A colorimetric method for the determination of potassium and its application to the analysis of soil extracts

C. L. Whittles*, R. C. Little

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A colorimetric procedure is described for the determination of small amounts of potassium. The soil is extracted with Bray's extracting reagent and the available potassium is precipitated as cobaltinitrite. The determination of potassium precipitated involves the diazotization of sulphanilic acid, using the nitrite groups, of the cobaltinitrite precipitate, and subsequent coupling with dimethylaniline to give methyl orange. The colour is measured with a Spekker absorptiometer. The method is applicable to the routine determination of potassium in soil extracts.

Original languageEnglish
Pages (from-to)323-326
Number of pages4
JournalJournal of the Science of Food and Agriculture
Volume1
Issue number11
DOIs
Publication statusPrint publication - Nov 1950

Fingerprint Dive into the research topics of 'A colorimetric method for the determination of potassium and its application to the analysis of soil extracts'. Together they form a unique fingerprint.

  • Cite this