El-Jammal A, Bouklouze A A, Patriarche G J, Christian G D
Institut de Pharmacie, CP 205/6, Universite Libre de Bruxelles, Boulevard du Triomphe, 1050 Bruxelles, Belgium.
Talanta. 1991 Aug;38(8):929-35. doi: 10.1016/0039-9140(91)80274-4.
A new polymer matrix based membrane electrode with an ion-exchanger responding to calcium was constructed by dissolving the copolymer ethylene-vinyl-acetate together with the ion-exchanger in chloroform in the presence of a mixture of dioctylphthalate-nitrobenzene as plasticizer. The ion-exchanger used as the electroactive component was calcium didecyl phosphate in di-(n-octylphenyl) phosphonate (Orion). This electrode exhibited near-Nernstian response over the concentration range 10(-1)-4 x 10(-6)M calcium. The pH did not affect the electrode performance within the range 8-11. Response time varied from 15 to 120 sec and the lifetime exceeded six months. The membrane is subject to static charge buildup, but this is avoided by controlling the level of dryness of the membrane. Selectivity coefficients determined for both monovalent and divalent cations showed negligible interference by most of these ions. The electrode was applied successfully to the determination of calcium in commercial mineral waters.
通过在邻苯二甲酸二辛酯 - 硝基苯混合物作为增塑剂存在的情况下，将共聚物乙烯 - 醋酸乙烯酯与离子交换剂溶解于氯仿中，构建了一种基于新型聚合物基质的、带有对钙有响应的离子交换剂的膜电极。用作电活性成分的离子交换剂是二（正辛基苯基）膦酸酯（奥立龙）中的磷酸二癸酯钙。该电极在10⁻¹ - 4×10⁻⁶M钙的浓度范围内呈现近能斯特响应。在8 - 11的pH范围内，pH不影响电极性能。响应时间在15到120秒之间变化，使用寿命超过六个月。该膜会产生静电荷积累，但通过控制膜的干燥程度可避免这种情况。对单价和二价阳离子测定的选择性系数表明，大多数这些离子的干扰可忽略不计。该电极已成功应用于商业矿泉水中钙的测定。
