Determination of Small Amounts of an Element in a Powder without the AID of Standard Samples

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Abstract
A new method of calibration for estimating an element in a powder sample without synthetic standard samples is described. Allowance is made for the possible effect of the state of combination of the element on relative line intensities, which might interfere with extrapolation from simple addition standards. The method has been tried on a sample of graphite from nodular cast iron, to estimate the Mg content, and has led to the construction of a working curve for the estimation of Mg in graphite in the range 0.1 to 1%. Resume A new spectrochemical method is described for the determination of an unknown element in a powder sample without the aid of standard samples. The method described compensates for possible influence of the form of chemical combination on the relative intensities of the lines measured. The method has been applied to the determination of the Mg content of a graphite sample from a cast iron treated with Mg. The analytical curve for Mg in graphite allowing the determination of Mg from 0.05% to 1.0% can be set up by means of the results obtained.

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