卡尔费休滴定水用目视观察终点有至少0.001％(wt./vol.)的水分的误差,因此,低浓度的水分测定常应用电位法指示终点。由于光度滴定的发展,进一步研究了分光光度法测定卡尔费体滴定的终点。操作步骤:吸取30—50ml甲醇至干燥的滴定装置中,在滴定时通入干燥的空气流至烧瓶中,每次中入卡尔费休试剂0.10ml,每次加过后,停止电磁搅拌,读取在525mμ的吸光,在 At least 0.001% (wt./vol.) Of moisture is visually observed at the end of a Karl Fischer titration. Therefore, low concentrations of water are often measured potentiometrically to indicate the end point. Due to the development of photometric titration, the end point of Karl Fischer titration was further studied spectrophotometrically. Steps: Pipet 30-50ml of methanol to a dry titration device, pass a dry air flow to the flask during titration, each time into the Karl Fischer reagent 0.10ml, after each addition, stop the electromagnetic stirring, read Absorbance at 525mμ, at