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On the measurement of hydrogen-ion concentrations in soil by means of the quinhydrone electrode

Published online by Cambridge University Press:  27 March 2009

Einar Biilmann
Einar Biilmann
Affiliation:
Director of the Chemical Laboratory of the University, Copenhagen.
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Extract

The measurement of the hydrogen-ion concentration of soils often presents great difficulties. When ordinary hydrogen electrodes are used, constant potentials are, in many cases, only obtained after hydrogen has been passed for several hours, while in many instances hydrogen electrodes cannot be used at all. The other important method of determining “pH,” the colorimetric method, can only be used in testing clear and almost colourless soil extracts, but not in testing soil mixtures.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 14 , Issue 2 , April 1924 , pp. 232 - 239
Copyright
Copyright © Cambridge University Press 1924

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References

page 232 note 1 Københavns Universitets Festskrift, 1920. Annales de Chimie, 9. serie, 15, 109 (1921).Google ScholarBiilmann, and Lund, , ib. 18, 321 (1921).Google Scholar

page 233 note 1 In earlier investigations I have only used the quinhydrone electrode in acid solutions, but during the present work it was found that the electrode may also be used in the weakly alkaline mixtures of soil and water. Recently Kolthoff (Rec. Trav. Chim. Pays Bas, 42, 186, 1923)Google Scholar has used the electrode at pH 8.

page 233 note 2 Journ. Chem. Soc. 123, 2203, 1923.Google Scholar

page 237 note 1 Samples 1–7 are the same as those of which the pH values are given in Table III. We find that the extracts show on an average a lower value for pH than the corresponding mixture of soil and water.