EPA Method 500 Series Internal Std #4 Back Catalog number: 32003 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8591.6-100-IP 2,4,5-Tribromo-3,6-difluorophenol, 100µg/mL, Solvent-isopropanol, Unit 1mL, # of units-1, Cas.no. NA Price on request 83506 Dicamba methyl derivative Price on request Q765500 Quinoxyfen, 250mg Price on request