【英文标准名称】: Standard Test Method for Total Nitrogen in Organic Materials by Modified Kjeldahl Method 【原文标准名称】: 用改进的基尔达斯(Kjeldahl)法测定有机材料中总氮含量的试验方法 【标准号】: ASTM E258-2007 【标准状态】: 现行 【国别】: 【发布日期】: 2007 【实施或试行日期】: 【发布单位】: 美国材料与试验协会(US-ASTM)【起草单位】: E15.01【标准类型】: (Test Method)【标准水平】: ()【中文主题词】: 分析;化学分析和试验;化合物;基尔达斯法;材料;氮;测试【英文主题词】: modified Kjeldahl method; nitrogen; organic materials【摘要】: This test method may be used to determine the total nitrogen content of certain unknown organic samples, or to assay known nitrogen containing organic compounds. This test method may be used on organic materials in which the complete conversion of nitrogen to ammonium sulfate can be accomplished by digestion in a mixture of sulfuric acid, potassium sulfate, and mercuric oxide. It cannot be used on materials containing Nx2013;O, Nx2013;N linkages. This test method assumes that ammonia can be quantitatively measured by distillation from an alkaline solution into a measured volume of standard acid.1.1 This test method covers the determination of total nitrogen in nitrogen-containing organic compounds. This test method is not applicable for use on materials containing N-O, N-N linkages.1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.Note 18212;Another method of restricted application is given in Test Method D 1013.【中国标准分类号】: A43【国际标准分类号】: 71_080_30【页数】: 4P.;A4【正文语种】: 作者: jessiehx 时间: 2017-1-4 15:00:05