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International Journal of Electrochemistry
Volume 2011, Article ID 958647, 7 pages
Research Article

Ion-Selective Electrode for Anionic Surfactants Using Hexadecyl Trimethyl Ammonium Bromide-Sodium Dodecylsulfate as an Active Ionophore

Key Laboratory of Surfactant and Interfaces, China Research Institute of Daily Chemical Industry, Shanxi Province, Taiyuan 030001, China

Received 9 May 2011; Revised 2 September 2011; Accepted 5 September 2011

Academic Editor: Hassan Ali Zamani

Copyright © 2011 Junwei Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The construction and characteristic performance of PVC membrane electrode responsive to sodium dodecylsulfate (SDS) are described in this paper. The electrode is based on hexadecyl trimethyl ammonium bromide-Sodium dodecylsulfate (CTA+DS) ion pair as ionophore in PVC membrane, which displays a Nernstian slope of −58 ± 0.9 mV/decade in a 5.0 × 10−6 to 2.5 × 10−3 mol L−1 concentration range and a limit of detection of 2.9 × 10−6 mol L−1. The electrode can be used for 3 months without showing significant changes in the value of slope or working range. Also the electrode has wide pH range of application and short response time. The electrode shows a selective response to SDS and a poor response to common inorganic anions. The selective sequence found was SDS > HCO3 > CH3COO > Cl > I > NO3 Br > F > CO32− > C6H5O73− > C2O42− > SO42− > C4H4O62− > SO32− > PO43−. The potentiometric selectivity coefficients determined are indicating that common anions would not interfere in the SDS determination. The electrode has been utilized as an end point indicator electrode for potentiometric titration involving hyamine as titrant.