Study On Eluviation And Photolysis Of Carbendazim Regularity In Soil

With the rapid development of the economy、industry and agriculture, people’s living standards improve continuously, but more and more environmental pollution problems affecting people’s quality of life. Pollutants found in large of people living environment, such as organic pollutants, heavy metal, vehicle exhaust, and threat to human body health. Especially,the agricultural production on people of pesticides that will directly affect people’s health. Excessive and unreasonable use of pesticides Will make it a lot remain in the environment, even Volatility in the air, remain in fruit and vegetable or into the soil on the move.Environmental behavior of pesticides has a lot of kinds in soil, Leaching and photolysis have certain influence on the pesticides in the environment. Through the research of pesticides in soil leaching and photolysis will know the dynamic and migration rule in the environment. These studies can be as pesticide residue in the environment of the important basis for evaluation.This article chooses carbendazim as a representative of the pollution feature pesticide, to carbendazim in the soil of leaching and photolysis conduct exploration test. Adopt the Chloroform extraction carbendazim in the soil and water. With high performance liquid chromatography (HPLC) method for the extraction of the samples to Research carbendazim in the soil of leaching transfer characteristics and photolysis rule. Through a large number of experimental research results are as follows:(1) Through the experimental study found the solution to shower acid and alkaline soil carbendazim leaching of behavior has a certain effect, the influence of leaching solution pH to carbendazim In turn is pH=4>pH=7>pH=11. When leaching solution pH decreases, and carbendazim leaching out increase quantity, soil carbendazim down the migration deep. Use the soil solution as leaching solution,it will block the migration of carbendazim in soil. Select100mg,200mg sprain weight, and simulation Different rainfall intensity To carbendazim in leaching, the leaching out quantity of carbendazim in leaching speed of4.16ml/min than carbendazim leaching leaching speed of1.67ml/min1.62.1times as big. Leaching speed and carbendazim in the soil of a residual inverse ratio. By the use of the continuous leaching and discontinuous leaching two ways to rainfall simulation of time interval carbendazim leaching of found, the continuously leaching mode carbendazim leaching of leaching out more than intermittent, leaching uninterrupted time for1h,2h,5h, intermittent5h carbendazim leaching out the minimum amount that leaching time interval more long more carbendazim against the leaching. The composition of the soil carbendazim leaching also impact, especially humic acid content on carbendazim leaching influence, humic acid content the higher the easy adsorption carbendazim, increases in soil was the residues of spirit.(2) Different light source radiation from the different wavelength, and the experimental uses of three kinds of light sources to degradate carbendazim, the decomposition rate size is as follows:high-pressure mercury lamp> uv lamp>the sun’s rays. The shorter the wavelength of Radiation from the light source,the better carbendazim photolysis. Carbendazim in high-pressure mercury lamp illumination, the decomposition rate increased with the temperature rises, in the experiment of5temperature, When the temperature is40℃, the degradation of carbendazim fastest, half-life reduced to7.47h. Experimental results show that in the acid and alkaline environment, the photolysis rates of carbendazim are both increasing, H+and OH-ions will promote carbendazim degradation, but carbendazim relatively stable in neutral environment.The increase of soil moisture content can enhance the transference of pesticides in the soil. In the test of the soil moisture content is10%,20%,30%, when the soil moisture content, the bigger the spirit was the photolysis speed is quicker,positive correlation between both.