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Spectrographic Determination of Halogens and Sulfur in Engine Deposits

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Abstract

Methods are described for the determination of Br, Cl, S, and Pb in lead-carbon matrices using ordinary spectrographic equipment. One to two milligrams of powdered sample diluted with an equal weight of pure zinc powder are pressed into the end of a pure silver pellet which is sparked against a pure silver counter-electrode. Corrections for background are necessary. By properly blowing helium through the analytical gap during the exposure, background corrections are eliminated and detectability is enhanced. Spectra are shown for comparison. Minimum detectability of the order of 0.05 percent is indicated for qualitative work. Analytical curves covering the concentration ranges 1 to 10 percent for chlorine and sulfur, 1 to 16 percent for bromine, and 25 to 50 percent for lead have been used to analyze engine deposits with an accuracy of ±15 percent of the amount present. Excitation conditions are given for two sources (one commercial) as used with two different spectrographs. Lines and line pairs used are listed.

© 1951 Optical Society of America

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