Abstract
As the use of the spectrograph for the detection and determination of the metallic elements in all kinds of materials increased, there arose a demand for extremely pure metals, oxides and salts to serve as standards. About 1922 Dr. S. Judd Lewis suggested to Messrs. Adam Hilger, Ltd., that they should supply for this purpose spectroscopically standardized substances; the proposal was adopted, all arrangements for the supply of the substances and their analysis being in the hands of Dr. Judd Lewis. These pure substances have become well known under the trade mark of "H. S." Substances, and now include most of the more common and many of the rarer metals, as well as most of the rare earth oxides. In 1932, when Dr. Judd Lewis proposed the 'ratio quantitative' method of spectrographic analysis, the 'Specpure' series of 'ratio powders', 'ratio solutions' and pure salts was introduced, and now comprises more than fifty substances which are available in a spectro-graphically standardized condition. Every supply of "H. S." or "Specpure" material has always been accompanied by a full report of the results of chemical and spectrographic examinations made on that material. So far as possible, an estimate is given of the amounts of each trace element present, and reference is made to all the spectrum lines due to the impurities which have been detected.
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Spectroscopically Standardized Substances. Nature 155, 784 (1945). https://doi.org/10.1038/155784b0
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DOI: https://doi.org/10.1038/155784b0
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