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Which of the following is the expression for Eddy diffusion in the column, if ‘γ’ represents obstruction factor, ‘dp’ 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 Eddy diffusion in the column, if ‘γ’ represents obstruction factor, ‘dp’ 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

This question was addressed to me in an interview for internship.

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

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Right option is (a) λ dM

For explanation I would say: Eddy diffusion is given as, A = λ dp. It is also called multipath term.

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