AnsweredAssumed Answered

How to deduct blank peak area from sample (or standard) peak area

Question asked by peter.eros on May 14, 2019
Latest reply on May 16, 2019 by ir_nerd

Dear All!

 

A customer would like to do the following (I already advised them about blank subtraction but it is not what they want):

How to deduct blank peak area from sample (or standard) peak area

 

What the customer has already done:

 

CC1: to get the blank area(s)

cc_BlankArea

Average("Compound_Area", AllMatchingPeaksAndGroups(MatchOption.Compound,CurrentSequence.AllInjectionsOfType(SampleType.Blank)))

 

CC2: to deduct if there is a peak with a larger area in the sample (or standard) than in the blank):

cc_CorrByBlank

if(Compound_Area>=val(cc_BlankArea),Compound_Area-val(cc_BlankArea),0)

 

This works only if the peak is appearing (integrated) in the blank. If it is not then the CC "fails", does not calculate, there is nothing to deduct. Thats why they tried to use the "val" function unfortunatly with no success.

 

Do you have any ideas to handle this situation when there is no peak in the blank?

 

Thank you very much in advance,

Peter

 

 

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