Department of Chemistry, Faculty of Science, Ankara University, Ankara, Turkey.
Talanta. 2004 Jan 9;62(1):123-9. doi: 10.1016/S0039-9140(03)00414-4.
A hydrogen ion-selective poly(vinyl chloride) (PVC) membrane electrode was developed using p-tert-butylcalix[4]arene-oxacrown-4 as ionophore. Apart from the ionophore, plasticisers and lipophilic anions were blended, in various proportions, with PVC in tetrahydrofurane and mixtures so prepared were poured onto glass surfaces to form the membrane. 2-Nitrophenylpentylether has proved to be the best alternative as plasticiser and the lipophilic anions tried have turned out to have an adverse effect on the pH response. The electrode of the optimum characteristics had a composition of 2% p-tert-butylcalix[4]arene-oxacrown-4, 68.3% o-NPPE and 29.7% PVC. The electrode showed an apparent Nernstian response in the pH range 2-11 with a slope of 54.2+/-0.4mVpH(-1) at 20+/-1 degrees C. It has a rapid potential-response to changes of pH, high ion selectivity towards lithium, sodium and potassium, and other characteristics comparable to those reported for the conventional pH glass membrane electrode. It appears to be a suitable potentiometric indicator electrode specifically for hydrofluoric acid solutions.
采用对叔丁基杯[4]芳烃-氧杂冠醚-4 作为离子载体，研制了一种对氢离子选择性的聚氯乙烯（PVC）膜电极。除了离子载体外，增塑剂和亲脂性阴离子以不同的比例与 PVC 混合在四氢呋喃中，然后将混合物浇铸在玻璃表面上形成膜。2-硝基苯戊基醚已被证明是最好的增塑剂替代品，而尝试的亲脂性阴离子对 pH 响应有不利影响。具有最佳特性的电极的组成是 2%的对叔丁基杯[4]芳烃-氧杂冠醚-4、68.3%的 o-NPPE 和 29.7%的 PVC。该电极在 20+/-1 摄氏度时，在 pH 值为 2-11 的范围内呈现出明显的能斯特响应，斜率为 54.2+/-0.4mVpH(-1)。它对 pH 值变化的电位响应迅速，对锂、钠和钾具有高离子选择性，并且具有与传统 pH 玻璃膜电极相当的其他特性。它似乎是一种适合用于氢氟酸溶液的电位指示电极。
