Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-25T05:18:56.121Z Has data issue: false hasContentIssue false

On the estimation of nitrates in soils by the phenol disulphonic acid method

Published online by Cambridge University Press:  27 March 2009

C. T. Gimingham
Affiliation:
Research Department, Olympia Agricultural Company, Ltd.
R. H. Carter
Affiliation:
Research Department, Olympia Agricultural Company, Ltd.

Extract

So many papers on the use of the phenol disulphonic acid method for estimating nitrates in soils have been published in this country and in America in the last few years, that some apology seems needed for adding yet another note to the literature of the subject. The method possesses great advantages as regards rapidity and convenience over the methods involving distillation and yet in the writers' experience, in spite of the numerous studies already made, it has failed to give entirely satisfactory results; in particular when small quantities of nitrate have to be estimated in soils containing much organic matter, the strong sulphuric acid in the reagent chars the organic matter and makes it exceedingly difficult to match exactly the tints from the soil extracts with those given by the standard nitrate solutions.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1923

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

page 60 note 1 Soil Science, 12, No. 5, p. 413.Google Scholar

page 62 note 1 Emerson recommends a “coarse” filter paper but does not draw special attention to this point.