EPA Method 500 Series Internal Standard Back Catalog number: 31004 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677883 Desmethoxy-metobromuron, 10mg Price on request 72606 2’,4’,5’-Trifluoroacetophenone Price on request 0643.28-100-IO alphaßß (20R,24S)-24-Methylcholestane, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 71117-90-3 Price on request