农药中硼酸含量检测方案(自动电位滴定)

智能文字提取功能测试中

农药中硼酸含量的测定 应用资料农药中的硼酸定量如下。将D-甘露醇和水加入样品中提取后，用氢氧化钠滴定至终点。硼酸直接滴定是困难的，因为硼酸几乎不解离酸。多元醇如甘露醇与硼酸形成络合物并释放氢离子。该操作使硼酸的中和滴定成为可能。终点是滴定曲线上的拐点。农药中的硼酸由滴定体积计算得出。TIM-99413enLK-MKYOTO ELECTRONICSMANUFACTURING CO.，LTD. Application MemoBoric Acid in Pesticide Industry Agricultural chemicalsInstrument Automatic potentiometric titratorMeasurement method Acid-base TitrationStandards ISO 6353-3，GB/T 12684 1.Overview Boric acid in boric acid dumplings is quantified as follows. After D-mannitol and water areadded to the sample for extraction， it is titrated with sodium hydroxide up to the endpoint.Direct titration for boric acid is difficult because boric acid hardly dissociates acid. Polyolssuch as mannitol form complexes with boric acid and liberate hydrogen ions. This operationmakes neutralization titration for boric acid possible. The endpoint is the inflexion point onthe titration curve. The boric acid in pesticide is calculated from the titration volume. 2. Apparatus Main unit Automatic potentiometric titrator (preamplifier STD) Electrode pH glass electrode Ceramic reference electrode Temperature compensation electrode 3. Reagents Titrant lmo1/L sodium hydroxide SolventPure waterReagentD-mannitol 4.Example Sample Titer Concentration (g) (mL) (%) 1 2 3 2.0148 4.8610 14.932 2.0060 4.9123 15.156 2.0145 4.8974 15.046 AverageSD RSD(%) 15.045 0.112 0.744 8.008[mL]-Titration curve一 Please feel free to contact us for any further information. Kyoto Electronics Manufacturing Co.， Ltd. Overseas Sales & Marketing Sect. 京都电子工业株式会社-可睦电子(上海)商贸有限公司 上海市徐汇区宜山路333号1201室 电话：021-5448886 7 电邮： kemu-kem@163.com网址 ： http：//www.kem-china.com