EPA Method 502/524 Surrogate Standard #1 Back Catalog number: 30070 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11186.8-10MG Caffeine-d9 (1,3,7-trimethyl-d9),neat,neat,10mg Price on request 1530.13-K-IOX10 Fluorene-d10, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-10, Cas.no. 81103-79-9 Price on request 11988.9-10MG Romifidine,neat,neat,10mg, Price on request