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- W1519384574 abstract "Retention was measured as a function of the amount of solute injected in packed column supercritical fluid chromatography with three different chemically bonded stationary phases and with carbon dioxide as the mobile phase. The retention was found to decrease with increasing sample size. The effect was more pronouonced for polar solutes. A mixed retention mechanism is postulated to explain the results. Both the chemically bonded groups on the surface and the residual silanol groups are assumed to contribute to the retention. The former type of interaction is assumed to be independent of the solute concentration (i.e., a constant distribution coefficient). The adsorption on silanol groups is described by a Langmuir isotherm. By assuming that the observed capacity factor is proportional to the distribution coefficient, an equation can be fitted to the experimental data. The resulting coefficients can be used to characterize the extent to which residual silanols contribute to the retention process. When methanol is added as a modifier to the mobile phase, the effect of sample size on retention disappears, suggesting that preferential adsorption of modifier deactivates the silanol groups on the surface." @default.
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- W1519384574 date "1988-01-01" @default.
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- W1519384574 title "Effect of sample size of retention in packed column super-critical fluid chromatography" @default.
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- W1519384574 doi "https://doi.org/10.1016/s0021-9673(01)82028-8" @default.
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