Development of Chromium (III) Potentiometric Sensor by Using 2-Benzamidopropanoic Acid

Document Type : Research Article


Department of Chemistry, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, I.R. IRAN


In this study, a selective and sensitive ion-selective liquid membrane electrode based on 2-benzamidopropanoic acid to the determination of chromium (III) was prepared. This electrode exhibits a Nernstian response for chromium (III) ions over a concentration range (0.3´10-1 to 1.0´10-5 mol/L) with a slope of 22.3 mV per decade. The limit of detection of the electrode was 8.0×10-6 mol/L. The sensor has a relatively fast response time (<10 s) and a useful working pH range of 3.5–8.0. Interference of some cations was also evaluated. The practical utility of the chromium (III) ion sensor has been demonstrated by using it as an indicator electrode in the potentiometric titration of chromium (III) with EDTA and for direct determination of chromium (III) in tea and cacao powder samples. Finally, the effect of ionic liquid of 1-Methyl-3-Pentylimidazolium bromide as an ionic additive was investigated.


Main Subjects

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