EPA Method 551.1 Surrogate Standard Back Catalog number: 31102 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11734.12-100-IO 2,2',3,3',4,6-Hexachlorobiphenyl ,100 µg/mL,isooctane,1mL, Price on request 50585 pH 1.0 Standard @ 25°C Price on request 679705 13C3-Atrazine-desethyl-desisopropyl, 10mg Price on request