Research On Rapid Determination Of Sudan Red Ⅰ By Electrochemical Method

Sudan I is a artificial azo dye usually used in oil paint, printing, waxes, plastics, and dyeing since its bright and vivid colors could improve the luster of commercial products. Rapid Determination of Sudan RedⅠby Electrochemical Method in this paper.Rapid determination of Sudan RedⅠby electrochemical method have been studied in this paper. SudanⅠw as determined by polarography in NH3- NH4Cl and ethanol medium. In this experiment, optimal experimental conditions such as buffer solution, pH, and dosage of buffer solution were selected. Moreover, adsorptive property of compound on electrode was studied by some methods, such as linear sweep voltammetry, cyclic voltammetry. SudanⅠwas determined by differential pulse stripping voltammetry since stripping voltammetry can increase the sensitivity of determination. Optimal experimental conditions such as medium, pH, deposit potential, deposit time, scan rate were selected. In these conditions, there was a good linear relationship between the peak current and the compound concentration that was to be determined. Satisfactory results were obtained in determining synthetic samples. The electrode reduction reaction of SudanⅠwas an irreversible adsorption control process. There was a significant adsorption peak at -0. 43 V (vs. Ag-AgCl) in B-R solution (pH = 5.0). The standard sample of Sudan I was pre-concentrated on the electrode surface under stirring for 180s (scan rate was 50mV/s,pre-concentration potential was -0.47V). The peak current was proportional to the concentration of SudanⅠin the range of 8.0×10-7～1.6×10-5 mol/L . The detection limit was estimated to be about 2.76×10-7. The detect recovery was 101.37%.In addition, a new measurement of SudanⅠwas fund. That was, glassy carbon electrode, which was modified by polyhydroquinone film, electrocatalytic oxidizes SudanⅠ. In the study of preservation, The peak current was proportional to the concentration of SudanⅠin the range of 1.0×10-7～1.6×10-5 mol/L . The detection limit was estimated to be about 3.3×10-8 mol/L. The detect recovery was 102.56%.The modified electrode showed excellent stability and reproducibility. This method was applied to quick determination of SudanⅠin commercial food samples. The constructed detection method has a wide range of rapid determination.