Dioxin like F-PCB mixture 9 Analytes, each 10 µg/mL in isooctane 2863.12 5-Fluoro-3,3',4,4'-tetrachlorobiphenyl 5-F-PCB-77 2344.12 3'-Fluoro-3,4,4',5-tetrachlorobiphenyl 3'-F-PCB-81 2864.12 5'-Fluoro-2,3,3',4,4'-pentachlorobiphenyl 5'-F-PCB-105