电镀溶液中三价铬含量检测方案(自动电位滴定)

电镀溶液中三价铬含量的测定 应用资料向稀释后的样品中加入20%氢氧化钠和过氧化氢后，缓慢煮沸并冷却。加入纯水、氟化铵、3mol/L硫酸和碘化钾后，用0.1mol/L硫代硫酸钠溶液滴定测定三价铬浓度。终点是滴定曲线上的最大拐点。根据硫代硫酸钠的滴定体积，计算出了三价铬的浓度。KGM KYOTO ELECTRONICSMANUFACTURING CO.，LTD.TIQ-96075enL-K-MKYOTO ELECTRONICSMANUFACTURING CO.，LTD. Application Memo Determination of Trivalent Chromium in Nickel PlatingSolution Standards Industry Non-ferrous metalInstrument Automatic potentiometric titratorMeasurement method Oxidation reduction titration GB/T26108，JB/T 11616 1.Overview After adding 20% sodium hydroxide and hydrogen peroxide to the diluted sample， slowly boilit and cool. After adding pure water， ammonium fluoride， 3mol/L sulfuric acid and potassiumiodide to it， trivalent chromium concentration is measured by titration with the 0.1mol/Lsodium thiosulfate solution. The endpoint is the maximum inflexion on the titration curve. Thetrivalent chromium concentration is calculated from the titration volume of sodiumthiosulfate. 2. Apparatus Main unitAutomatic potentiometric titrator (preamplifier STD) Electrode Platinum electrode Ceramic reference electrode 3. Reagents Titrant 0.1mol/L sodium thiosulfate solution Solvent Pure waterAdditive 20% sodium hydroxide， Hydrogen peroxide， 3mol/L sulfuric acid (6N) Ammonium fluoride， Potassium iodide 4. Example -Measurement results- Concentration (g/L) AverageSD RSD(%) 2.6696 0.3763 14.10 -Titration curve- 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：021-54488867 电邮： kemu-kem@163.com 网址： http：//www.kem-china.com