Sampling validation: Your experiment?

Hi all!
I’m trying to define my validation criterion for swabbing and rinsing sampling validation.

  1. recovery must be >70% (classical)
    Here problems happen…:stuck_out_tongue:
    I’ve stainless steel plates, pipes to cover for swabbing.
    I’ve stainless steel plates (as model) for rinsing.
    What is your experiment about criterion?
    Between plates and pipes for swabbing, do you compare each other or separate each case? And for swabbing and rinsing?
    What do you use as dispersion criterion between same kind of samples (6 measurement for each kind at one level of concentration corresponding to our limit)?

I’m very intersting to get you feedback…

thanks all

bests regards