A COMPARISON OF THE DIRECT AND INDIRECT RADIOACTIVE METHODS FOR DETERMINING THE SURFACE AREA OF A STRONTIUM SULPHATE PRECIPITATE

1 April 1949

journal article
Published by Canadian Science Publishing in Canadian Journal of Research

Vol. 27 (4) , 238-257
https://doi.org/10.1139/cjr49b-027

Abstract

The specific surface of a strontium sulphate precipitate, as determined by the direct radioactive method using Sr⁹⁰, was found to be 12,800 sq. cm. per gm. The specific surface of the same strontium sulphate precipitate was also determined by the indirect method using ThB. Specific surfaces of 30,800 and 21,300 sq.cm. per gm. were obtained using ThB separated, from thorium nitrate, by the chemical separation and emanation methods, respectively. The factor of approximately 2 between the direct and indirect methods indicates that Paneth's theories, while probably correct in the main, may require some modification.

Keywords

STRONTIUM/DETERMINATION

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