硬质合金中钴含量的测定 应用资料

硬质合金中钴含量的测定 应用资料样品溶解在硝酸和氢氟酸中后，加入纯水、柠檬酸铵和氨水。冷却后，用1/30mol/L铁氰化钾滴定至终点，即滴定曲线上的最大拐点，测量样品溶液中的钴。钴的浓度是根据铁氰化钾的滴定体积来计算的。其原理是通过使用铁氰化钾在强氨溶液中将钴(II)氧化为钴(III)进行定量分析。KGMKYOTO ELECTRONICSMANUFACTURING CO.，LTD.TIN-97001enL Application Memo Cobalt in Cemented Carbide Industry Iron and steel Instrument Automatic potentiometric t itrator Measurement method Redox t i tration Standards CIS 032B (Former Japan Cemented Carbide Tool Manufacturer's Association’s standards)， GB/T 5124.3 1.Overview After the sample is dissolved in the nitric acid and hydrofluoride acid， add pure water，ammonium citrate， and ammonia water to i t. After cooling， cobalt in the sample solution i s measured by t itration with 1/30mol/L potassium ferricyanide up to the endpoint ， which is the maximum inflexion on the titration curve. Cobalt concentration is calculated from t he titration volume of potassium ferricyanide. The principle is quant i fication by oxidizing cobalt (I I ) to cobalt (ⅢI ) i n strong ammonia solution using potassium f erricyanide. 2. Apparatus Main unit Automatic potentiometric titrator (preamplifier STD) Electrode Platinum electrode Ceramic reference electrode 3. Reagents Titrant 1/30mol/L potassium ferricyanide (potassium hexacyanoferrate (II ))solution Solvent Pure water， Nitric acid (1+1)， Hydrofluoride acid，Ammonia water， Ammonium citrate 4. Example —Measurement results一 — Sample Titer Cobalt (g) (mL) (%) 1 0.2370 9.6125 8.054 2 0.2265 9.1946 8.061 3 0.2410 9.7968 8.072 Average 8.062 SD 0.009 RSD(%) 0.1 —Titration curve厂 Please feel free to contact us for any further i nformation. 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： 021-54488867 电邮： kemu-kem@163.com 网址： http：//www.kem-china.com