EPA 1638Mix A Back Catalog number: 52144 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673342 Mepanipyrim, 10.0 µg/ml, Acetonitrile, 10ml Price on request 59414 Thiosulfate (S2O32-) Price on request PCB-PAR-H Native PCB Solution, 1.2ml, nonane Price on request