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中文摘要：
根据鸟嘌呤在短单壁碳纳米管修饰玻碳电极（S-SWCNT／GCE）上发生的电催化氧化特性，及其氧化电位对支持电解质溶液的pH值具有灵敏的响应，制备了以鸟嘌呤为指示剂的固体电位型pH传感器。在优化各种影响因素后，其电位在pH2．0～12．0范围内具有线性响应，回归方程为Epa（V）=-0．0497pH＋0．8931。该传感器制备简单，使用方便，响应时间〈20s。在pH响应范围内待测液中离子强度对测定没有影响。酸碱滴定终点具有明显的突跃。对Na^＋、K^＋和Ca^2＋的选择性系数小。已成功地应用于实际样品的测定。
英文摘要：
The electrocatalytic oxidation of guanine at the short single-walled carbon nanotubes modified glassy carbon electrode （S-SWCNT/GCE） was investigated. The guanine adsorbed on S-SWCNT/GCE was recommended as pH sensitive material to fabricate a solid pH sensor based on anodic peak potential of guanine responded sensitively to the pH of solution. After all of the effect factors were optimized, the sensor showed linear response to pH values in the range of 2.0 - 12.0 with a slope of 0. 0497 V/pH. The response time was less than 20 second. In the pH response range, the concentration of electrolyte had no effect on the detection. The selectivity coefficients towards sodium, potassium and calcium ions were estimated to 1. 03 × 10^-3, 1.19 × 10^-3 and 9.55 × 10^-4, respectively. The result is satisfactory for the determination of real samples as comparison to that from the pH selective electrode method.
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