Conductance of a sample peak

The general equation for detector response in ion chromatography was derived in Chapter 5. The following is a more specific derivation that takes into account that the eluent and sample are not always completely ionized. 

Equation 6.1 can be used to calculate the change in conductance when a sample anion is present. Let Ce be the concentration of the eluent anion, and Cs be the concentration of sample anion. 

Taking all forms of eluent and sample into account  

The background conductance (taken from Eq. 6.1), where there is no sample pres- 

The concentration of E during a sample peak elution will be (Ce - Cs)Ie- The concentration of S during a sample peak elution is Csls. The conductance of the eluent and sample during a peak elution, Gs, is described with Eq. 6.9. The conductance is the sum of the contributions from the eluent ions and the sample ions. 

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The change in conductance of a sample peak is greater with suppressed conductivity than with nonsuppressed detection. This is largely the result of the very high equivalent conductance of H which is present in exactly the same concentration as the analyte anion. The baseline conductivity is also lower with sup-... 

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