EPA Method 507 - Performance Check Solution Back Catalog number: 19137 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended MPN-59 1,2,4,5,8-Pentachloro(13C10)naphthalene, 1.2mL x 50ug/mL, nonane Price on request 677772 Ethalfluralin, 250mg Price on request 677534 Chlordecone alcohol, 10.0 µg/ml, Cyclohexane, 1m Price on request