EPA Method 525 Internals & Surrogates Back Catalog number: 91161 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673248 Demeton-S-methyl-sulfone, 10.0 µg/ml, Acetonitril Price on request 10439.9-100MG Ethenzamide Price on request R701552 Rufinamide-15N,d2, 1mg Price on request