EPA Method 531.1 - Performance Check Solution

Cimetidine sulphoxide dihydrochloride, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 54237-72-8

Aldicarb, 10 µg/ml, Acetonitrile, 10ml

Ergosterol, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 57-87-4