Which of the following is the expression for longitudinal diffusion in the column, if ‘γ’ represents obstruction factor, ‘dM’ represents particle diameter, ‘DM’ represents Solute diffusion co-efficient and ‘λ’ represents function for packing uniformity?(a) λ dM(b) 2 γ DM(c) DM γ(d) λ/dMThe question was posed to me in a job interview.Query is from Column Efficiency and Column Resolution in division Chromatography of Analytical Instrumentation

Which of the following is the expression for longitudinal diffusion in

1.	Which of the following is the expression for longitudinal diffusion in the column, if ‘γ’ represents obstruction factor, ‘dM’ represents particle diameter, ‘DM’ represents Solute diffusion co-efficient and ‘λ’ represents function for packing uniformity?(a) λ dM(b) 2 γ DM(c) DM γ(d) λ/dMThe question was posed to me in a job interview.Query is from Column Efficiency and Column Resolution in division Chromatography of Analytical Instrumentation
Answer» The CORRECT choice is (b) 2 γ DM Explanation: LONGITUDINAL diffusion is given as, B = 2 γ DM.It is ALSO called axial diffusion.

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