EPA Method 507 - Performance Check Solution Back Catalog number: 19130 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 71278 Resmethrin, 1000µg/ml in MeOH, 1ml Price on request 18000-0701D-100ME Metformin-d6-HCl, 100μg/ml in MeOH, 5ml Price on request 9188.22-100-ME Propoxyphene-d5 hydrochloride, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. Price on request