研制了邻苯三酚红 ( PR)修饰碳糊电极 ,研究了采用该电极测定痕量锡的阳极溶出伏安法。在 0 .1 5 mol/L乙酸盐缓冲溶液 ( p H 4.5 )中 ,通过开路富集 ,Sn( )与修饰电极表面的邻苯三酚红生成络合物而富集于电极表面 ,然后介质交换至 4.0mol/L盐酸中 ,于 - 0 .80 V还原后再进行阳极化扫描 ,于 - 0 .69V左右获得一灵敏的 Sn的溶出峰 ,二次导数峰电流与 Sn( )浓度在 1 .68× 1 0 - 8～ 1 .68× 1 0 - 6mol/L范围内呈现良好的线性关系 ,检出限达 8× 1 0 - 9mol/L。对电极反应机理进行了讨论 ,方法已应用于罐头食品中锡的测定 Pyrogallol red (PR) -modified carbon paste electrode was developed. Anodic stripping voltammetry was developed for the determination of trace tin using this electrode. In 0.1 mol / L acetate buffer solution (p H 4.5), Sn () was enriched in the electrode surface by enrichment with Sn (Ⅲ) and pyrogallol red on the surface of the modified electrode The medium was exchanged into 4.0 mol / L hydrochloric acid and anaerobically scanned after reduction at -0.80 V. A sensitive peak of Sn was obtained at -0.69 V. The second derivative peak current was in the range of 1.68 × 10 ~ 8 ~ 1.68 × 10 6mol / L showed a good linear relationship, the detection limit of 8 × 10 ~ 9mol / L. The electrode reaction mechanism was discussed, the method has been applied to the determination of tin in canned food