硫氰酸根—聚吡咯修饰电极对汞离子的配位响应

Electrochemical Behavior of Thiocyanate Acid-PPy Modified Electrode

研究掺杂硫氰酸根 (SCN )的聚吡咯 (PPy)修饰电极对二价汞离子的配位富集作用 ,探讨影响修饰电极响应的各种因素和修饰电极的电化学行为 ,并对电极响应的机理进行了初步探讨。结果表明 ,在 8 0× 10 6～ 5 0× 10 8mol/L浓度范围内 ,阳极峰电流与二价汞离子的浓度成正比 ,与未经修饰的裸玻碳电极相比 ,电流响应的灵敏度得到了很大提高 ,并应用于污水中汞含量的测定。

The compound assemble function of Hg 2+ by SCN --PPy film modified electrode is reported.Electrochemical behavior and factors that affect the response character of the CME is studied,and the response mechanism of the CME is discussed.The oxidation peak current at 0.46v is in direct proportion to concentration of Hg 2+ during 8.0×10 -6 and 5.0×10 -8 mol/L.The mehtod is applied to determine Hg 2+ in waste water.