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- W2040378910 abstract "The determination of surfactants in surface waters is required owing to their toxicity to aquatic micro-organisms and potential as endocrine disrupters. We have previously reported a method for the simultaneous separation of linear alkyl benzene sulfonates (LAS) and nonylphenol ethoxylates (NPEO) by high-performance liquid chromatography using a C1 (TMS) column. In this earlier work we discussed some problems with the resolution of individual ethoxymers from NPEO using C1 columns from different manufacturers. Here, we postulate that this phenomenon may be linked to carbon coverage of the C1 (TMS) stationary phases and study this utilising both elemental (bulk) analyses and surface specific analyses by X-ray photoelectron spectroscopy. Data obtained indicate that for the simultaneous separation of the LAS homologues and ethoxymers of NPEO, the stationary phase must have some trimethylsilyl groups bound to the surface of the silica in order to achieve separation of the LAS homologues, however the degree of surface coverage must not be greater than ca. 0.5 micromol/m2 in order to achieve adequate resolution of the NPEO ethoxymers. These data support earlier evidence for a pseudo reversed-phase mechanism for this separation." @default.
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- W2040378910 date "2000-12-01" @default.
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- W2040378910 title "Influence of surface carbon coverage of C1 (TMS) stationary phases on the separation of nonylphenol ethoxylate ethoxymers" @default.
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- W2040378910 doi "https://doi.org/10.1016/s0021-9673(00)00878-5" @default.
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