A modified diacetyl monoxime method for colorimetric determination of urea in soil extracts1
- 1 January 1979
- journal article
- research article
- Published by Taylor & Francis in Communications in Soil Science and Plant Analysis
- Vol. 10 (8), 1163-1170
- https://doi.org/10.1080/00103627909366969
Abstract
Some batches of phosphoric acid 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 phosphoric and sulfuric acid. 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.Keywords
This publication has 1 reference indexed in Scilit:
- Extraction and Colorimetric Determination of Urea in SoilsSoil Science Society of America Journal, 1970