EPA Method 525 Internals & Surrogates Back Catalog number: 95227 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 96927 Aldehyde & Ketone Standard Price on request 10091.18-K-ME Estrone Price on request 2041.4-50-ME Perfluorobutane sulfonic acid, 50ug/ml, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 59933-66-3 Price on request