EPA Method 507 - Performance Check Solution Back Catalog number: 19030 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 4M146 2,2',3,4',5,5'-Hexachloro-4-methoxybiphenyl, 1.2ml x 50ug/ml, nonane Price on request 57234 Selenium (Se) Price on request 8667.14-10MG Flufenacet, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 142459-58-3 Price on request