Calculation using internal standard
I want to calculate the amount with (single point-)calibration using an internal standard. However, the value in the "amount" field is not yet the actual amount, I think. The value should be multiplied by the weight of the internal standard to get a plausible result. If course, I have entered the weight of the internal standard as well as the weight of the reference standard using the button "Amount" during creation of the sample set.
Therefore I want to create a custom field which multiplies the "Amount" field with the weight of the internal standard. Unfortunately, I cannot find the weight of the internal standard for editing the formula in the custom field wizard.
Or did I something else wrong?
Thanks in advance!