Degradation of octachlorodipropyl ether in different soils
The analytical method of octachloropropyl ether(OCDPE) residue in soil was developed,and the degradation and dissipation of OCDPE residues in soil were studied in laboratory and field experiment.Soil sam-ple was extracted with ethyl acetate by ultrasonic vibration,detected by GC-ECD.Recoveries and RSDs(relative standard deviations) of OCDPE in soil(the concentrations of OCDPE fortified in soil were 0.01~1.0 mg·kg-1) were 82.3%~101.5% and 7.4%~9.9%,respectively.At initial concentration of 1.0 mg·kg-1,the half-lives(t1/2) of OCDPE in red soil,yellow cinnamon soil,lime concretion black soil were 24.40 d,38.50 d and 21.93 d,respec-tively.At initial concentration of 10.0 mg·kg-1,the half-lives were 23.41 d,39.15 d and 24.06 d,respectively.The half-lives of OCDPE in yellow cinnamon soil with the moisture of 40%,60% and 80% of field water capacity were 49.15 d,38.50 d and 35.91d,respectively.The dissipation dynamic of OCDPE in tea garden soil followed an apparent first-order kinetic model.The dynamic equation of OCDPE was Ct =4.152 4e-0.1198t,and the dissipation half-life was 5.78 d.The results are of great significance in the study of environment fate and safety evaluation of OCDPE in soils.