Abstract:

To study the residue dynamic, make an assessment on the security of Thiamethoxam in seed coating potato and establish the detection method of potato plant and tuber. The samples were extracted with methanol, concentrated and cleaned up, determined using HPLC equipped with UVD and external standard method. The results showed that this method was characterized by that recovery rates of plant and tuber were 86.73%-92.58% and 86.03%-93.35%, relative standard deviation were 3.46%-8.19%and 3.65%-6.22%, respectively. LOD at 1.0×10-9 g and sensitivity of 0.001 mg/kg. The decline rules of Thiamethoxam seed coating in plant of potato followed the first order chemical reactions dynamics equation, 60 days after planting, residual quantity of Thiamethoxam was 33.975 mg/kg which was the primitive quantities of sediment, Accordingly, its half-lives were 12.4 d. Thiamethoxam were not detected in tubers under the condition of this study.