EPA Method 551.1 Performance Check Soln

Quassin, mixture of isomers w/Neoquassin and Isoquassin, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 76-78-8

2,2',3,4',5,5',6-Heptachlorobiphenyl, neat, Solvent-neat, Unit 5mg, # of units-1, Cas.no. 52663-68-0

4-isopropylphenyl diphenyl phosphate, 1.2ml x 50ug/ml, toluene