ISO 4326-1980 非离子表面活性剂 聚乙氧基化衍生物 羟值的测定 乙酐法

标准号：ISO 4326-1980
中文标准名称：非离子表面活性剂 聚乙氧基化衍生物 羟值的测定 乙酐法
英文标准名称：Non-ionic surface active agents; Polyethoxylated derivatives; Determination of hydroxyl value; Acetic anhydride method
标准类型：G72
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：G72
国际标准分类号：71.100.40
适用范围：The hydroxyl group is esterified by acetic anhydride in pyridine solution. The excess of acetic anhydride is hydrolized with water. The acidity which appears during the esterification and the acetic acid formed during the hydrolysis are neutralized by sodium hydroxide solution in the presence of phenolphthalein as indicator. The hydroxyl value is calculated from the difference between the volume od sodium hydroxide solution used for the titration of the blank and of the test solution.