电解液中游离硫酸含量的测定 应用资料

电解液中游离硫酸含量的测定 应用资料电解液中游离硫酸的浓度通过电位滴定法测定。首先加入纯水和10w/v%氟化钾，用1mol/L氢氧化钠滴定至终点。终点是滴定曲线上的最大拐点。游离硫酸的浓度由氢氧化钠的滴定体积得出。当电解质溶液中存在铝离子和铁(Ⅲ)离子时，会产生氢氧化物，导致过量滴定。通过添加氟化物来掩盖这些离子，以防止过量滴定。KGMKYOTO ELECTRONICSMANUFACTURING CO.，LTD.TIO-94007enL Application Memo Free Sulfuric Acid in Electrolyte 1.Overview The concentration of free sulfuric acid in the electrolytic solution is determined by potentiometry of the test sample. First add pure water and 10w/v% potassium fluoride， and titrate with 1mol/L sodium hydroxide up to the endpoint. The endpoint is the maximum inflexion point on the titration curve. The concentration of free sulfuric acid is obtained from the t itration volume of sodium hydroxide. When aluminum ion and i ron (ⅡII) ions exist in the electrolyte solution， hydroxide is generated and it leads to excessive t itration. These ions are masked by adding f luoride to prevent an excessive titration. 2. Apparatus Main unit Automatic potentiometric t itrator (preamplifier STD) pH glass electrode Electrode Ceramic reference electrode 3. Reagents Titrant 1mol/L potassium hydroxide Solvent Pure water， 10w/v% potassium f luoride 4. Example Sample (mL) Free sulfuric acid (g/L) 1 5.0 151.48 2 5.0 151.24 3 5.0 151.21 Average 151.31 SD 0.15 RSD(%) 0.10 Please feel free to contact us for any further i nformat i on. 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： 021-544888 67 电邮： kemu-kem@163.com