饮用水中P碱度和M碱度检测方案(自动电位滴定)

饮用水的P碱度和M碱度的测定 应用资料在样品中加入硫代硫酸钠和酚酞指示剂后，用0.01mol/L硫酸滴定测定饮用水的P碱度。终点由指示剂颜色变化的拐点决定。然后，在样品中加入甲基红指示剂后，再次用0.01mol/L硫酸滴定M碱度。终点由指示剂颜色变化的拐点决定。KGM KYOTO ELECTRONICSMANUFACTURING CO.，LTD.TIF-94006enLK-MKYOTO ELECTRONICSMANUFACTURING CO.，LTD. Application Memo P and M Alkalinity of Drinking Water IndustryFood & beverageInstrumentAutomatic potentiometric titratorMeasurement methodAcid-base titrationStandardsGB/T 15451 1.Overview P alkalinity of drinking water is measured by titration with 0.01mol/L sulfuric acid afteradding sodium thiosulfate and phenolphthalein indicator to the sample. The endpoint isdetermined by the inflexion point where the indicator color changes. Then， M alkalinity is titrated again with 0.01mol/L sulfuric acid after adding methyl redindicator to the sample. The endpoint is determined by the inflexion point where the indicatorcolor changes. 2. Apparatus Main unit Automatic potentiometric titrator (preamplifier PTA) Electrode Photometric sensor， Interference filter (530nm) 3. Reagents Titrant 0.01mol/L sulfuric acid Additive Sodium thiosulfateIndicator Phenolphthalein (for P alkalinity)， Methyl red (for M alkalinity) 4. Example -Measurement results一 (P alkalinity only) Sample Titer Alkalinity (mL) (mL) 1 50.0 0.3196 0.3196 2 50.0 0.3188 0.3188 3 50.0 0.3171 0.3171 Average 0.3184 SD 0.0013 RSD(%) 0.40 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