重油中の微量イオウの吸光光度定量法

概要

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A simple spectrophotometric method for the determination of a small amount of sulfur in heavy oil has been proposed. <BR>An amount of heavy oil is diluted with toluene, and 10 μ<I>l</I> of the diluted solution is transfered through a microsyringe onto a filter paper strip on a platinum wire. The paper is burned in an oxygen flask, and sulfur dioxide formed is absorbed in a definite amount of an aqueous solution of mercuric nitrate and potassium bromide. An aliquot of this solution is transfered into a brown separatory funnel, and is shaken with a buffer solution (pH 7), benzene and an ethanol solution of diphenyl-carbazone. Sulfur in heavy oil can be thus determined with satisfactory results by measuring the absorbancy of the benzene phase at 562 mμ, refereing to the calibration curve prepared beforehand.
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