Study On Degradation And Adsorption Of A Novel Acaricide F1050

Pesticide is one kind of nessary means of production in agriculture, however it will do harm to people's health and ecological environment because of its unreasonable application. Before a new pesticide is to extend,it is wholly essential to know its degradative tendency in environment and organism.A novel acaricide F1050 was invented by Zhejiang institute of chemical industry R&D South Center and Shanghai Institute of Organic Chemistry Academia Sinica. The bioassay results showed that it was effective to kill mite. It was proved to be more sensitive to the mite than others and tobe lethal active against the growth at various mite stages.The photodegradation dynamics of F1050 in different organic solvents and was studied under different light sources ( =254nm and =365nm) .The photolysis rates of F1050 were in the order of methanol>n-hexane>acetonitrile .When the light wave length was increased from 254nm to 365nm,the photolysis rate of F1050 was decreased.When fortified on the level of 5% and 10% acetone, the half lives increased 1.47 and 2.26 fold respectively. While fortified on the level of 0.5% and 1% H2O2, the photolytic half lives of F1050 were decreased as 4.79 and 5.68 times. Two possible photolytic products of F1050, N-(2-methyl-henyl)-2,4-dinitryl-6-trifluoromethyl-aniline and2,4-dinitryl-6-trifluoromethyl-aniline, were determined by GC-MS.Results of hydrolysis study showed that the first-order rate constants(k) were dependent on pH values. F1050 was relatively stable in neutral buffer solutions. The hydrolysis rates of it were in the order of pH11>pH5>pH9>pH7. When temperature increased from 25 to 35 ,the half life decreased ranged from 1.52%-19.64%.The adsorption of F1050 in three types of soil(sandy loam, clay loam and loam sand) conformed to Freundlich equation. The Kf values increased with increasing organic carbon content of the soils. On the other hand, the behavior of F1050 in the soil was affected by pH and clay content. As pH decreased, F1050 was more strongly adsorpted, and its mobility was reduced.The results of trials of F1050 residue indicated that F1050 was degraded in soil and orange gradually,and half lives were at the ranges of 41.26-49.51 days in soil and 4.39-16.62 days in orange.