EPA Method 525 Internals & Surrogates Back Catalog number: 91161 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 91625 Surrogate Standard Price on request G597952 Glutathione (glycine-13C2,15N) Disodium Salt, 1mg Price on request A10018000AL-100 Acetochlor, 100µg/mL in Acetonitrile, 1ml Price on request