Hostname: page-component-77c89778f8-9q27g Total loading time: 0 Render date: 2024-07-20T13:54:24.574Z Has data issue: false hasContentIssue false
  • English
  • Français

The Colorimetric Determination of Phosphoric Acid in Hydrochloric Acid and Citric Acid Extracts of Soils

Published online by Cambridge University Press:  27 March 2009

R. G. Warren  and
A. J. Pugh
R. G. Warren
Affiliation:
(Chemistry Department, Rothamsted Experimental Station, Harpenden.)
A. J. Pugh
Affiliation:
(Chemistry Department, Rothamsted Experimental Station, Harpenden.)
Get access Rights & Permissions [Opens in a new window]

Extract

1. The colorimetric determination of phosphoric acid in hydrochloric and citric acid extracts of soils by a method involving the evaporation of the extract, ignition and acid extraction of the residuewith either the Denigès and Fiske-Subbarow methods of colour development was satisfactory only with light soils. Clay soils gave low results owing to the presence of larger amounts of iron.

2. A method is given in which the organic matter and iron are removed by treatment with sodium permanganate and potassium ferrocyanide. The results are in good agreement with the gravimetric method.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 20 , Issue 4 , October 1930 , pp. 532 - 540
Copyright
Copyright © Cambridge University Press 1930

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

REFERENCE

(1)Lonstein, I.S. African J. Sci. (1926), 23, 188–95.Google Scholar
(2)Denigès, G.Compt. rend. (1920), 171, 802–4.Google Scholar
(3)Fiske, C. H. and Subbarow, Y.J. Biol. Chem. (1925), 66, 375–400.Google Scholar
(4)Matther, T. H.Sci. Agric. (1925), 10, 35.Google Scholar
(5)Denigæs, G.Compt. rend. (1928), 186, 1052.Google Scholar
(6)Belgrave, W. N. C. Malayan Agric. J. (1928), 18, No. 11, 361.Google Scholar
(7)Parker, F. W. and Fudge, J. F.Soil Sci. (1927), 24, 2.Google Scholar