EPA Method 528 Internal Standard Back Catalog number: 93188 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2803.21-100-AN Stanozolol,100 µg/mL,acetonitrile,1mL, Price on request 0655.30-K-IO Squalene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 111-02-4 Price on request 3125.18-100-IO Benzyl-n-butyl phthalate-3,4,5,6-d4, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 93951-88-3 Price on request