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On the perchlorate method for the estimation of potassium in soils, fertilisers, etc.

Published online by Cambridge University Press:  27 March 2009

H. J. Page
H. J. Page
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
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Extract

(1) It is shown that the presence of chloric acid in the perchloric acid used for the estimation of potassium in soils, fertilisers, and plant material, by Davis's method (l) gives rise to very erratic and erroneous results. Every sample of perchloric acid should, therefore, be tested for freedom from chloric acid before being used for the estimation of potassium.

(2) Results are quoted which indicate that in the application of Neubauer's method of treatment of the soil extract to a soil deficient in carbonates, it is sufficient to add only 0·1 gm. of calcium carbonate to the extract instead of the 0·5 gm. generally used. A considerable economy of perchloric acid is thereby effected.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 14 , Issue 1 , January 1924 , pp. 133 - 138
Copyright
Copyright © Cambridge University Press 1924

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References

REFERENCES

(1)Davis, W. A.The Estimation of Potassium, especially in fertilisers, soil extracts, and plant ashes. Journ. Agric. Sci. 5, 52, 1912.CrossRefGoogle Scholar
(2) List of Reagents for analytical purposes, with notes indicating the standards of purity regarded as necessary for analytical work, prepared by a special committee appointed by the Councils of the Institute of Chemistry and the Society of Public Analysts, etc. 1915.Google Scholar
(3)Hall, A. D.Analyst, 11, 1900.Google Scholar
(4) Ministry of Agriculture, Leaflet No. 18. Revised, 07, 1918.Google Scholar
(5)Neubauer, H.Landw. Vers.-St. 63, 141, 1905.Google Scholar