Author/Authors :
Taheri، Khalil نويسنده Department of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran Taheri, Khalil , Afsari، Tahereh نويسنده Department of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran Afsari, Tahereh
Abstract :
A graphite coated ion selective electrode (GCISE) based on Dibenzo-18-Crown-6
(DB18C6) as a neutral carrier in a Poly Vinyl Chloride (PVC) matrix was fabricated for the
determination of K+ ions. The GCISE exhibited a Nernstion slope of 55.3 mV per decade for
K+ ion over a wide concentration range of 1.0×10-5 to 1.0×10-1M. The lower detection limit is
5.4×10-6M of KCl. This GCISE had a short response time of 10s, and could be used in a pH
range of 2.4 to 9.5. Matched potential method (MPM) was used for determination of
selectivity coefficient. High selectivity was obtained over 10 various metal ions. The GCISE
was reproducible and stable for a period of two weeks. It was successfully applied in
determination of potassium in Oral Rehydration Salts (O.R.S) and mineral water
