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  • 1
    Electronic Resource
    Electronic Resource
    Removal of trace organic compounds from multicomponent liquid mixtures. I. Adsorption of surfactant mixtures on activated carbon (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 1085-1089 
    Details
    ISSN: 1435-1536
    Keywords: Adsorption ; activated carbon ; surfactants ; sodium dodecyl sulfate ; polyoxyethylene hexadecyl ether
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This study shows how trace amounts of surfactants are adsorbed by activated carbon under competitive conditions in aqueous solution. Surfactants used as adsorbates are sodium dodecyl sulfate (SDS) and eicosaneoxyethylene hexadecyl ether (POE). Activated carbon used as an adsorbent is Pittsburgh activated carbon. Adsorption isotherms on the activated carbon were all Freundlich-type, both in the multi-solute system and in the mono-solute systems. The total adsorbed amount in the multi-solute system increases linearly with increasing molar fraction of SDS in the initial concentration. Thus, the total adsorbed amount in the multi-solute system can be estimated by the Freundlich constants, which can be determined from the single-solute equilibrium adsorptions, and molar fractions of adsorbates in the initial concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410327
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  • 2
    Electronic Resource
    Electronic Resource
    Estimation of the critical micelle concentrations and the aggregation numbers of sodium alkyl sulfates by capillary-type isotachophoresis (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 604-612 
    Details
    ISSN: 1435-1536
    Keywords: Criticalmicelle concentration ; aggregation number ; sodium alkyl sulfates ; isotachophoresis ; PU value
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The analytical procedure for the separation and quantification of bulk and micellar phases for sodium alkyl sulfates has been investigated by a capillary-type isotachophoresis using a potential gradient detector. Monomer solutions were distinguished from micellar solutions at pH 5.5–6.0; hydrochloric acid — L-Histidine mixture was used as the leading electrolyte and 2-(N-Morpholino) ethanesulfonic acid as the terminating electrolyte. The potential unit value (PU value) due to the monomer solutions was larger than that due to the micellar solutions. The zone length due to monomer solutions increased with increasing concentration of surfactant until a given concentration (CMC); beyond this point the values became constant. On the other hand, the zone length due to micellar solutions increased from this point. We report an applicability of capillary-type isotachophoresis to determination of the CMC's and aggregation number for various sodium alkyl sulfates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412776
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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