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CH3041
PCBs V
• The PCBs have been dispersed globally
through atmospheric transport.
through atmospheric transport.
• Although the b.p. of PCBs are high
278 - 415oC they do have some volatility.
278 - 415oC they do have some volatility.
• Wet and dry deposition has resulted in the
introduction of PCBs to the worlds oceans
where they enter the various food chains.
introduction of PCBs to the worlds oceans
where they enter the various food chains.
• In the waterways PCBs have a high
affinity for
particulate matter & sorb to sediments.
on the bottom of rivers, estuaries & oceans.
on the bottom of rivers, estuaries & oceans.
• Microbial decomposition is slow and so
the PCBs remain in the marine ecosystems.
the PCBs remain in the marine ecosystems.
