sample, required by the methodology, makes determinations of uranium concentrations less than 1 mg/l unattainable. The flow-through technique is more suited to determine uranium at the ultra trace concentration level (above 70 ng/l). Provided the matrix is reasonably constant, a pre-determined calibration curve can be used and, due to the higher slope of the calibration plot in the flow-through technique, the linear concentration range extends to a lower concentration compared to stationary conditions. Another advantage of the flow-through technique is the possibility of kinetic and mechanistic investigations of AdSV procedures.</div>
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