Emission Spectroscopy without Emulsion Calibration Curve. The Spectro-nomograph Chart

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Abstract
The spectrographs properties of the sample and the characteristics of the photographic emulsion can be taken into account simultaneously through a parameter, α, representing the slope of the analytical curve This paper describes an analytical procedure (the parametric method) that introduces into the calculation α of the function instead of γ of the photographic emulsion. This substitution of parameters leads to automation of the spectrochermcal calculations The unknown concentration of an element can be calculated with a standard formula, free of γ, by making use of a digital computer or by plotting analytical curves on the “Spectro-nomograph” chart directly from transmissions. In both cases this technique eliminates the determination of the intensity ratios. The principles of the method and the mathematical derivation of the chart are given.

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