Study On Fluorescence Spectroscopy Detection And Degradation Of Typical Priority Pollutants

Nowadays,people have paid more and more attention to environmental pollution and food safety.It is of great value to find a rapid and effective detection method for typical priority pollutants such as food additives and pesticide residues.On the other hand,it has enormous social significance to achieve the effective degradation of typical priority pollutants such as pesticides.In this paper,the effective detection of typical priority pollutant residues was realized based on fluorescence spectroscopy.The correlation between the spectral characteristic peak intensity and concentration of food additives(carminum,aspartame)as well as pesticides in fruit juice(zhongshengmycin pesticides,pyridaben,boscalid)is systematically studied.By establishing the corresponding spectral detection model function,the correlation coefficient was basically over 0.99.At the same time,the model function is evaluated and analyzed through the aspects of recovery rate and relative standard deviation.The hardware experimental platform for pesticide residue degradation based on UV light and ozone technology was designed and built.Several pesticide and its solutions mixed with juice degradation experiments are carried out.The change of fluorescence intensity of pesticide characteristic peak was used to characterize the effect of pesticide residue degradation.The model function between degradation time and fluorescence intensity was constructed,and the correlation coefficient was more than 0.99.Meanwhile,the corresponding degradation rates of different degradation time was calculated by combining with the fluorescence spectrum pesticide residue detection function.Experimental results show that UV can effectively degrade the pesticide,when the degradation of 59 min,the degradation rate is 99.81%;After 60 min,UV light degradation of zhongshengmycin in apple juice rate was 61.53%,and the corresponding in grape juice degradation rate was 41.93%.Degradation experiments of fenpropathrin in apple juice are carried out with ozone,and the degradation rate was 60.0% after 60 s.In this paper,we also used 3% hydrogen peroxide for the degradation experiment of thiamethoxam.The degradation rate could reach 98.7% when 3% hydrogen peroxide is with the capacity of 42.8 m L.The results of this paper provide important reference for the rapid detection and degradation of typical priority pollutants,the maintenance of environment as well as food safety.