Calucation of Assay using Totalchrom custom expressions

[missmello]

I ama young scientist and a new Totalchrom user, and I am struggling with how to go about creating a custom expression to automatically calculate wt./wt.% assay. I understand how to add custom expressions in a report format. As of right now I am setting my reference standard calibration level to "1", and added in the amount of standard used. In my sequence my first reference standard is set to "cal-replace" and the next four are set to "cal-average". I have added sample amounts into the sequence, and understand that the method will have to be calibrated to the working standards each time it has run.

In the past, I was told to use the following expression:
(#RA/#WT) x 100

It was explained to me that raw amount, in totalchrom terms:
area sample/wt.standard x area standard

Unfortunately, my weight percent values do not appear to be correct. Has anyone else had success calculation weight percents using totalchrom?

Any help is sincerely appreciated.

[h20labs]

Looks like this is an old question that went unanswered. But I'll take a stab.

My analysis requires the use of a %solid. A 98% solid sample indicates that 2% of the samples weight was water. To account for that 2% of water weight in our "final results" I enter 0.98 into the "sample amt" column of my sequence. You should notice the adjustment in your "raw amount" vs. "adjusted amount".

Hope this helps.