6.1  CHEMICAL STANDARDS AND REFERENCE MATERIALS, 1  SET  Name  Qty  PCB Congener Mix, analytical standard, 10 µg/ml each,  in heptane , 1 ml vial  2,2’, 3,4,4’, 5,5’-Heptachlorobiphenyl; 2,2’, 3,4,4’, 5’- Hexachlorobiphenyl  2,2’, 3,4’, 5’, 6-Hexachlorobiphenyl; 2,2’, 4,4’, 5,5’- Hexachlorobiphenyl  2,2’, 3,3’, 4,4’, 5,5’-Octachlorobiphenyl; 2,2’, 4,5,5’- Pentachlorobiphenyl  2,3’, 4,4’, 5-Pentachlorobiphenyl; 2,2’, 3,5’- Tetrachlorobiphenyl  2,2’, 5,5’-Tetrachlorobiphenyl; 2,2’, 5-Trichlorobiphenyl  2,4,4’-Trichlorobiphenyl; 2,4’, 5-Trichlorobiphenyl  2  Alkane standard solution C8-C20  C8, C9, C10, C11, C12, C13, C14, C15,  C16, C17, C18, C19, C20; 40 mg/l each, in hexane, 1ml  4  Alkane standard solution C21-C40  C21, C22, C23, C24, C25, C26, C27, C28,  C29, C30, C31, C32, C33; C34, C35, C36, C37, C38,  C39, C40,  40 mg/l each, in hexane, 1ml  4  Polynuclear Aromatic Hydrocarbons Mix, analytical  standard, 2000 µg/ml each, in methylene chloride  :benzene=1:1, 1ml  1  August 2020 EN-c4f_annexiitechspeciiitechoffer_en.docx  EN-c4f_annexiitechspeciiitechoffer_en.docx Page 18 of 76 