标准摘要
[中文适用范围]： 规定的方法适用于 HCHO 含量在 25±5% 和 45% 之间。 通过适当改变测试部分的质量可以扩展应用领域。 原理在于测试溶液与中性亚硫酸钠溶液反应，并在百里酚酞作为指示剂存在下对释放的氢氧化钠进行酸滴定。 [外文原描述]： The specified method is applicable to HCHO contents between 25 5 and 45 %. The field of application may be extended by siutably modifying the mass of the test portion. The principle consists in the reaction of the test solution with a neutral sodium sulphite solution, and acidimetric titration of the liberated sodium hydroxide in presence of thymolphthalein as indicator.
英文名称Formaldehyde solutions for industrial use — Determination of formaldehyde content