EPA Method 507 - Performance Check Solution Back Catalog number: 19030 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2959.12-100-IO Methyl viologen-d8 dichloride (rings-d8), 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 347841-45-6 Price on request 15100-0231D-10CY5 PCB 52-d3, 10µg/ml in Cyclohexane, 5ml Price on request 674534 Benzyldimethyldodecylammonium chloride, 10.0 µg/ml Price on request