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- W2016294358 abstract "This work compares capillary supercritical fluid chromatography (SFC) and capillary high‐temperature gas chromatography (HTGC) for the quantitative characterization of nonionic alcohol ethoxylate surfactants. Supercritical fluid chromatographic separations of the alcohol ethoxylates were obtained with a density‐programmed carbon dioxide mobile phase and a fused silica capillary column. High‐temperature gas chromatographic separations were obtained with a high‐temperature polyimide‐coated fused silica capillary column. In addition, a procedure was developed for the quantitation of the capillary chromatographic data using flame ionization molar response factors based on the effective carbon theory. The alcohol and ethoxylate distributions, mean molecular weights and average moles of the ethylene oxide are rapidly calculated from the chromatographic data. Advantages and limitations of SFC and HTGC procedures are illustrated and discussed. Based on this work, the following conclusions can be drawn: i) For routine quality control analyses of known alcohol ethoxylates, SFC and HTGC appear to be equally applicable. ii) SFC has the advantage of time because derivatization is not required, although derivatization does improve resolution. iii) HTGC has the advantage of resolving C 12 through C 18 alcohol ethoxylate oligomers, avoiding ambiguous identification of components. iv)SFC and HTGC both have disadvantages. SFC has a resolution limitation and HTGC discriminates against high molecular‐weight components." @default.
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- W2016294358 title "Comparison of high‐temperature gas chromatography and CO<sub>2</sub> supercritical fluid chromatography for the analysis of alcohol ethoxylates" @default.
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- W2016294358 doi "https://doi.org/10.1007/bf02635796" @default.
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