Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10529326 | Analytica Chimica Acta | 2005 | 6 Pages |
Abstract
A new chelating resin, Aurin tricarboxylic acid modified silica, was synthesized. The resin behaves as a selective chelating ion exchanger for Cr(III) at a pH 3.8-5.5. A polyvinyl chloride-based membrane electrode of the modified silica has been fabricated and explored as sensor for Cr(III) ions. The membrane works well over the concentration range 7.0Â ÃÂ 10â6 to 1Â ÃÂ 10â1Â M of Cr(III) with a Nernstian slope of 19.0Â mV per decade of concentration. The response time of the sensor is 10Â s and it can be used for a period of 5 months. The performance of the sensor is best in the pH range 3.5-6.5 and it also works well in partially non-aqueous medium. The selectivity coefficient values depicts that the membrane exhibits good selectivity over a number of interfering ions. Moreover, the membrane sensor has been applied to analyse the concentration of chromium in certified steel sample and food materials with greater than 97% accuracy.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Rakesh Kumar Sharma, Ashu Goel,