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The Potentiometric Analysis of Chloride Ion Using Modified Heterogeneous Chitosan Membranes

Author(s): Munaratul Aini Yahaya | Sulaiman Ab Ghani

Journal: Journal of Physical Science
ISSN 1675-3402

Volume: 19;
Issue: 1;
Start page: 43;
Date: 2008;
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Keywords: chloride | chitosan | heterogeneous membrane | chitosan–Cl– | chitosan–Fe3+

The potentiometric chloride ion selectivity of a polymer membrane based on PVC and chitosan as an active material was investigated. Two dipping solutions were chosen, KCl and FeCl3 solution. The selectivity coefficients, K, for some anions determined by chitosan–ClPotBA,– membrane were in the sequence of Br– ≈ I– > HCO3– > NO3– > OH– > SO42– > C2O42–, with values 0.03 to 0.28 (Log KPot = –1.3 to –0.55) and in the order of COBA,32– > HCO3– ≈ F– > ClO3– ≈ I– > NO3– ≈ IO3– > Br– > SO42– > OH–, with values 0.01 to 0.28 (Log K = –2.0 to –0.55) for chitosan–FePotBA,3+ membrane. The linear concentration ranges for both membranes were 1.0 x 10–4 – 1.0 x 10–1 M Cl–. The optimum pH were 6.5 ± 1.0 and 5.0 ± 1.0 for chitosan–Cl– and chitosan–Fe3+, respectively. There is no significant changes in performance within 60 days for chitosan–Cl– and 42 days for chitosan–Fe3+. The proposed membrane electrodes showed good agreement with a commercial electrode with correlation coefficient, r, 0.9560 and 0.9621 for chitosan–Cl– and chitosan–Fe3+, respectively.
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