EPA Method 528 Fortification Solution

(24R)-24-Methyl-3,5-cyclocholestane and (24R)-24-Ethyl-3,5-cyclocholestane, 200µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 36545-67-2 / '38776-72-6

3-(Methylthio)thiophene, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 20731-74-2

Promecarb, 100 µg/ml, Acetonitrile, 5ml