有機イオウの吸光光度法によるデシミリグラム微量定量

町田 弥, 奥谷 忠雄, 内海 喩

doi:10.2116/bunsekikagaku.17.436

有機イオウの吸光光度法によるデシミリグラム微量定量

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町田弥

日本大学理工学部
奥谷忠雄

日本大学理工学部
内海喩

日本大学理工学部

書誌事項

タイトル別名

Decimilligram determination of organic sulfur with spectrophotometric method
ユウキイオウノキュウコウコウドホウニヨルデシミリグラムビリョウテイリョウ
Organic micro elemental analysis by colorimetric method. II
比色法による有機微量元素分析 (第2報)

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説明

A new spectrophotometric method for the determination of sulfur in decimilligram amounts of organic compounds has been proposed, which is simple and gives satisfactory results.<BR>A sample is burned in a flask filled with oxygen, and the sulfur dioxide formed is absorbed in a definite amount of aqueous solution of mercuric nitrate mixed with potassium bromide. An aliquot of the absorption solution is transfered into a brown separatory funnel, and is shaken with a buffer solution (pH 7), benzene and an ethanol solution of diphenylcarbazone. By this procedure, sulfite in the solution reacts with the mercuric reagent, and the excess of the latter forms the reddish-violet complex with diphenylcarbazone which is extracted into benzene. Sulfur in organic compounds can be thus determined by measuring the absorbancy of the benzene phase at the wavelength of 562 mμ, referring to the calibration curve prepared beforehand.