EPA Method 528 Internal Standard Back Catalog number: 93188 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8424.7-100MG 2,4,8,10-Tetraoxaspiro[5.5]undecane, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 126-54-6 Price on request 79291 4,4’-DDE Price on request 0457.17-200-IO 1,3,4-Trimethylphenanthrene, 200µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 66271-45-2 Price on request