Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9743738 | Analytica Chimica Acta | 2005 | 6 Pages |
Abstract
PVC-based membranes of 5,11,17,23,29,35-hexa-tert-butyl-37,38,39,40,41,42-hexakis(carbamoylmethoxy)calix[6]arene (I) as electroactive material with dioctyl phthalate (DOP), 1-chloronaphthalene (CN), dibutyl phthalate (DBP), o-nitrophenyl octyl ether (NPOE) and tris(2-ethylhexyl) phosphate (TEP) as plasticising solvent mediators have been prepared and used for phosphate determination. The membrane having composition PVC:I (150:5.7) exhibited the best result with linear potential response in the concentration range of 1.77Â ÃÂ 10â5 to 1.0Â ÃÂ 10â1Â M of HPO42â with a slope of 33.0Â mV/decade. The membrane worked satisfactorily in non-aqueous medium up to 5% (v/v) non-aqueous content. The selectivity coefficient values for mono- and divalent anions indicate good selectivity for phosphate over a large number of anions. The proposed sensor has been successfully used in the real sample analysis.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Vinod K. Gupta, Rainer Ludwig, Shiva Agarwal,