EPA Method 507 Surrogate Standard

2',3,3',4',5,5'-Hexachloro-4-[13C12]biphenylol, 1.2ml x 50ug/ml, toluene

2-Hydroxy-5,6,7,8-tetrahydro-9-methylcarbazole, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no.

25-Hydroxyvitamin D2-d6 (Dimethyl 26,27-d6)