EPA Method 507 Surrogate Standard Back Catalog number: 19049 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10041.19 6-Acetylmorphine (free base), , Solvent-, Unit , # of units-, Cas.no. Price on request 70912 1,4-Dinitrobenzene, 1000µg/ml in MeOH, 1ml Price on request M293050 Methyl 12-Hydroxystearate, 1g Price on request