A modified diacetyl monoxime method for colorimetric determination of urea in soil extracts

R. L. Mulvaney, J. M. Bremner

Research output: Contribution to journalArticle

Abstract

Some batches of phosphoric acid contain impurities that affect calorimetric 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.

Original languageEnglish (US)
Pages (from-to)1163-1170
Number of pages8
JournalCommunications in Soil Science and Plant Analysis
Volume10
Issue number8
DOIs
StatePublished - Jan 1 1979
Externally publishedYes

Keywords

  • diacetyl monoxime
  • soil extracts
  • urea

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

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