EPA Method 507 - Performance Check Solution Back Catalog number: 19137 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 674053 Propamocarb hydrochloride, 250mg Price on request 675251 Quinmerac, 100 µg/ml, Acetonitrile, 5ml Price on request PCB-ST-A Native PCB Stock Solution , 1.2ml , nonane Price on request