ISO 2272:1989 表面活性剂.肥皂.用分子吸收光谱测定法对低浓度游离甘油的测定

标准编号：ISO 2272:1989

中文名称：表面活性剂.肥皂.用分子吸收光谱测定法对低浓度游离甘油的测定

英文名称：Surface active agents — Soaps — Determination of low contents of free glycerol by molecular absorption spectrometry

发布日期：1989-07

标准范围

测定方法如下:用硫酸分解肥皂，用轻质石油萃取脂肪酸。高碘酸将残留在水相中的游离甘油氧化成甲酸和甲醛。与变色酸反应时，形成的醛会产生一种吸收化合物，其吸光度与游离甘油含量成正比。光谱法测量波长约571毫米处的吸光度。

The determination is carried out in the following way: Decomposition of the soap by sulfuric acid and extraction of the fatty acida with light petroleum. Oxidation of the free glycerol remaining in the aqueous phase by periodic acid to formic acid and formaldehyde. On reaction with chromotropic acid, the aldehyde formed gives an absorbing compound whose absorbance is propotional to the free glycerol content. Spectrometric measurement of the absorbance at a wavelength about 571 mm.

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