# Integration function in OpenLab 2.7

Dear Community,

when using the integration function area reject in OpenLab 2.7 the peak area of rider peak is summarized with the main peak, if the peak area of the rider peak is below the minimum area. We already tried the following integration functions: exponential skim and straight skim without success as peak areas are summarized, if a minimum area for area reject is set. Using peak separation by Valley-to-Valley or perpendicular drop line integration are no suitable solutions either.

We are currently searching for an integration function, which integrates the peak area of main peak and rider peak correctly, but excludes the rider peak from the calculation if its peak area is below the minimum area. Does OpenLab 2.7 provide such a function?

• Hello,

I assume when you say rider peak you are talking about a skimmed peak. What calculation are you trying to exclude the skimmed peak from when below the area threshold? My suggestion would be to use CC or IR to do the calculation using peak area as the filter in the calculation or table.

Marty

• Hello Marty,

does this mean that there is no other integration function in OpenLab 2.7 available, that keeps the integration resulting from exponential skim or straight skim, even though a minimum area is set without merging the peak areas?

If I say rider peak I mean the definition of rider peak in the explanation of area reject in the OpenLab Help & Learning: OpenLab Help & Learning (agilent.com)

The rider peak should be excluded from the conentration calculation, if it is below the minimum area.

• Hello,

No if the skimmed peak does not meet the minimum area reject the parent peak retains the entire area. If you need the parent peak area with skimmed peak area subtracted, I would allow the peak to be skimmed by setting the reject low enough and then in CC or IR setup an area reject to set any peaks below your reject value to 0 or ND.

Marty