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until reaction is complete. Ash overnight at 450 °C. in a muffle furnace. Dissolve the ash in 6 ml. of concentrated hydrochloric acid and sufficient water to give a final volume of 25 ml. Filter.Analytical Procedure. Make analyses in duplicate.Place a 3-ml. aliquot of sample or standard solution in each test tube, add 2 ml. of dipropvlene glycol reagent, and mix thoroughly, then, at once, add 5 ml. of barium chloride reagent and again mix thoroughly.Let mixture stand for 15 minutes to 1 hour and read transmittance at 720 µ, using reagent blank as reference sample. Determine concentration of sulfur from standard curve.If a smaller aliquot is used, enough zero sulfur standard should be added to make a volume with the aliquot of 3 ml.Reading the transmittance at about 410 mji increases sensitivity about twoor threefold. DiscussionComparison

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