标准摘要
[中文适用范围]： 半定量方法的规范。 当必须考虑金属嵌件的腐蚀或与制品接触的污染时，模制品中游离氨的含量非常重要。 从粉末状测试部分中蒸馏水提取物，通过与纳氏试剂反应对馏出物进行着色，并将颜色与标准匹配溶液的颜色进行比较。 [外文原描述]： Specification of a semi-quantitative method. The content of free ammonia in a moulded article is of importance, when corrosion of metal inserts or contamination in contact with the article has to be considered. Distillation of the aqueous extract from a powdered test portion, coloration of the distillate by reaction with Nessler reagent and comparison of the colour with that of standard matching solutions.
英文名称Plastics — Phenol-formaldehyde mouldings — Determination of free ammonia and ammonium compounds — Colorimetric comparison method