Heptachlor-exo-epoxide, 10 µg/ml, Acetonitrile,

EPA Method 525.2 Pesticide Level 3

Dibenz[a,h]anthracene, 1000µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 53-70-3

2,3-Dimethyl-d6-pyrazine