MODIFIED DIACETYL MONOXIME METHOD FOR COLORIMETRIC DETERMINATION OF UREA IN SOIL EXTRACTS

被引：162

作者：

MULVANEY, RL

BREMNER, JM

机构：

[1] Department of Agronomy, Iowa State University, Ames, Iowa

来源：

COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS | 1979年 / 10卷 / 08期

关键词：

diacetyl monoxime; soil extracts; urea;

D O I：

10.1080/00103627909366969

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Some batches of H2PO4 contain impurities that affect colorimetric determination of urea in soil extracts by the method of Douglas and Bremner, which involves measurement of the red color formed when an aliquot of extract is heated with diacetyl monoxime and thiosemicarbazide in the presence of H3PO4 and H2SO4. A modification of this colorimetric procedure is described that permits use of phosphoric acid containing these impurities and allows accurate and precise determination of urea in soil extracts.

引用

页码：1163 / 1170

页数：8