ISO 10702-1993 钢和铁 氮含量的测定 蒸馏后滴定法

标准号：ISO 10702-1993
中文标准名称：钢和铁 氮含量的测定 蒸馏后滴定法
英文标准名称：Steel and iron; determination of nitrogen content; titrimetric method after distillation
标准类型：H11
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：H11
国际标准分类号：77.080.01
适用范围：The principle of the method specified is dissolving a test portion in hydrochloric acid followed by oxidation with hydrogen peroxide, fuming of the acid-insoluble residue in sulfuric acid with potassium sulfate and copper(II) sulfate, distilling the solution made alkaline with sodium hydroxide, collecting ammonia in a receiver containing orthoboric acid solution, titration of the ammonium ion with amidosulfuric acid. Is applicable to nitrogen contents from 0,002 % (m/m) to 0,5 % (m/m); does not apply to samples containing silicon nitride.