EPA Method 507 Pesticides Back Catalog number: 95463 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8358.12-50-IO 5,5'-Difluoro-3,3',4,4'-tetrachlorobiphenyl, 50µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. Price on request PFETS Sodium perfluoroethanesulfonate, 50µg/ml in MeOH, 1,2ml Price on request 679842 Triethyl phosphate, 100 µg/ml, Methanol, 5ml Price on request