Letter | Published:

Divalent Manganese in Soil Extracts

Nature volume 158, pages 791792 (30 November 1946) | Download Citation



Dion and Mann1 extracted trivalent manganese from soil with neutral solutions of sodium pyrophosphate. Such soil extracts gave a strong blue coloration with benzidine which was due to the trivalent manganese present. Later it was found that solutions of potassium pyrophosphate of pH 9.4 extracted significant amounts of manganese from soils. As the alkaline extracts gave no benzidine test, it seemed possible that the manganese present was in the divalent form. A number of soils representing different soil types were therefore extracted with M/5 pyrophosphate solutions at pH 7.0 and 9.4. Typical results are set out in Table 1, which also gives the exchangeable manganese determined by extracting the soils with N calcium nitrate, and the nitrogen content.

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  1. 1.

    , and , J. Agric. Sci., 36, 239 (1946).

  2. 2.

    , and , J. Agric. Sci., in the press.

  3. 3.

    , and , Indust. Eng. Chem. Anal. Ed., 18, 191 (1946).

  4. 4.

    , , , and , see preceding communication.

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  1. Chemistry and Biochemistry Departments, Rothamsted Experimental Station, Harpenden, Herts. Nov. 1.

    • S. G. HEINTZE
    •  & P. J. G. MANN


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