EPA Method 642 - Analytes Back Catalog number: 40057 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2628.35-10UG 17 alpha(H),21ß(H)-(22RS)-Pentakishomohopane , neat, Solvent-neat, Unit ca. 10µg , # of units-1, Cas.no. 54370-82-0 Price on request 8577.X-K-W Triton X-114 Price on request 3347.14-100 Coumaphos, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 56-72-4 Price on request