EPA Method 1666 Standard #1

Thorium (Th)

4,5-Dihydrobenzo[a]pyrene, 200µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 57652-66-1

2,4,6-Trichlorophenoxyacetic acid, 10 µg/ml, Acet