The Spectral Properties And Electrolyzation Of Sudan

In the manufacturing procedure of food, food pigment is appropriately used as addition for the sake of the beautiful color. It can also maintain the original color, improve food sensory traits, enhance people's appetite. Sudan is often used by some unscrupulous manufacturers of food industry products for its low-cost,strong coloring,colorful stability. It especially appears in many detection of pepper sauce. The body will consume a lot of detoxification substances after Sudan enters human body through food. It can interference the normal metabolic function. It may be teratogenic and carcinogenic.Ultraviolet-visible absorption spectral properties of Sudan III in different solvents were studied.The UV-Vis spectral properties of SudanI, SudanIII and SudanIV in nonpolar solvent ligarine , polar solvent acetonit rile , and acetonit rile-water mixture were studied. Mixed samples of the three components series Sudan (SudanI, SudanIII, SudanIV) concentrations were determined applying artificial neural networks to BP algorithm. Take SudanI as investigated subject, the decolorization rate of the pulse electrolysis by Ti and Al electrode was studied. The influence factors and reaction mechanism of pulse electrolysis were discussed. We can conclude the follow conclusions.(1) When SudanⅢis in polar solvent,two absorption peaks appear in the mid-ultraviolet region,200～230 nm. And when it is in nonpolar solvent,the absorption changesfrom two peaks to one peak with the concentration of Sudan II increasing.When it is in composite solvent,the two absorption peaks disappear。but one absorption peak appears at 310 nn1. Molar absorptivities of Sudan II1 in the five solvents were determined,whose order of magnitude was 104 .(2) In acetonit rile-water mixture the red shif t of characteristic absorption peaks of sudanⅠa nd sudanⅢis respectively 13 and 8 nm , but the characteristic absorption peaks of sudanⅣa re red-shifted before blue shif ted. The increased adsorption st rength of SudanⅠ, SudanⅢa nd SudanⅣis 34.5 % , 11 % and 2.5 % respectively.(3) In MATLAB7.0, we constructed BP artificial neural network model, and optimized network conditions. With the network structure of 10-9-3 and certain network parameters the predicted results are satisfied. And the errors were between 0.03% and 9.20%. When the concentration of sample is less than 0.1×10^-4 mol·L^-1, the prediction error is more than 5%; When the concentration is greater than 0.1×10^-4 mol·L^-1, the relative error is below 5%. It shows that the method using BP artificial neural network model to predict the series of Sudan is feasible.(4) The change of electrolyte concentration, electrolysis voltage, duty cycle affects decolorization rate greatly. The fluctuation of decolorization rate is 26.2%. The change of pulse frequency, electrode spacing, electrolysis time affects decolorization rate verylittle. The greatest fluctuation of decolorization rate is 10.1%. The optimum parameters of pulse electroanalysis are confirmed as 1.5% for electrolyte concentration, 9V for electrolysis voltage, 50 Hz for pulse frequency, 30% for duty cycle, 1.0 cm for electrode spacing, 40 minutes for electrolysis time. For 0.2×10^-4mol·L^-1 of Sudan Solution, the dye decolorization rate reaches 86.6 percent.