Internal Standard Back Catalog number: 96651 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended C17395500 n-Tetracontane, certified, 0.1g Price on request 2734.28-100-IO Brassicasterol, 100µg/mL, Solvent-hexane, Unit 1mL, # of units-1, Cas.no. 474-67-9 Price on request 19049 EPA Method 507 Surrogate Standard Price on request