EPA Method 507 - Performance Check Solution Back Catalog number: 19130 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 672911 Pyrazosulfuron-ethyl, 100mg Price on request 9488.7-100-IO 4-Iodo-2-methylphenol, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 60577-30-2 Price on request 675405 4-Chlorophenol, 10 µg/ml, Methanol, 10ml Price on request