Primary alkylamine selective electrodes were designed based on the host - guest interaction between calixarene ionophore and alkylammonium ions. The poly(vinyl chloride) (PVC) membrane electrode contains 1-3% m/m of an ester derivative of calixarene as the neutral carrier and dioctyl phthalate as the plasticizer. At pH 3.2, the electrode exhibits a Nernstian response in the range 1 × 10-1-3 × 10-4 mol l-1 hexylamine with a slope of 57.5 ± 0.8 mV per concentration decade. The electrode. The electrode has a fast response time of less than 1 min and a constant Nernstian response after 1 month of continuous measurement. In contrast to the traditional PVC ion-exchange membrane electrode, the present electrode system was found to be highly selective to primary amines. Hence, the primary amine content of a mixture of amines can be determined using the electrode with good accuracy and precision.
|Number of pages||5|
|Publication status||Published - 1993|
Scopus Subject Areas
- Analytical Chemistry
- Environmental Chemistry