Kiselev-Yashin equation

Methods for determining sorption isotherms by gas chromatography have been published by various authorsQ,-, ). The methods used have been elution and frontal chromatography. The first combines sorption and desorption so that any hysteresis in the equilibrium transport from gas to stationary phase and back to the gas phase can produce corresponding errors. The Kiselev-Yashin equation, as shown in Figure 1,... 

When three dimensional particles were used instead of coatings, the diffusional and structural kinetics showed marked differences in the rates of mass to area in the concentration dependent regions of partition coefficient (lower temperature and mass sorbed). Thus, the fundamental assumption of the Kiselev Yashin equation that the mass/area ratio was equal for prepeak and peak regions was not met, and agreement with static data was fortuitous at best. 

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