聚亚甲基蓝/碳纳米管修饰电极阳极溶出伏安法测定痕量锡

Anodic stripping voltammetric determination of Sn(II) at poly methylene blue/multiwalled carbon nanotube modified electrode

研究了聚亚甲基蓝／碳纳米管修饰电极通过阳极溶出伏安法测定痕量Sn^2＋的电分析方法。Sn^2＋通过与电极表面的亚甲基蓝吩噻嗪环上S和N原子发生螫合作用而富集在电极表面，同时在-1．20V（vs．SCE）还原成Sn^0,当电极电势从-1．20V向-0．30V扫描时，被还原的Sn^0从电极表面溶出。碳纳米管与亚甲基蓝的协同作用，使得Sn^2＋在该修饰电极上有良好的响应。Sn^2＋的溶出峰电流与其浓度在0．2×10^-3～0．1mmol／L浓度范围内呈良好的线性关系，检测限为0．1×10^-3mmol／L。

An electroanalysis method for determination of Sn^2＋ ions is described using poly methylene blue （PMB）/muhiwalled carbon nanotube （MWNT） modified glassy carbon electrode by anodic stripping voltammetry. Sn^2＋ Have a chelation with S and N atoms in the phenothiazine ring of MB on the electrode surface,resulting Sn^2＋ can be preconcentrated on the electrode surface, and be reduced to Sn^0 at - 1.20 V （ vs. SCE） at the same time. Sn^0 Can be dissolved from the electrode surface when scanning from - 1.20 V to - 0.30 V. The striping peak currents of Sn2 ~ increased obviously because of cooperation of MWNT and PMB, and the current-to-concentration relationship for Sn^2＋ is linear from 0. 2 x 10^-3 mmol/L to 0.1 mmol/L with a detection limit of 0.1 x 10^-3 mmol/L.