液状アマルガムを使用する重油,燈油中の硫黄化合物の還元定量
非水溶媒中のアマルガム法(第3報)
1978 年 27 巻 6 号 p. 371-373
詳細
1978 年 27 巻 6 号 p. 371-373
Liquid amalgam method to determine sulfur compounds in fuel oil and kerosene was investigated in dimethylformamide (DMF) as solvent. Sample solution was prepared by dissolving fuel oil or kerosene in a DMF-benzene (3:1) mixed solvent. A DMF-hydrogen chloride adduct prepared by a direct reaction of DMF and gaseous hydrogen chloride was added to the sample solution, and the mixture was stirred together with liquid lead amalgam. Reduction reaction was supposed as follows: The formation of PbCl2 was accompanied with the generation of the equivalent amount of H2S and the PbCl2 was soluble in DMF as an addition compound. The PbCl2 in the sample solution was then titrated with EDTA conductimetrically and sulfur in oils could be determined indirectly. About (1015) min of stirring was enough to complete reduction. The analytical results of this method were lower than those of the Bomb method, because of the presence of sulfate and sulfoxide which can not be reduced by amalgam method.
