浓缩柠檬汁中总酸检测方案(自动电位滴定)

浓缩柠檬汁中总酸的测定 应用资料果汁总酸的测定通常通过使用玻璃电极的电位酸碱滴定来实现。加入纯水后，用0.1mol/L氢氧化钠滴定至pH8.2，滴定体积转化为柠檬酸。含有浓缩柠檬汁等颗粒的果汁需要过滤。KGM KYOTO ELECTRONICSMANUFACTURING CO.，LTD.TIZ-99261enL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.comK-MKYOTO ELECTRONICSMANUFACTURING CO.，LTD. Application Memo Acidity of Concentrated Lemon Juice Industry Food & beverageInstrument Automatic potentiometric titratorMeasurement method Acid-base titrationStandards GB 12456，ISO750 1.Overview Determination of acidity of fruit juice is popularly practiced by potentiometric acid-basetitration using a glass electrode. After pure water is added， titrate with 0.1mol/L sodiumhydroxide up to pH8.2， and the titration volume is converted to citric acid. Juices containinggranules such as concentrated lemon juice requires filtering. 2. Apparatus Main unit Automatic potentiometric titrator (preamplifier STD)Electrode Combined glass electrodeTemperature compensation electrode 3. Reagents 4. Example —Measurement resultsS一 Sample Titer Acidity (g) (mL) (w/w%) 1 4.999 49.4754 6.316 2 4.994 49.4444 6.318 3 4.998 49.4588 6.315 Average 6.317 SD 0.002 RSD(%) 0.03 Please feel free to contact us for any further information. Kyoto Electronics Manufacturing Co.， Ltd. Overseas Sales & Marketing Sect.