Abstract
An ion selective electrode for thiocyanate based on a complex as ionophore is described. The influence of membrane composition, pH and interference anions were investigated. The sensor responds to thiocyanate in the linear range from 1 × 10−6–1 × 10−1 M with a slope −58.9 ± 0.5 mV decade−1. The limit of detection is 5 × 10−7 M SCN−. Selectivity coefficients determined with the fixed interference method (FIM) indicate a good discriminating ability towards SCN− ion in comparison to other anions. The proposed sensor has a fast response time of about 5–20 s and can be used for at least 2 months without any considerable divergence in potential. It was applied as indicator electrode in the titration of thiocyanate with Ag+ and in the potentiometric determination of thiocyanate in saliva and urine samples.
Published Version
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