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.
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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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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></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><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></front></TEI><affiliations><list><country><li>Allemagne</li></country></list><tree><country name="Allemagne"><noRegion><name sortKey="Sander, Sylvia" sort="Sander, Sylvia" uniqKey="Sander S" first="Sylvia" last="Sander">Sylvia Sander</name></noRegion><name sortKey="Henze, Gunter" sort="Henze, Gunter" uniqKey="Henze G" first="Günter" last="Henze">Günter Henze</name><name sortKey="Wagner, Wolfram" sort="Wagner, Wolfram" uniqKey="Wagner W" first="Wolfram" last="Wagner">Wolfram Wagner</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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