EPA Method 500 Series Internal Standard Back Catalog number: 31004 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 0487.24-200-T Diacenaphthyleno[1,2-b;1',2'-d]thiophene, 200µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 203-42-9 Price on request 683613 D4-Prochloraz Metabolite BTS44596, 100 µg/ml, Ace Price on request 679727 Phorate-sulfoxide, 100 µg/ml, Acetone, 1ml Price on request