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integration
Posted: Tue Jul 24, 2007 8:22 am
by helen
What does it exactly mean - "foot point determination"? and "virtual baseline"?
Posted: Tue Jul 24, 2007 10:44 pm
by tom jupille
I would have to see those phrases in context. They sound like translations into English by someone not fully familiar with the actual English technical idioms.
Posted: Wed Jul 25, 2007 5:42 am
by helen
There is a question about peak quantification and evalution of chromatograms.
The question is:
"Is the calculation always the same?
- foot point determination
- virtual base line
- integration parameter
- potential approximations, etc
Posted: Wed Jul 25, 2007 8:17 am
by danko
Foot point must be the peak start and the peak end – threshold.
The virtual baseline could be the line you draw when you integrate a peak.
As Tom mentioned above these are not widely accepted terms in chromatography, so don’t be embarrassed to ask the person who came up with these questions for a clarification.
Best Regards
Posted: Wed Jul 25, 2007 5:28 pm
by Jumpshooter
I have a chromatogram of a peak has a slight fronting, I do not think it is the actual analyte b/c it's about 0.5 min before the analyte peak. But it caused the beginning side of the analyte peak to be up-slanted before it went down to the baseline near it's tail. Is it solvent? or is it actually some part of the peak that has made a shouldering? Any ideas?
Posted: Wed Jul 25, 2007 8:56 pm
by tom jupille
It would really help to see the chromatogram. If you could generate a 400 x 400 pixel (approximately) image and post it, we could see what it actually looks like. A brief description of the embedding procedure is here:
http://www.sepsci.com/chromforum/viewtopic.php?t=2617