Title of article :
Highly selective thiocyanate membrane electrode based on butane-2,3-dione bis(salicylhydrazonato)zinc(II) complex
Ardakani، نويسنده , , M. Mazloum and Sadeghi، نويسنده , , A. and Salavati-Niasari، نويسنده , , M.، نويسنده ,
Issue Information :
ماهنامه با شماره پیاپی سال 2005
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 × 10−6 to 1.0 × 10−1 M with a slope −56.5 ± 1.1 mV decade−1, over a wide pH range of 3.5–8.5. The limit of detection of the electrode was 7.0 × 10−7 M SCN−. Selectivity coefficients determined with 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 5–15 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.
Thiocyanate-selective electrode , Potentiometry , PVC Membrane