论文部分内容阅读
用气相色谱法检测拟除虫菊酯类农药——氰戊菊酶在甘兰及蕃茄上的残留。样品用石油醚、丙酮(1+1)提取,苯—乙酸乙酯通过弗罗里硅土淋洗净化。色谱分析用0.8m×3mm玻璃柱填充涂有3%ov—101的 Gas Chrom Q 担体(80—100目)用电子捕获检测器,一般可检出氰戊菊酯的最小检出量为0.87×10~(-11)克。同时研究提出氰戊菊酯在甘兰和番茄上的安全使用方法。在甘兰生长期喷施40ppm 氰戊菊酯溶液,喷药后11天,药液在甘兰上消失90%以上,残留半衰期约2.9—3.7,甘兰的生长稀释,降低了甘兰中的农药残留水平。在生长期喷施20%氰戊菊酯乳油25—40毫升/亩.施药2—3次,间隔期5天,在甘兰中的农药残留量低于1.0mg/kg(允许残留量)。在夏季,番茄生长期喷施60ppm 的氰戊菊酯溶液,喷药后8天,药剂在番茄果上消失80%以上,残留半衰期约为2.3天。喷施20%氰戊菊酯乳油30—40毫升/亩,用药2次,间隔期3天在番茄全果中的农药残留量低于0.2mg/kg(允许残留量)。
Gas chromatography for pyrethroid pesticide - fenvalerate in cabbage and tomato residues. Samples were extracted with petroleum ether and acetone (1 + 1), benzene-ethyl acetate was purified by Florisil. Chromatography A Gas Chrom Q carrier (80-100 mesh) coated with 3% ov-101 was packed with a 0.8 m x 3 mm glass column using an electron capture detector. The minimum detectable amount of fenvalerate was generally found to be 0.87 x 10 ~ (-11) grams. At the same time, the safe use of fenvalerate in cabbage and tomato was proposed. In the cabbage growth period spraying 40ppm fenvalerate solution, spraying 11 days after the drug solution on cabbage disappeared more than 90%, the remaining half-life of about 2.9-3.7, the growth of cabbage diluted, reducing the cabbage in Pesticide residue levels. Spraying 20-40% of fenvalerate EC in the growing season 25-40 ml / mu Application 2-3 times, 5 days apart, pesticide residues in cabbage below 1.0 mg / kg (allowable residues) . In the summer, 60 ppm of fenvalerate solution was sprayed in tomato growth stage. After 8 days of spraying, the agent disappeared more than 80% in tomato fruit and the residual half-life was about 2.3 days. Spraying 20% fenvalerate EC 30-40 ml / mu, medication 2 times, the interval of 3 days in tomato whole fruit pesticide residues less than 0.2mg / kg (allow residue).