Modeling of gas sample behavior in gas chromatography column
  The equilibrium-dispersive model of the linear GC (gas chromatography) was derived using both assumptions and the method of its derivation different from the known in literature. It was concluded that this model is a specific case of the Fokker-Planck equation for diffusion with drift. The resolution of this derived equation for assumed initial conditions is the normal distribution with movable mean value. At the end of the GC column the standard deviation of this distribution was investigated as a factor of the sample shape. This standard deviation is independent of the retention factor. 
Zenon Gniazdowski, Pawel Kowalski
cond-mat.stat-mech