Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942)

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Iodide Analysis in an Mq Developer

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A method is described for the analysis of iodide in a developer involving precipitation of the halide with silver nitrate and oxidation of the iodide while it is in the form of solid silver iodide to iodate with chlorine water. The iodate is then determined polarographically. Quantities of iodide from 2.5 to 10 milligrams of potassium iodide were analyzed with an accuracy of 2–4 per cent. Thiocyanate in the developer interferes but it can be removed by boiling with strong sulfuric acid before precipitation. Using this method of analysis it was shown that an equilibrium amount of iodide is obtained in a developer. Curves are given showing the attainment of equilibrium for development of Eastman panchromatic negative motion picture film, in Kodak D-76, and in Kodak D-16 developers, and Eastman positive motion picture film in Kodak D-16. The equilibrium value depends on the emulsion, the developer, the developed density, and perhaps other variables which will be investigated more thoroughly.
Publication Date: 1942-02-01
DOI: 10.5594/J09929
Link: https://doi.org/10.5594/J09929
Author(s): R. M. Evans, W. T. Hanson, P. K. Glasoe

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R. M. Evans, W. T. Hanson, and P. K. Glasoe; Iodide Analysis in an Mq Developer, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942. Available at https://doi.org/10.5594/J09929

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R. M. Evans, W. T. Hanson, and P. K. Glasoe; Iodide Analysis in an Mq Developer, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942. Available at https://doi.org/10.5594/J09929

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<span class="citation">R. M. Evans, W. T. Hanson, and P. K. Glasoe; <cite>Iodide Analysis in an Mq Developer</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942. Available at <a href="https://doi.org/10.5594/J09929" target="_blank" rel="noopener">https://doi.org/10.5594/J09929</a></span>

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<li>
R. M. Evans, W. T. Hanson, and P. K. Glasoe; <cite id="bib-10-5594-j09929">Iodide Analysis in an Mq Developer</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942
<span class="doi">10.5594/J09929</span>
</li>