PCB Congeners Back Catalog number: 92262 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677990 Profenofos, 100 µg/ml, Toluene, 1ml Price on request EPA-23IS Internal Standard Solution, 1.2ml, nonane Price on request 72508 2,3-Butanedione Price on request