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Replicates of calibration curve lowest standard
Posted: Tue May 27, 2014 7:06 am
by Star Stella
Hi everyone,
I have a question regarding calibration curve lowest standard. Do you prepare lowest and highest standards in duplicate?
In this case are you using mean value or the first preparation value in the regression?
Thanks in advance!
Re: Replicates of calibration curve lowest standard
Posted: Thu May 29, 2014 12:42 pm
by tangaloomaflyer
nope, we don't do this.
Re: Replicates of calibration curve lowest standard
Posted: Thu May 29, 2014 4:05 pm
by tom jupille
In principle, you should use *all* the data points.
Re: Replicates of calibration curve lowest standard
Posted: Sat May 31, 2014 5:17 pm
by James_Ball
Depends on what work you are doing. If you are running under EPA methods it isn't allowed, you only use one standard determination per level, no averaging. I do often prepare them in duplicate and use them to QC the curve afterwards, since if the curve is good and instrument is behaving properly you should be able to quantify them back accurately. Lowest should be able to hit +/- 50% and the high +/- 20% or much less.