Determination of sulfur forms in natural fuel materials by atomic absorption spectrometry of barium

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Forms of sulfur are converted seriatim to barium sulfate which is metathesized to barium carbonate, dissolved, and quantified by atomic absorption spectrometry. Sulfate is extracted with perchloric acid. Pyritic sulfur is converted by lithium aluminum hydride to hydrogen sulfide which is oxidized with alkaline hydrogen peroxide. Organic sulfur is completely oxidized by using the "liquid fire" reaction. Application of these methods to synthetic samples carefully treated to insure homogeneity resulted in average relative standard deviations of 3.0, 2.7, and 3.2% for suffate, pyrite, and organic sulfur, respectively. Average absolute errors were less than 0.04% S for the determination of each sulfur form. © 1983.

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Analytica Chimica Acta