功能性电极快速伏安检测孔雀石绿

用阴离子表面活性剂十二烷基硫酸钠(SDS)修饰导电炭黑糊电极,制备了对孔雀石绿(MG)具有高灵敏度的功能传感器。实验对MG在该功能电极上的电化学行为进行了研究,并对影响测定的各种条件(制备糊电极所用导电材料种类;功能试剂修饰量;支持电解质的离子强度、pH值、种类;富集电位与时间等)进行了优化。在优化条件下,MG的氧化峰电流(ipa)与其浓度在5～200μg/L范围内呈线性关系,检测限为1.5μg/L(S/N=3)。该方法具有较高的灵敏度、良好的重现性和稳定性。应用于测定经过简单过滤预处理后的淡水渔业水样,平均回收率为90%。

Rapid detection of malachite green by voltammetry based on functionalized electrode

A special electrochemical sensor system for detecting malachite green(MG) based on sodium dodecyl sulfate functionalized conductive carbon black paste electrode was established.The electrochemical behaviors of MG at the functionalized electrode were studied.And the effecting factors,including conductive carbon materials,content of the modifying agent,ionic strength and species of the supporting buffer solution,pH,accumulation potential,and accumulation time were optimized.Under the optimized conditions,in the range of 5 ~ 200 μg/L,the dependence of the anodic peak current on the concentration of MG was linear with a detection limit of 1.5 μg/L(signal/noise = 3).This method exhibited high sensitivity,good stability and reproducibility.After a simple pretreatment by filtration,MG in real fresh water samples from fishery environmental was detected.And the results were satisfactory with a 90% average recovery rate.