EPA Method 507 - Performance Check Solution

Metoprolol tartrate, neat, Solvent-neat, Unit 250mg, # of units-1, Cas.no. 56392-17-7

Ditolylphenylphosphate - Mixture of o-,m-,p-tolyl isomers, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no.

Methylisopropylsulfide, neat, Solvent-neat, Unit 1mL, # of units-1, Cas.no. 1551-21-9