EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9495.9-100-IO Tri-n-propylphosphate-d21, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. Price on request 40121 1,2-Dichloroethane-d4 Price on request 50807 ICP Mix #1 Price on request