THIOCYANATE ION-SELECTIVE PVC MEMBRANE ELECTRODE

• Main Authors: Mihail Revenco, Mariana Martin, Waell Abu Dayyih
• Format: Article
• Language: English
• Published: Academy of Sciences of Moldova, Institute of Chemistry 2010-06-01
• Series: Chemistry Journal of Moldova: General, Industrial and Ecological Chemistry
• Subjects: thiocyanate; potentiometric sensor; titration
• Online Access: http://www.cjm.asm.md/sites/default/files/article_files/73-77%20Revenco.pdf

A potentiometric selective sensor based on trinuclear chromium(III) complex as a novel ionophore for the thiocyanateselective electrode is reported. The sensor displays a near Nernstian slope of 57 ± 2 mV per decade, over a wide pH range 3 - 11. The working concentration range of the electrode is 1.10-5 – 1.10-1 mol/l with a detection limit of 5.10-6 mol/l. The sensor has a response time of 20 s and can be used for at least 6 months without any considerable fluctuation of the potential. The selectivity coefficients determined at using the fixed interference method indicate a good discriminating ability towards other anions. The prepared sensor was applied as an indicator electrode in the titration of thiocyanate with Ag+.