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滴定分析中用显色剂指示终点占有很重要的地位,如改用仪器替代目视,则更为灵敏、准确,因此不断有文献报导这方面的工作。早期的光度滴定装置,Headridge、Underwood、Leonard等已有介绍。采用两个不同波长进行光度滴定,具有不少优点,为分析工作者所重视。从结构来看,它又可分为:用两束光通过溶液和把一束透射光分裂成两束两种类型。用两束光通过溶液的工作,主要有:Ringbom等人选择“对应波长”,在无吸收物时调节光栏使光
In the titration analysis, it is very important to indicate the end point with the reagent. If the equipment is replaced by the visual instrument, it will be more sensitive and accurate. Therefore, there are some reports of this work. Early photometric titration devices, Headridge, Underwood, Leonard, etc., have been introduced. Photometric titration with two different wavelengths has many advantages that are paramount to analysts. From the structure point of view, it can be divided into: two beams of light through the solution and a beam of light split into two beams of two types. Working with two beams of light through the solution, there are: Ringbom et al. Select “Corresponds to Wavelength” and adjust the lightbar to light when there is no absorbance