Abstract:

A method for determining residue of tebufenozide and furan tebufenozide pesticides in soil by means of liquid chromatograph was developed. The samples were extracted by acetomintrile, purified using amino column and filtered by the organic membrane. The results showed that the recoveries were in the range of 83% and 100.5%, and furan tebufenozide were 87% to 109.5%, with RSD less than 10.2%, which indicated that the method could meet the requires for the analysis of the pesticide residue in soil. Comparing the degradation dynamics of tebufenozide and furan tebufenozide in two types of soil (sandy loam, sand), the tests showed that residues of tebufenozide and furans tebufenozide was the largest after 1 h, with the extension of the reduced interval. The degradation rate of pesticide in the sandy loam was faster than sand. Pesticide digestion equations in the sand were: tebufenozide Ct=0.847e-0.1848t,T1/2=3.75 d,R2=0.9554；furan tebufenozide Ct=0.875e-0.2895t,T1/2=2.39 d,R2=0.929， and in the sandy loam tebufenozide Ct=0.816e-0.12541t,T1/2=5.53 d,R2=0.9418；furan tebufenozide Ct=0.8657e-0.1462t,T1/2=4.74 d,R2=0.9399.

Key words: sandy loam, sand, tebufenozide, furan tebufenozide, liquid chromatography analysis, dynamic of residue