PCBs Standard Solution 12 components_x000D_ 10ug/ml each of PCB 77 [CAS:32598-13-3] ; PCB 81 [CAS:70362-50-4] ; PCB 105 [CAS:32598-14-4] ; PCB 114 [CAS:74472-37-0] ; PCB 118 [CAS:31508-00-6] ; PCB 123 [CAS:65510-44-3] ; PCB 126 [CAS:57465-28-8] ; PCB 156 [CAS:38380-08-4] ; PCB 157 [CAS:69782-90-7] ; PCB 167 [CAS:52663-72-6] ; PCB 169 [CAS:32774-16-6] ; PCB 189 [CAS:39635-31-9] in Iso-octane