ISSN:
1040-0397
Keywords:
Quadridentate dihydrogen perchlorate
;
Macrocyclic membrane
;
Zn2+ ions
;
Baby foods
;
Soft drinks
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
A quadridentate dihydrogen perchlorate macrocyclic membrane is found to exhibit quite promising selectivity for Zn2+. It can be used to estimate zinc in the range 2.5 × 10-6 to 1.0 × 10-1 mol dm-3 (0.16 to 6.50 × 103 mg dm-3) with a near-Nernstian slope of ≍ 28 mV per decade of concentration. The working pH range of the sensor is 3.0 to 7.0. The polystyrene based membrane electrode is found to possess adequate stability and specific selectivity with a response time of 10 s. Most of the ions that interfere with Zn2+ electrode do not cause any significant disturbance with this assembly and the sensor can be used for more than three months in aqueous as well as in partially nonaqueous media. The utility of the membrane sensor has also been observed in solutions contaminated with detergent matter. The membrane sensor has also been used successfully to analyse some baby food products and soft drinks for the determination of Zn2+ ions.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140091307
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