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Absence of compound

http://www.chromforum.org/viewtopic.php?t=26096

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Absence of compound

Posted: Wed Dec 24, 2014 9:09 am
by chandresh.soni
Hi everyone
I want to know in which case we can say that a compound is absent in another compounds (as in one method or technique it may absent but on another method or technique it may present on ppm level or there are so many techniques present which can trace up to fentogram level.

Re: Absence of compound

Posted: Wed Dec 24, 2014 10:43 am
by Peter Apps
You can never show that a compound is absent. All you can do it to report it as not detected, with a statement of the lower limit of detection of the method.

Peter

Re: Absence of compound

Posted: Wed Dec 24, 2014 2:10 pm
by skunked_once
To quote someone else "Absence of evidence is not evidence of absence".

Re: Absence of compound

Posted: Wed Dec 24, 2014 3:14 pm
by Consumer Products Guy
Read and re-read the above two posts. We frequently get asked similar.
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