Characterization of ethylene oxide/tert-octylphenol condensates by ultraviolet and infrared spectrometry

✍ Scribed by Juan Luis Carrion; Salvador Sagrado; Miguel de la Guardia

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 491 KB
• Volume: 185
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(86)80037-x

✦ Synopsis

The average degree of condensation of ethylene oxidejtert-octylphenol condensate surfactants can be estimated rapidly by U.V. and i.r. spectrometry. The U.V. method is based on evaluating the specific absorptivity, a, at 275 nm in aqueous ethanol (60:40 v/v), and inserting this value in equations obtained from previously characterized samples, relating a to the average properties to be determined. Infrared spectrometry is applied similarly; the average properties to be determined are related to the ratio between the band heights at 960 and 840 cm-'. The relative standard deviations (n = 10) obtained for a sample of Triton X-100 were 2% by U.V. spectrometry, and 3% by i.r. spectrometry. The accuracy was similar to that obtained by n.m.r.