A NEW SURFACTANT-BASED APPROACH FOR THE DETERMINATION OF MALACHITE GREEN

摘要

The effects of different types of surfactants on the determination of Malachite Green (MG) by using electrochemical method were studied, and a type of anionic surfactant of sodium dodecyl benzene sulphonate (SDBS) was screened out, proving to have played a significant sensitising effect in the determination of MG in pH 6.5 phosphate buffer solution. Cyclic voltammetry was applied in the research on the electrochemical behaviour of MG in carbon paste electrode, which optimised the supporting electrolyte, types and consistency of surfactant, time of concentration and experimental parameters. The peak current of MG and its concentration presented good linear relationship within the range of 1.0x10(-8)-2.0x10(-6) mol/l, and the detection limit was 8.0 x 10(-9) mol/l after 4 min of enrichment. A fast and sensitive electrochemical method for the determination of MG was established.