Bestimmung von Arsen im sub-ppb-Bereich durch Differential-Pulse-Cathodic-Stripping-Voltammetrie

6533b874fe1ef96bd12d5fdb

RESEARCH PRODUCT

Bestimmung von Arsen im sub-ppb-Bereich durch Differential-Pulse-Cathodic-Stripping-Voltammetrie

Rolf Neeb G. Henze A. P. Joshi A. P. Joshi

subject

Chemistry Clinical Biochemistry General Materials Science General Medicine Analytical Chemistry Nuclear chemistry

description

Es wird ein Verfahren zur Bestimmung von As(III)-Spuren durch Differential-Pulse-Cathodic-Stripping-Voltammetrie (DPCSV) beschrieben. Als Arbeitselektrode dient ein hangender Quecksilbertropfen. Die Anreicherung erfolgt bei −0,55 V (Bezugselektrode: Ag/AgCl/KCl ges.) aus 1 N HCl in Gegenwart von CuCl2. Das Elektrolyseprodukt ist vermutlich eine intermetallische Verbindung der Zusammensetzung Cu3As, die auf der Oberflache des Quecksilbertropfens abgeschieden wird. Die Auflosung durch »cathodic-stripping« auf Grundlage der Weiterreduktion des Arsens zu negativ 3 wertigem Arsen fuhrt zu einem bei −0,77 V bis −0,79 V liegenden Peak, dessen Hohe von 0,2 bis 20 ppb As linear zunimmt. Auf Storeinflusse wird hingewiesen.

year	journal	country	edition	language
1980-01-01	Fresenius' Zeitschrift für analytische Chemie

https://doi.org/10.1007/bf00469972

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