EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended YA19000017ME Phenol-Mix 17, 1000µg/mL in MeOH, 1ml Price on request 676773 4,4'-Diaminodiphenyl sulfide, 250mg Price on request 675628 Isoxathion, 100 µg/ml, Ethyl acetate, 5ml Price on request