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一、主要仪器和试剂 751型或72型分光光度计重氮化试剂:对硝基苯胺1.0克、无水碳酸钠0.6克及亚硝酸钠0.4克共溶于1升蒸馏水中。临用时,将此液加浓盐酸(体积比11:1)即可,应用液于冰箱内保存10天仍有效。呋喃丹标准品:若无现成纯品,可自行精制。方法:取呋喃丹颗粒剂若干,丙酮多次浸提,活性炭脱色、过滤、蒸去溶剂,用无水乙醇重结晶,得白色晶体,用蒸氨法测定,纯度
First, the main instruments and reagents 751 or 72 Spectrophotometer Diazotization reagent: p-nitroaniline 1.0 grams, 0.6 grams of anhydrous sodium carbonate and 0.4 grams of sodium nitrite were dissolved in 1 liter of distilled water. Pro use, the liquid plus concentrated hydrochloric acid (volume ratio of 11: 1) can be applied to the refrigerator to save 10 days is still valid. Carbofuran standard: If there is no ready-made pure, can be refined on their own. Methods: Several samples of carbofuran granule, multiple extraction of acetone, decolorization of activated carbon, filtration, evaporation of solvent and recrystallization from absolute ethanol gave white crystals, which were determined by steam ammonia method and purity