EPA Method 624 Surrogate Standard Back Catalog number: 19112 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 96528 Nordiazepam Price on request 11765.12-100-IO 2,2',3,4,5,6,6'-Heptachlorobiphenyl ,100 µg/mL,isooctane,1mL, Price on request 2661.12-10-IOX10 Arochlor 1232, 10µg/mL, Solvent-isooctane, Unit 1mL, # of units-10, Cas.no. 11141-16-5 Price on request