EPA Method 8121 Surrogate Standard Back Catalog number: 81204 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10859.18-10MG Timolol Maleate Price on request 2103.22-100MG Hexyl 2-ethylhexyl phthalate (isomer mixture), neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 75673-16-4 (CAS of single isomer) Price on request 1083.24-K-IO n-Octadecylbenzene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 4445-07-2 Price on request