EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 679905 Acetochlor, 100 µg/ml, Acetone, 1ml Price on request 11956.21-100-ME Lisinopril dihydrate,100 µg base/mL,MeOH,1mL, Price on request 675628 Isoxathion, 100 µg/ml, Ethyl acetate, 5ml Price on request