Study On Effect Of Methylated Oil Adjuvants On Two Pesticides Residue In Agricultural Products And Environment

It is very significant for adjuvants in enhancing pesticide control effect, increasing pesticide safety to crops, decreasing pesticide dose, reducing environment pollution and increasing economy benefit. Rooting in biology, low toxic to beneficial biology, easy disaggrega-tire, safe to crops, high effect and new type pesticide adjuvants would have better exploiture foreground. In recent years, Methylated oil adjuvants have been one of hotspots in pesticide adjuvant exploiture fields because of their basic materials rooting in plants or animals, good biologic decomposition, low toxicity and little harm to crops. In this paper, aimming at status of spray adjuvant development in China,5methylated oil adjuvants including methylated oleate adjuvant, methylated rapeseed oil adjuvant, methylated peanut oil adjuvant, methylated lard oil adjuvant and methylated turpentine oil adjuvant were confected indoors, and the enhancement effect of these5adjunvants on pesticides were measured by pot test in greenhouse to select the best one which were MAO and MLO. The enhancement mechanism of methylated oil adjuvants was primarily discussed. At the same time, the impact of surfactants on the photolysis of chlorantraniliprole in aqueous solutions was investigated.The detailed results were as follows:1. A rapid, highly sensitive, and selective method was developed for the determination of the insecticide chlorantraniliprole (CAP) in water, rice and cabbage using high performance liquid chromatography(HPLC). The analyte was extracted with dichloromethane and acetonitrile from the water, rice and cabbage, respectively. Determination and quantification of chlorantraniliprole were performed by LC with an UV detector. The average recoveries of chlorantraniliprole in tested samples were between90.2and103.7%at spiking levels of0.01,0.05and0.1mg·L-1, with relative standard deviations ranging from1.2to4.7%. The limit of detection (LOD) of the LC-UV system was1ng. The limit of quantification (LOQ) of the entire method was0.05mg·L-1, which were much lower than the maximum residue levels established by the Environmental Protection Agency of United States. 2. The methods of determination of acetamiprid residues in water, rice and cabbage were performed. For acetamiprid in water, adopted fluid-fluid assignment, extracted with methylene chloride; Residues in rice and cabbage were extracted with acetonitrile. The above extracted samples were analyzed by HPLC-UVD. The coefficients of determination (R2) of this method were found to be0.9999, and their calibration curves are linear in the range of0.1-30mg-L"1with a limit of determination being0.03mg-L"1.3. The result indicated that the surface tension of chlorantraniliprole and acetamiprid solution distinct decreased after adding methylated oil adjuvants. It also can obviously prolong dried duration of the tested pesticide solution and increase the penetration ratio of the tested pesticide.4. The deposition was increased significantly when adding adjuvants. A rainfall after spaying affected the deposition significantly. Addition of adjuvant had significantly effect on the rainfastness.5. Study on the residue dynamics of chlorantraniliprole and acetamiprid on rice and cabbage leaves. The results of detection showed that the addition of adjuvant could prolong the persistence of the pesticide, reduce the dosage and the cost of insecticide, decreasing contaminate as well.6. The impact of surfactants on the photolysis of chlorantraniliprole in aqueous solutions was investigated. The results indicated that Nongru500had photoquenching effect on photolysis of chlorantraniliprole, under300w high pressure mercury lamp. OTAC had photosensitive effect on the photolysis of chlorantraniliprole at low dosage, however, at higher dosage it had photoquenching effect. The photosensitive effect Tween80with the spiking concentration of5,10and25mg/L was16.74%,29.52%and43.17%, respectively. The self-made surfactant exhibited a photosensitive effect on the photolysis of chlorantraniliprole. The results suggested that the photosensitive effect of surfactant on the photolysis of chlorantraniliprole in water was affected by the type and dosage of surfactants.