Solute inverse retentions, function

Equation 41 thereby provides the means of representing solute inverse retentions as a function of the concentration of mobile-phase additive irrespective of the valency of eitheri For example, in those instances where y X, the relation reduces to ... 

Two types of retention data, i.e., (i) retention volumes measured at an infinite dilution of the solute as a function of temperature, and (ii) retention data recorded at different solute s concentrations and a constant temperature, can be used to characterize surface heterogeneity of porous solids in terms of the distribution function F (K). This function, which is the result of inversion of the integral equation (18), can be easily converted to the adsorption energy distribution. 

Analytical information taken from a chromatogram has almost exclusively involved either retention data (retention times, capacity factors, etc.) for peak identification or peak heights and peak areas for quantitative assessment. The width of the peak has been rarely used for analytical purposes, except occasionally to obtain approximate values for peak areas. Nevertheless, as seen from the Rate Theory, the peak width is inversely proportional to the solute diffusivity which, in turn, is a function of the solute molecular weight. It follows that for high molecular weight materials, particularly those that cannot be volatalized in the ionization source of a mass spectrometer, peak width measurement offers an approximate source of molecular weight data for very intractable solutes. 

The dimensionless mean retention time, Hi/to is independent of the carrier gas velocity and is only a function of the thermodynamic properties of the polymer-solute system. The dimensionless variance, i2 /tc2. is a function of the thermodynamic and transport properties of the system. The first term of Equation 30 represents the contribution of the slow stationary phase diffusion to peak dispersion. The second term represents the contribution of axial molecular diffusion in the gas phase. At high carrier gas velocities, the dimensionless second moment is a linear function of velocity with the slope inversely proportional to the diffusion coefficient. 

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