ISO 5315-1984 肥料 氮总含量的测定 蒸馏后滴定法

标准号：ISO 5315-1984
中文标准名称：肥料 氮总含量的测定 蒸馏后滴定法
英文标准名称：Fertilizers; Determination of total nitrogen content; Titrimetric method after distillation
标准类型：G20
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：G20
国际标准分类号：65.080
适用范围：The method consists in reducing of nitrate to ammonia by chromium powder in acid medium, converting of organic and urea nitrogen into ammonium sulfate by digestion with concentrated sulfuric acid in the presence of a catalyst, distilling of the ammonia from an alkaline solution and absorbing in an excess of standard volumetric sodium hydroxide solution. The method is not recommended for materials containing more than 7 % of organic matter.