Van deemter equation - PowerPoint PPT Presentation

Lecture 8

Lecture 8. Van Deemter Equation!. (. ). k’. 1. 1+k’. 4. efficiency. selectivity. retention. Resolution. Describes how well 2 compounds are separated. Rs = . N 1/2 (  -1). t R -t M. 1 &lt; k’ &lt; 10. k’ = . t M. (. ). k’. 1. 1+k’. 4. Resolution.

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Alternative Approach: Rate Theory Based on the principal of the summation of variances.

Alternative Approach: Rate Theory Based on the principal of the summation of variances. σ T 2 = σ 1 2 + σ 2 2 + σ 3 2 + … So all contributions to the broadening of a peak can be combined in this way. σ T 2 = σ 1 2 + σ 2 2 + σ 3 2 + …

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