Copper - 20 PPM Back Catalog number: 50594 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 94422 EPA Method 8270 Additionals Price on request 31282 EPA Method 507 Nitrogen Phosphorus Pesticides Price on request 8776.13-100MG Phenyl 4-hydroxybenzoate, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 17696-62-7 Price on request