EPA Method 531.1 - Performance Check Solution

4-n-Butylbenzoic acid, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 20651-71-2

2-Methoxy-5-chlorobiphenyl, 100µg/ml in IO, 1ml

(24S)-24-Ethylcholesta-3,5,22-triene, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 102491-96-3