Our laboratory recently performed the flame AA test for calcium on a sample of potassium hydroxide (from the Reagent Chemicals KOH monograph). The sample weight specified in the monograph (2.0 g) equates to 20 mL of sample stock solution. At that concentration, the potassium was salting out inside the burner slit and causing flame distortion. Could this sample concentration be a typo? This is a GMP analysis, so I can't mess with the sample concentration.