Abstract
The development and testing of a cetyltrimethylammonium (CTA) cation-sensitive electrode are described. The active element is a plasticized polyvinyl chloride membrane containing a dissolved ion association complex of CTA with phosphotungstic acid (PTA). The effect of membrane composition was studied. The electrode exhibits a rapid and near-Nernstian response to CTA + from 3.2 × 10 −6 to 8.3 × 10 −4 M at 25 ± 0.1 °C. The response is unaffected by pH in the range of 2.5–8.5. Selectivity coefficients for numerous compounds are given. The electrode has been successfully applied to the direct determination of CTA in aqueous solution either by the standard addition method or by potentiometric titration vs PTA.
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