EPA Method 551.1 Performance Check Soln

(±)-Sotalol-d7 hydrochloride (isopropyl-d7),100 µg/mL,MeOH,1mL,

Stigmasterol-d6 (Major), 2,5mg

3,4,4'-Trichlorobiphenyl, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 38444-90-5