Good %RSD, bad retrieval rate???

Chromatography Forum: GC Archives: Good %RSD, bad retrieval rate???
Top of pagePrevious messageNext messageBottom of pageLink to this message  By Anonymous on Tuesday, August 17, 2004 - 03:04 am:

Hello,

my %RSD of the actual method are <1%, but the retreival rate is sometimes up to 10-15%.
The calibration has good (0,995 - 0,999) linearity.
What could be the reason therefore?


Top of pagePrevious messageNext messageBottom of pageLink to this message  By Helmut on Friday, August 20, 2004 - 04:47 am:

The reason is simply that you don't have a good linearity at your calibration ! The number of 9's in the correlation factor is not an indicator for a good linearity !
There was a very good and informative article in LC-GC-Europe, March 2004 about linearity and calibration !
There you can read how to perform and control your linearity in a much better way than with the unefficient correlation factor !

Internet: www.lcgceurope.com


Top of pagePrevious messageNext messageBottom of pageLink to this message  By Mark on Friday, August 20, 2004 - 05:41 am:

I'm sorry for asking such a stupid question here, but what is meant by the retreival rate?

Regards,
Mark


Top of pagePrevious messageNext messageBottom of pageLink to this message  By Seppal on Thursday, August 26, 2004 - 02:40 am:

dont use Rē for calibration check, do a response factor test, thats more interesting

Josef Maria


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