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航标HB/Z61—92第6.8.4.2C节中规定,使用中的亲水乳化剂溶液应每周用折光仪测试一次,与未使用过的溶液浓度进行比较,若浓度变化相差3％时,则该乳化剂为不合格。本文介绍折光仪的正确使用,以供同行参考。 1 基本原理 根据折射定律,光从一种介质进入到另一种介质时在界面上会发生折射,而且,溶液的浓度不同,在介质中传播速度不同,折射率也就不同,折光仪即依此原理制成的,其外形如图1所示。光线经棱镜1进入棱镜2中,从目镜3可观察到视野中有明暗分界线,该分界线的不同刻度显示出液体的不同浓度值。
Section 6.8.4.2C of Aids HB / Z61-92 stipulates that the hydrophilic emulsifier solution in use should be tested once a week with a refractometer to compare with the concentration of unused solutions. If the concentration changes by 3% Then the emulsifier is unqualified. This article describes the correct use of refractometers for peer reference. 1 The basic principle According to the law of refraction, light from one medium into another when the medium will be refracted at the interface, and the concentration of the solution in the medium of different speed of transmission, the refractive index is different, Refractometer that according to This principle is made, its appearance shown in Figure 1. The light enters the prism 2 through the prism 1, and from the eyepiece 3, there is a bright and dark dividing line in the field of view. Different scales of the dividing line show different concentration values of the liquid.