EPA Method 552.1 - Surrogate Standard Back Catalog number: 31056 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 12103.5-50MG Glufosinate,neat,neat,50mg, Price on request 679171 D3-Ipronidazole-hydroxy, 10mg Price on request 94294 Organochlorine Pesticide Standard Price on request