Our laboratory here in Brazil is passing through an Iso 17025 accreditation, and i’m responsible for validating gas chromatographic methods.
We analyze water, all types of it : purified, underground, treated, etc…
I’m basing our method on EPA methods, such like 8260C.
The principal analysis is volatile organic compounds with GC/MS and Head-space
My doubt: When i’ll quantify after the analysis, i’ll use my primary curve ( I’ve made a calibration curve adding the standards into purified and clean water ). So, do i have to make a calibration curve for each matrix ( different types of water)???:rolleyes:
Another specific question: When i’m using the surrogates and istd’s… I’ll have to make a calibration curve for them? and then spike to the standards to calculate the recovery right? But, as far as i know, surrogates have to be applied after the sample preparation and before the analysis ( is that correct? ), so… what happens if i have an auto-sampler??? :mad:
Thanks to everybody!