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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?

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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/dM

The question was posed to me in a job interview.

Query is from Column Efficiency and Column Resolution in division Chromatography of Analytical Instrumentation

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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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