EPA Method 551.1 Surrogate Standard Back Catalog number: 30102 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11438.19-100-IO Diphenyl-o-tolyl phoshate,100 µg/mL,isooctane,1mL, Price on request 97025 Azimsulfuron Price on request 674457 Barban, 100mg Price on request