EPA Method 552.1 - Surrogate Standard Back Catalog number: 31057 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11629.38-50MG Azithromycin dihydrate,neat,neat,50mg, Price on request 70429 1,2-Epoxybutane Price on request 32311 Ethylbenzene Price on request