Distribution,Migration And Residue Of Triazophos In Rice And Paddy Environ Mental Media

Triazophos was regarded as object of study in this paper, and researches were launched in order to find the distribution, migration degradation, and residue in environmental media and so that evidences of evaluation of ecological environment safety was offered.Through the study of distribution, migration, residue to triazophos in environmental media of the rice fields, it indicated that:after the first application, distribution ratio of triazophos in environmental media was:plant> soil> water. After three days from applying pesticide, concentrations of triazophos in plant and water descent to some extent and the distribution ratio was soil>plant> water. Sampling before the2nd and3rd application and sampling in the last time, the distribution ratio of triazophos was always soil> plant. In later stage of rice growth, the concentration of triazophos was low in water because of the interception effect of the upper rice. Detecting to the air sample after the1st application, it indicated that concentration of triazophos was highest in the2nd air sample, and then decreased gradually.During the field test, total inputs of triazophos were6.831g, and measured quantity of triazophos at the last time was0.303g, which took4.44%by the total inputs. An amount of0.051g of triazophos was contained in the last time sampling ear, which took0.75%by the total inputs. And applying pesticide directly on ear of rice could cause the residue of triazophos in ear of rice mainly.The degradation of triazophos in soil and water system showed that level-dynamic equation of degradation was Ct=4.143e"0039t with R2=0.9736, and half-life was17.8days. The soil adsorption test result showed that the concentrations of triazophos in water and soil was expressed a good linear relationship, and the absorption characteristics fitted Freundlich equation well and value of soil adsorption constants Kd was21.46,Koc was363.7in the tested soil, and it belonged to the ’low mobility pesticide’. The field test experiment results showed that triazophos residue in the soil were in part due to the adsorption effect. Rainfall simulation test results show that the concentration of triazophos in plant reduced by34%, and in soil it increased by4%and in water it also increased by14%, which indicated that rainfall had played an important role in residue of triazophos in rice plant.