PCB Mixture 2, Seven Dutch neat 7 Analytes, each 1mg neat Prod.no. Compound Description CAS No. 1999.12 2,4,4’-Trichlorobiphenyl PCB 28 [7012-37-5] 2000.12 2,2’,5,5’-Tetrachlorobiphenyl PCB 52 [35693-99-3] 2001.12 2,2’,4,5,5’-Pentachlorobiphenyl PC