EPA Method 500 Series Internal Standard Back Catalog number: 31004 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 681413 Piroxicam, 250mg Price on request 0473.18-200-T 2,3,6,7-Tetramethylanthracene, 200µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 15254-25-8 Price on request 675586 Sulfaphenazole, 100mg Price on request