8260Matrix Spike Back Catalog number: 97031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 91059 Triadimefon Price on request 11720.12-100-IO 2,2',4,5',6-Pentachlorobiphenyl ,100 µg/mL,isooctane,1mL, Price on request 8483.19-100-ME Metoprolol tartrate, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 56392-17-7 Price on request