EPA Method 507 Surrogate Standard Back Catalog number: 19049 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1615.14-10MG 2-Methyldiphenylmethane, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 713-36-0 Price on request 677428 Trimethyl phosphate, 250mg Price on request 675466 Spiramycin, 100mg Price on request