Chromatography Forum

How do you determine the appropriate system suitability criteria for the external standard response precision for a residual solvents test? What do you base it on? Since intermediate precision (separate sample and std preps) is the sum of the uncertainty contributions from several places (sample prep, injector, std prep, detector...), the precision will poorer than for the standard response of six bracketing standard injections (injection repeatability) so using the intermediate precision as a sys suitability criteria seems rather loose.

System suitability refers mainly to the instrumental hardware - so in htis case the HS sampler and GC whose performance has a repeatability, linearity and LOD/LOQ.

If you include sample prep, uncertainty of standards etc you are assessing themethod, not the sytem.

Peter