Properties

Most of the PCB congeners in pure form are colourless, odourless crystals. Commercial PCB mixtures are clear viscous liquids. Viscosity ofmixtures increase with the number of chlorine atoms attached to biphenyl. Generally PCBs have low water solubilities and low vapour pressures at 25'C, but they are soluble in many organic solvents, oils, and fats.

Congener Group Molecular weight (g/mol)

Vapour Pressure

     (Pa)

Water Solubility

    (g/m3)
log KOW
Monochlorobiphenyl 188.7 0.9-2.5 1.21-5.5 4.3-4.6
Dichlorobiphenyl 223.1 0.008-0.60 0.06-2.0 4.9-5.3
Trichlorobiphenyl 257.5 0.003-0.22 0.015-0.4 5.5-5.9
Tetrachlorobiphenyl 292.0 0.002 0.0043-0.010 5.6-6.5
Pentachlorobiphenyl 326.4 0.0023-0.051 0.004-0.02 6.2-6.5
Hexachlorobiphenyl 360.9 0.0007-0.012 0.0004-0.0007 6.7-7.3
Heptachlorobiphenyl 395.3 0.00025 0.000045-0.0002 6.7-7
Oktachlorobiphenyl 429.8 0.0006 0.0002-0.0003 7.1
Nonachlorobiphenyl 464.2 - 0.00018-0.0012 7.2-8.16
Dekachlorobiphenyl 498.7 0.00003 0.000001-0.0000761 8.26


Structure formula of 2,2',3,4,5,6'-Hexachlorobiphenyl


3D structure of 2,2',3,4,5,6'-Hexachlorobiphenyl

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