SST Difference

Tanmaypatel4
Tanmaypatel4
in Software Products
I'm attempting to create a CF for SST Difference from Initial Area(when prepared a SST) during HPLC runs, the calculation (as outlined in our SOP's) is as follows:       
I entered initial area in cConstant7 field

% Difference =[ A-B /A ] x 100
Where:                       
 A:    Area response of SST entered in cConstant7 field
 B:    Area response of SST standard (1 Injection Lable D0101)

Is this field possible to create ?

Comments

  • Empower2019
    Empower2019
    Instead of using CConst7 and to be more accurate, can you label the sample where you get the Initial Area from, for example Ref, and then make a peak, real CF result set only search order, formula:

    ((Ref.%.(Area)-D0101.1.(Area)/Ref.%.(Area))*100)*EQ(Label,"D010")+NEQ(Label,"D0101")*-1*50000

    Make sure Sample and Peak Type is set to All and that All or Nothing is ticked. Then when you process a sample set the result will be generated in the Result Set for the sample labelled D0101. 
  • Tanmaypatel4
    Tanmaypatel4
    We prepare and store the SST at 2°C to 8°C for a year. When required, we use it for analysis. Hence, after storage, the first analysis's standard area becomes the initial area, which is entered manually in the field. If the SST is outside 50% of the initial analysis area, we discard the solution.
  • Empower2019
    Empower2019
    Ok so the formula can then become:

    ((CConst7-D0101.1.(Area)/CConst7*100)*EQ(Label,"D010")+NEQ(Label,"D0101")*-1*50000

    or if you only have one active peak, set it in CCalRef1 of your processing method and the formula is:

    ((CCalRef1[CConst7]-D0101.1.(Area)/CCalRef1[CConst7])*100)*EQ(Label,"D010")+NEQ(Label,"D0101")*-1*50000

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