Determination of Chromium(III) and Magnesium(II) Ions in Pharmacological and Real Water Samples using Potentiometric Sensors based on Chitosan Schiff base Derivative as Green and Sensitive Ionophore

Authors

Department of Chemistry, Faculty of Sciences, Mashhad Branch, Islamic Azad University P.O. Box 91735-413, Mashhad, Islamic Republic of Iran

Abstract

In the study, novel and sensitive carbon paste electrodes (CPEs) developed for the
potentiometric measurement of Cr(III) and Mg(II) ions in pharmacological and water samples.
CPEs as indicator electrodes were prepared from a mixture of four components, including
graphite powder, paraffin oil, multi-walled carbon nanotubes (MWCNTs), and a green
ionophore (Chitosan Schiff base derivative). Optimization of CPE composites indicated that
the critical factor in the preparation of the CPEs was chitosan Schiff base derivative which
selectivity proposed sensors highly depended on this factor. Effects of various parameters such
as pH, lifetime, response time, and selectivity of the potentiometric sensors to determine Cr(III)
and Mg(II) ions were also evaluated. The results indicated that the proposed sensors can be
applied in a relatively wide range of pH, long lifetimes, short response times, and excellent
selectivity for the analyte determination. The prepared sensors show Nernstian slopes of 19.53
and 29.83 mVdecade−1, and LODs of 5.6×10– 8 and 4.4×10−9 with RSDs lower than 2.3% for
Cr(III) and Mg(II) ion determination, respectively. The calibration curves were linear in the
concentration ranges of 1.0×10-7-1.0×10-2 and 1.0×10-8-1.0×10-3 M, and R-square of 0.989 and
0.987 for the measurement of Cr(III) and Mg(II) ions, respectively. Besides, the sensors were
successfully utilized for the Cr(III) and Mg(II) ion measurement in real samples such as tablet
and tap water samples with suitable recovery higher than 97.6%.

Keywords

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Analytical and Bioanalytical Electrochemistry
Volume 12, Issue 2
February 2020
Pages 180-192

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History

  • Receive Date: 14 January 2020
  • Revise Date: 18 February 2020
  • Accept Date: 19 February 2020

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