Abstract: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.
