Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10561429 | Talanta | 2005 | 7 Pages |
Abstract
A highly selective poly(vinyl chloride) (PVC) membrane electrode based on butane -2,3-dione bis(salicylhydrazonato) zinc(II) [Zn (BDSH)] complex as carrier for thiocyanate-selective electrode is reported. The influence of membrane composition, pH and possible interfering anions were investigated on the response properties of the electrode. The sensor responds to thiocyanate in linear range from 1.0 Ã 10â6 to 1.0 Ã 10â1 M with a slope â56.5 ± 1.1 mV decadeâ1, over a wide pH range of 3.5-8.5. The limit of detection of the electrode was 7.0 Ã 10â7 M SCNâ. Selectivity coefficients determined with fixed interference method (FIM) indicate a good discriminating ability towards SCNâ ion in comparison to other anions. The proposed sensor has a fast response time of about 5-15 s and can be used for at least 3 months without any considerable divergence in potential. It was applied as indicator electrode in titration of thiocyanate with Ag+ and in potentiometric determination of thiocyanate in saliva and urine samples.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
M. Mazloum Ardakani, A. Sadeghi, M. Salavati-Niasari,