Pesticide Residues In Samples Of Modern Processing Technology And Analysis Of Determination

With the increasing of health and safety consciousness nowadays, consumers pay more attention to pesticide residues in food than ever before. However, pesticide residue superscale has become increasingly widespread and serious. Enhancing the study on the detection of pesticide residues and improving detection technology of pesticide residue analysis at the same time has important theoretical and practical significance on the rational development and proper use of chemical pesticides, protecting the environment, human health protection, avoiding and reducing unnecessary losses of agriculture.The study mainly did research on the determination methods of diafenthiuron and pendimethalin pesticide residues in water, soil and some agricultural products, which includes the four parts below,1. A new method was developed for the determination of diafenthiuron in water with dispersive liquid–liquid microextraction (DLLME) and high performance liquid chromatography (HPLC). Under the most optimum conditions, the enrichment factor of the profenofos was about 358. The detection limit was 0.8μg/L. The relative standard deviations (RSD) was between 1.2% and 8.9% and the recovery rate ranged between 80.0% and 98.0%.2. A new method was developed for the determination of diafenthiuron and pendimethalin in water with DLLME and HPLC. Under the most optimum conditions, the enrichment factors of the diafenthiuron and pendimethalin were about 302,312 respectively. The detection limits were 0.4μg/L and 0.4μg/L respectively. The RSDs were between 1.6% and 10.6%, 1.4% and 9.5% respectively. The recovery rates ranged between 80.0% and 98.0%, 80.0% and 98.0% respectively.3. A new method for determination of diafenthiuron in soil used matrix solid-phase dispersion extraction technology (MSPD) coupled with HPLC was developed. Under the most optimum conditions, the detection limit was 0.12mg/L. The actual soil sample was determinated, which showed that the recovery rate ranged from 84% to 110%, the RSD was between 7.2% and 9.0%. The results are satisfactory.4. A new method was developed for determination of diafenthiuron in agricultural products with MSPD and HPLC. Under the optimum conditions, the detection limit was 0.09mg/L, the recovery rate range between 83.6% and 101.0%. The RSD was between 4.5% and 9.0%.