Composition: PCB 28 10ug/ml [7012-37-5] PCB 31 10ug/ml [16606-02-3] PCB 52 10ug/ml [35693-99-3] PCB 101 10ug/ml [37680-73-2] PCB 118 10ug/ml [31508-00-6] PCB 138 10ug/ml [35065-28-2] PCB 153 10ug/ml [35065-27-1] PCB 180 10ug/ml [35065-29-3]