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5435557 
Journal Article 
Sorption of linear alcohol ethoxylate surfactant homologs to soils 
Yuan, C; Jafvert, CT 
1997 
1 
Journal of Contaminant Hydrology
ISSN: 0169-7722
EISSN: 1873-6009 
Elsevier Science B.V. 
28 
4 
311-325 
English 
WOS:000071511100003 
Sorption onto five saturated soils of the homologs within the commercial surfactant mixture Brij 35 (registered trademark of ICI Americas) was investigated. Brij 35 is a mixture of linear ethoxylated alcohols, having an average of 23 ethoxy (EO) groups per molecule and alcohol chain of primarily 12 carbons in length (C12H25(OCH2CH2)23OH). In experiments, saturated soils were exposed to various concentrations of the surfactant mixture for specified times, the slurries were centrifuged to separate the phases, the aqueous phases were extracted with 1,2-dichloroethane, and the residual homologs were derivatized with 3,5-dinitrobenzoyl chloride and analyzed by normal phase HPLC. Homologs containing 4–43 EO groups were chromatographically separated at near baseline. At aqueous Brij 35 concentrations below the critical micelle concentration (cmc), the proportion of each homolog sorbed to each of the soils increased with increasing EO chain length through the homologous series. As a result, in experiments where a significant proportion of the surfactant adsorbed, significant shifts in the aqueous phase compositions occurred to mixtures with lower mean EO numbers. A sharp break in the adsorption isotherms occurs at the cmc. 
Brij 35; Pollution Abstracts; Water Resources Abstracts; Experimental data; Liquid chromatography; Surfactants; Alcohols; Sorption; Adsorption; Isotherms; Slurries; Soil contamination; SW 3020:Sources and fate of pollution; P 5000:LAND POLLUTION 
Chin, Y. P.