EPA Method 515.1 Internal Standard

alpha alpha alpha (20R,24R)-24-Ethylcholestane, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 62446-14-4

1,2-Dichlorotetrafluoroethane

Flumetralin, 10 µg/ml, Ethyl acetate, 10ml