Example 7: Compute column performance control RRF (EN14405)

The column performance is computed as the ratio of RF (Area/Amount) of two compounds that are internal standards (Di-C38 and Tri-C57).

• Scope: Signal

• Type: Double

• Use the ByName function on the signal to find DI-C38, Tri-C57 etc.

• Search Area and Amount fields on Peak or group.

Formula

Create intermediate CCs:

ADiC38 = CurrentSignal.PeakOrGroupByName("Di-C38").Compound_Area

MDiC38 = CurrentSignal.PeakOrGroupByName("Di-C38").Compound_Amount

ATriC57 = CurrentSignal.PeakOrGroupByName("Tri-C57").Compound_Area

MTriC57 = CurrentSignal.PeakOrGroupByName("Tri-C57").Compound_Amount

Create Formula for RRF:

RRF = (ADiC38/MDiC38)/(ATriC57/MTriC57)

NOTE

Compound names must be identical in the Data Analysis processing method and in the Custom Calculation formulas.