EPA Method 507/1656 Nitrogen Phosphorus Back Catalog number: 31782 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 682237 2,2'-Dihydroxy-4,4'-dimethoxybenzophenone, 1000mg Price on request 673758 Chlorbromuron, 10.0 µg/ml, Ethyl acetate, 10ml Price on request 675129 Brodifacoum, 100 µg/ml, Acetonitrile, 10ml Price on request