聚吡咯碘酸根传感器的研究

The Study on the Sensor of Polypyrrole-iodate

以电化学方法，将吡咯单体（Ｐｙ）聚合到玻碳电极（ＧＣ）表面，制成了聚吡咯修饰电极（ＰＰｙ／ＧＣ），采用线性扫描伏安法（ＬＳＶ）研究表明，在 １． ０ ｍｏｌ／Ｌ ＨＣＩ（２℃）介质中， ＰＰｙ／ＧＣ电极对 ＩＯ３离子有较灵敏的响应，其还原峰电流Ｉｐ与ＩＯ３离子浓度在５．０×１０５～８．０×１０－３ｍｏｌ／Ｌ范围内有良好的线性关系，回归方程为：Ｉｐ（μＡ）＝－３．９０＋１．２０９ × １０５ ｃ（ｎ＝７，γ＝０．９９９８）．检测下限达２．０ × １０－５ｍｏｌ／Ｌ．该修饰电极可作为碘酸根离子的化学传感器．本文还对其还原反应机理进行了初步的探讨．

The modified electrode of polypyrrole (PPy/GC) was prepared with pyrrole monomer (Py) polymerizing on the surface of glassy carbon electrode (GC) by electrochemical method. This electrode has good response to the electroreduction of IO3 in 1. 0 mol/L HCI solution (2℃) by linear sweep voltammetry (LSV). Its reduction peak current (Ip) is proportional to the concentration of IO3 in the range of 5. 0 x 10 -5 to 8. 0 x 10 -3 mol/L, and its regression equation is IP(uA) = - 3. 90 + 1. 209 x 105 c (n= 7, r=0. 9998). The detection limit is 2. 0 x 10 -5 mol/L. This modified electrode could be used as a chemical sensor of iodate. The reaction mechanism was discussed.