Premium
Cetyltrimethylammonium‐Selective PVC Electrode Based On Its Trinitrobenzene Sulfonate Ion‐Pair
Author(s) -
Issa Y. M.,
Badawy S. S.,
ElHawary W. F.,
Ashour M. S.
Publication year - 1999
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199910)11:14<1063::aid-elan1063>3.0.co;2-o
Subject(s) - potentiometric titration , bromide , polyvinyl chloride , chemistry , ion selective electrode , electrode , sulfonic acid , membrane , inorganic chemistry , selectivity , titration , chloride , electrode potential , sulfonate , electrochemistry , organic chemistry , sodium , biochemistry , catalysis
A PVC membrane electrode selective for cetyltrimethylammonium ion was prepared. The active element is a plasticized polyvinyl chloride membrane containing a dissolved ion pair complex of CTAB with trinitrobenzene sulfonic acid (TNBS). The electrode showed a near‐Nernstian response within the CTA + concentration range from 1.08×10 –6 to 8×10 –4 M at 25±1 °C, good selectivity, precision (RSD=1.04 %), and usable within the pH range 2.5–10.2. The isothermal temperature coefficient of the electrode amounted to –0.00007 V/°C. The electrode has been used for the direct determination of cetyltrimethylammonium bromide either by the standard addition method or by potentiometric titration against TNBS at pH 7.