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• W2111020003 abstract "Octyl- and nonylphenol ethoxylates (OPEs and NPEs) with different numbers of ethoxy units (average values: n = 10 and N = 40 for OPEs, and n = 10 for NPEs) were separated by micellar electrokinetic chromatography under positive polarity using an 80 mM borate buffer of pH 8.5 containing sodium deoxycholate (SDC) or sodium cholate (SC). When sodium dodecyl sulfate (SDS) was added to the background electrolyte (BGE) in the absence of the bile salt, a single peak at a migration time longer than that of the EOF was obtained. Substituting the SDS by a bile salt, the homologues were resolved. At the same bile salt concentration, resolution between the homologues was higher with SDC than using SC. Optimum resolution between consecutive homologues was obtained with 50 mM SDC. In the presence of low or moderate amounts of acetonitrile or n-propanol, the background line improved significantly, whereas resolution may increase or decrease slightly. We propose a procedure for the determination of OPEs and NPEs with optimum resolution between the homologues as well as a modified procedure with improved selectivity for the single-run determination of other absorbing nonionic, cationic, and anionic (such as linear alkylbenzene sulfonates) surfactants in industrial and household cleaning products and its application to a variety of samples. The detection limit was ca. 28 μg·mL−1 of total NPE (n = 10), and peak area repeatabilities at 50 μg·mL−1 were 1.7% (intraday) and 5.6% (interday)." @default.
• W2111020003 created "2016-06-24" @default.
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• W2111020003 date "2001-02-01" @default.
• W2111020003 modified "2023-10-18" @default.
• W2111020003 title "Determination of alkylphenol ethoxylates by micellar electrokinetic chromatography with bile salts" @default.
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• W2111020003 doi "https://doi.org/10.1002/1522-2683(200102)22:3<526::aid-elps526>3.0.co;2-8" @default.
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