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Study on Residue Dynamics and Photodegradition of Chlorpyrifos and Chlorothalonil in Pepper of Greenhouse and Field

Author: NiuDaShui
Tutor: HuaRiMao
School: Anhui Agricultural University
Course: Environmental Engineering
Keywords: Chlorothalonil Chlorpyrifos Chili Photolysis Greenhouses Open field
CLC: X592
Type: Master's thesis
Year: 2010
Downloads: 104
Quote: 2
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Abstract


Established chlorpyrifos and chlorothalonil residue analysis method in the chili, chlorothalonil and chlorpyrifos residue of pepper in the open field and greenhouses stress environment Degradation dynamics; chlorothalonil and chlorpyrifos in chili surface photolysis experiments, the use of The high-pressure mercury lamp of sunlight and artificial light chlorothalonil and chlorpyrifos the pepper surface of photochemical degradation regularity. Pepper chlorpyrifos and chlorothalonil with acetonitrile extraction, Florisil column chromatography purification with n-hexane, concentrated constant volume. Sample measured by gas chromatography (ECD). The minimum detectable amount of chlorpyrifos 0.01ng, The pepper chlorpyrifos minimum detectable concentration was 0.005 mg / L, the added concentration of 0.01 mg / kg ~ 1.0 mg / kg, peppers recovery rate of 84% -90%, the variation coefficient of 2.84% -4.53%; minimum detectable amount of chlorothalonil 0.1ng, chlorpyrifos pepper minimum detectable concentration of 0.01mg / L, add a concentration of 0.01 mg / kg ~ 1.0 mg / kg, pepper recoveries up to 83% -98%, the coefficient of variation of 2.45% -3.42%. Using a syringe add pepper surface chlorpyrifos and chlorothalonil, research Photodegradation of both pesticides in pepper surface. The pepper surface of chlorpyrifos and chlorothalonil was extracted with acetonitrile, the added concentration of 0.1 mg / kg ~ 10 mg / kg, pepper recoveries up to 84% -94%, coefficient of variation of 2.38% -4.25%; 100 bacteria Qing add a concentration of 0.1 mg / kg to 1.0mg/kg, peppers recovery rate of 96% -102%, coefficient of variation of 2.49% -3.3%, in line with the requirements of the pesticide residue analysis. Chlorpyrifos and chlorothalonil in greenhouses and open field pepper the degradation dynamics were measured. In July, chlorpyrifos greenhouses pepper degradation half 1.4d, the degradation half in the open field pepper 0.8d; chlorothalonil pepper greenhouses the degradation half of 2.2d the exposed ground pepper degradation half-life of 1.7 d; November, chlorpyrifos greenhouses degradation half of the pepper 5.3d, the degradation half of the exposed ground pepper 3.1d; chlorothalonil pepper greenhouses the degradation half of 3.1d pepper degradation in the open field The half-life of 2.2d. Description chlorothalonil and chlorpyrifos pepper the degradation rate is faster in the open field in the degradation rate of the peppers in greenhouses, and chlorothalonil and chlorpyrifos degradation rate in July is faster than the rate of degradation of November. Different thickness film chlorothalonil and chlorpyrifos in the the pepper surface of photochemical degradation in sunlight and high-pressure mercury lamp two light sources, chlorothalonil and chlorpyrifos in film, the thickness 0.06mm thin film, and the thickness of 0.12mm thin-film optical degradation half-lives are expressed as: 0.12mm thickness of the film gt; 0.06mm-thick film gt; film. Chlorothalonil and chlorpyrifos in a high-pressure mercury lamp photolysis rate than the sun under the fast decrease with the increase of the original concentration; chlorothalonil and chlorpyrifos degradation half-life in a different color pepper performance: red pepper gt; Huang chili gt; Green pepper; different color pepper, chlorothalonil and chlorpyrifos alone when degraded faster than the two pesticides mix.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Agricultural chemicals,toxic chemicals, pollution and its prevention
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