Letter | Published:

Sedimentation Equilibrium Measurements with Low Molecular Substances in the Ultra-Centrifuge

Nature volume 135, pages 304305 (23 February 1935) | Download Citation

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Abstract

IN a recent paper1 I have shown that it is possible to study the sedimentation equilibrium of the heavier inorganic salts (for example, CsCl, Csl, KIO3, LiIO3, HgCl2 and others in 0.1 molar solutions) in the ultra-centrifuge of The Svedberg2. These experiments were carried out in a centrifugal field of about 200,000 times gravity. By means of a refractometric method worked out by O. Lamm3 it was possible to study the change in concentration in the cell. From the variation of the concentration set up by these intense centrifugal fields with the distance from the axis of rotation, the molecular weight of the substance may be calculated when the speed of the centrifuge and the temperature of the cell are known. In addition, it is necessary to know the density of the solution and the partial specific volume and activity coefficient of the substance in solutions of like concentrations.

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References

  1. 1.

    , Z. phys. Chem., A, 170, 41; 1934.

  2. 2.

    The , and , NATURE, 134, 98; 1934.

  3. 3.

    , Z. phys. Chem., A, 138, 313; 1928. 143, 177; 1929.

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Affiliations

  1. Laboratory of Physical Chemistry, University of Uppsala, Uppsala, Sweden. Dec. 22.

    • KAI O. PEDERSEN

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DOI

https://doi.org/10.1038/135304a0

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