ISO 787-4-1981 颜料和体质颜料的通用试验方法 第4部分:水萃取酸度或碱度的测定

标准号：ISO 787-4-1981
中文标准名称：颜料和体质颜料的通用试验方法 第4部分:水萃取酸度或碱度的测定
英文标准名称：General methods of test for pigments and extenders; Part 4 : Determination of acidity or alkalinity of the aqueous extract
标准类型：G53
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：G53
国际标准分类号：87.060.10
适用范围：The principle of the method consists in the hot extraction of the material by following the procedure specified in ISO 787/3, to the stage of obtaining a perfectly clear filtrate. The determination is carried out with indicator solution (method A). If the solution with the methyl red indicator is yellow (alkaline), titrate it with the hydrochloric acid solution to an orange end-point; if the solution with the methyl red indicator is red (acid), titrate it with the sodium or potassium hydroxide solution to an orange end-point. The other method (method B) is the potentiometric determination. Take 100 ml of the test solution, insert the electrodes of the pH measuring device and read the pH value.