標準號：ISO 2272-1989
中文標準名稱：表面活性劑 肥皂 用分子吸收光譜法測定低含量游離甘油
英文標準名稱：Surface active agents; soaps; determination of low contents of free glycerol by molecular absorption spectrometry
標準類型：Y40;Y43
發布日期：1999/12/31 12:00:00
實施日期：1989/7/15 12:00:00
中國標準分類號：Y40;Y43
國際標準分類號：71.100.40
適用范圍：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.