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E the retention time tr for an analyte is the time

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Unformatted text preview: retention time (tR) for an analyte is the time between its injection onto a column and the appearance of its peak as it elutes from the column. f) The retention factor (k) is the ratio of the amount of analyte in the stationary phase to the amount in the mobile phase. It is generally calculated by k’ = (tR - tM)/tM = tR’/tM. g) The selectivity factor (α) of a column for two analytes (A eluting before B) is given by α = KB/KA = k’(B)/k’(A) = tR’(B)/tR’(A). h) The plate height (H) of a chromatographic column is defined by the relationship H = σ2/L, where σ is the standard deviation of the concentration distribution for the analyte in its elution band (in units of length) and L is the length of the colum...
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This document was uploaded on 03/06/2014 for the course CHEM 422 at CSU Northridge.

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