Study On Determination Of Pesticide Residues In Soil And The Conduct Of Organophosphorous Pesticide Degradation

In recent years, the amount of used pesticides is increasing, which made a multitude of pesticides go into the system of soil and caused serious pollution. Our country is an agricultural country which has a large amount of products and uses a large deal of pesticides. Some high poisonous pesticides were used extensively, and it caused our country to face the serious pesticide pollution problem. As the dependency of pesticides, the soil major pollution is the organic pesticide pollution. Now, the organophosphorous pesticides are used widely and are the major matters caused the soil and water pollution. Enhancing the research on method of organic pesticide residue has theoretic meaning and important directive value. So it will has the important practical meaning of investgating the methods of degrading the organophosphorous pesticides into avirulent substances. The main achievement in this paper is as following:1. A method for the determination of organophosphorous and carbamate pesticide residues in soil was performed by GC-MS. With acetone and petroleum ether (4:1,v:v), pesticide residues in soil were extracted ultrasonically, followed by clean up with Florisil column, and analyzed by GC-MS. The recoveries obtained from samples spiked with standards at the concentration levels of 0.1 μg/mL and 0.5μg/mL were in the ranges of 70.1%~ 119.0% and 78.1%—119.1% with relative standard deviations of 6.30%~9.80% and 5.20%~8.23%. The method has been applied to the analysis of samples with satisfactory results.2. A method for the simultaneous determination of organochlorine and pyrethroid pesticides in soil samples was developed. The detection limits of organochlorine pesticides were 0.001 ~0.003μg /mL, the detection limits of pyrethroid pesticides were 0.008~0.02μg /mL, the relational coefficient were between 0.9978—0.9999. With eluent using petroleum ether and acetone (3:1) and purification using florisil. The recoveries obtained for organochlorine pesticides ranged from 94.2.0% to...