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1343020 
Journal Article 
VOLTAMMETRIC DETERMINATION OF AS(III) IN AN AQUEOUS ZWITTERIONIC COMPLEXING MEDIUM 
Azab, HA; Elshatoury, SA; Elmaali, NA 
1994 
1 
Monatshefte für Chemie / Chemical Monthly
ISSN: 0026-9247
EISSN: 1434-4475 
125 
5 
497-507 
WOS:A1994NM85600004 
The polarographic behaviour and determination of As(III) in
aqueous complexing electrolytes (bicine buffer solutions) of pH values varying from 1.13-11.96
have been investigated at 25-degrees-C (direct current and differential pulse polarographic
techniques). Using DC polarographic measurements, it was shown that reduction of As(III) takes
place along one or three waves depending upon the pH value of the solution. Microcoulometric
experiments have been performed at the limiting region of the different waves obtained at
different pH values. Cyclic voltammograms were recorded using a HDME to investigate the nature of
reduction. Schemes for the mechanism of reduction occurring at the DME have been deduced. Kinetic
parameters and wave characteristics for the reduction of As(III) have been calculated. A method
for DPP determination of As(III) in bicine buffer solution of pH 1.41 is reported. The detection
limit of the method is 6.60 x 10(-8) M As(III). 
VOLTAMMETRY; POLAROGRAPHY; COULOMETRY; ARSENIC; BICINE