EPA Method 515.1 Surrogate Standard Back Catalog number: 30022 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10940.15-100-ME Tramadol-13C,d3 HCl, 100µg/ml in MeOH, 1ml Price on request 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 10371.8-K-ME Valproic acid-d6 Price on request