Standard Test Method for Total Nitrogen in Organic Materials by Modified Kjeldahl Method (Withdrawn 2019)doi:ASTM E258-07(2015)1.1\n本试验方法涵盖含氮有机化合物中总氮的测定.本试验方法不适用于含有N-O,N-N键的材料.\n1.2\n以国际单位制表示的数值应视为标准值.括号中给出的值仅供参考.\n1.3\n本...
The Kjeldahl is a general analysis method for determining nitrogen in rubber. 凯氏定氮法是测定橡胶中氮含量的常规分析方法。 3. [Method] The total nitrogen(N) content was determined with Kjeldahl to study the influences of temperature,digesting time and sample dosage on the course of digesting ...
1992. Chloride interference in total nitrogen analysis by the Kjeldahl method. Communications in Soil Science and Plant Analysis 23:1805-1813.Mulvaney R L, Azam F, Stein S N, et al. Chloride interfer- ence in total nitrogen analysis by the Kjeldahl method [ J ]. Commu. Soil Sei. Plant ...
Our data indicate that the difference of the TN by the two methods can serve as an independent climatic proxy. 展开 关键词: soil lake sediment nitrogen Kjeldahl method elemental analyzer method nitrogen cycle DOI: 10.1007/s11442-006-0415-5 被引量: 21 ...
Designation: D3228 − 08 (Reapproved 2014)Standard Test Method forTotal Nitrogen in Lubricating Oils and Fuel Oils by ModifiedKjeldahl Method 1This standard is issued under the fixed designation D3228; the number immediately following the designation indicates the year oforiginal adoption or, in th...
Method Improvement of Kjeldahl Method for Determination of Total Nitrogen in Soil WANG Lin Tianjin Environmental Monitoring Center, Tianjin 300191, China Abstract: total nitrogen in soils; Kjeldahl method; method improvement; soils of different types...
Total nitrogen 来自 ResearchGate 喜欢 0 阅读量: 173 作者: JM Bremner 摘要: In the Kjeldahl method, the N in the sample is converted to ammonium (NH4+) by digestion with concentrated H 2 SO 4 containing substances which promote this conversion, and the ammonium is determined from the ...
American Standard Methods ASTM E258, "Standard Test Method for Total Nitrogen in Organic Materials by Modified Kjeldahl Method", 3pp. (1967).ASTM E 258-67 (Reapproved 1987). Standard test method for total nitrogen in organic materials by modified kjeldahl method. American Society for Testing ...
Based on the present method, a novel reactor was constructed to realize routine high-throughput analyses of multiple samples such as those found for pharmaceutical materials, foods, and/or excrements. Keywords: High-throughput total nitrogen determination; colorimetric analysis; Kjeldahl method; reactor...
The precision of the proposed method was satisfactory for total N analysis of water samples, and the method appears adequate for estimation of total N in most water and waste water samples.doi:10.2134/jeq1975.00472425000400040009xD. W. Nelson...