CF Impurity % in a Sample

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in Software Products
Please,

Being very novice in Empower usage, a step-by step response will be please very helpful and very much appreciated.

I am creating a Custom Field to calculate the Impurity C % of a compound in the injection of a Sample, by means of the following formula:


The Sample Set of the sequence is the following:

The CF I created is the following (see line 6):

The processing method is:


However, my CF didn't work: in particular, when I open the sequence in Review (without processing) I only obtain empty cells. Unfortunately, I was not able to find mistakes.

Thanks in advace for any help,

Kind regards,
Fabio

Comments

  • Jovvor
    Jovvor
    edited May 6

    Dear Fabio,

    The reason your custom field does not work is probably because you use intersample custom field references. D…(Value) or D..(CCompRef1[Area]

    That will only work if you process the sample set in a whole to obtain a result set with the summarize custom field row at the end of your sequence.

    As the calculation is a pretty straight forward calculation I think what you should do is the following.

    1. Remove in your Component Editor the 1.0000 from all your unknowns and standards. Only use the actual values. Leave the rest blank.
    2. I interpretate your sampleweight 10.1380 and dilution 5000 to be the actual sample weight and the times it is diluted. Leave it as it is.
    3. Create a custom field calculation Amount/CConst1*100
    4. If you look in review now, it should work if you first calibrate your standards and integrate your samples afterwards.

    A calibration curve for your impurity C will be drawn up and the amount will be calculated against it.

    Amount is calculated with the default fields and you could interpretate it as Area(sample)/Area(ref)*Value(ref)*Purity(ref %)/Sampleweight(Sample)*Dilution(sample)

    So you can start from Amount and incorporate the formula further from that.

    Off course there are a lot of different ways to go with this but in my opinion, this is a pretty easy approach to it.


  • Spin
    Spin
    Dear Jovvor,

    I modified the CFs as you reported. I have added the summarize custom field row at the end of sequence. Now it all makes sense!

    thank you so much,
    Fabio

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