EPA Method 8141 Surrogate Standard Back Catalog number: 92387 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3431.9-100 MCPA, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 94-74-6 Price on request 73119 Testosterone Price on request 673513 Chlorthion, 10.0 µg/ml, Ethyl acetate, 10ml Price on request