Dissipation of thiamethoxam residue in tea and green tea processing.

The dissipation of thiamethoxam 25% WG residue in green tea shoots and green tea processing was investigated.The results showed that the dissipation dynamics of thiamethoxam were followed first order kinetic equation at different application treatments in tea.The green tea processing resulted in a residue degrada-tion of 1.2%-22.7%,and the average of degradation rate is 8.2%.The dissipation rates were identical in the dif-ferent application treatments.The dissipation coefficient(k) was 0.431 8±0.002 0.Half-life of thiamethoxam was found to be 1.56-1.62 days in green tea shoots and 1.60-1.64 days in green tea,and T0.99 from 10.18 to 10.49 days respectively.