Polychlorinated terphenyls (PCTs) use, levels and biological effects

Area of Science:

• Environmental Chemistry
• Toxicology
• Ecotoxicology

Background:

• Polychlorinated terphenyls (PCTs) share properties with polychlorinated biphenyls (PCBs), including extreme stability and bioaccumulation potential.
• PCTs are used as substitutes for PCBs, particularly in investment casting waxes.
• Despite limited use, PCTs have been detected widely in environmental matrices and human tissues.

Purpose of the Study:

• To review the environmental occurrence and toxicological profile of Polychlorinated Terphenyls (PCTs).
• To highlight the potential ecological and human health risks associated with PCT exposure.

Main Methods:

• Review of existing literature on PCT detection in environmental samples (soil, water, biota) and human tissues (blood, liver, fat, milk).
• Analysis of toxicological data from animal experiments concerning long-term effects.
• Examination of regulatory status and potential for expanded use in the EEC.

Main Results:

• PCT residues are prevalent in diverse environmental compartments and foodstuffs, indicating widespread contamination.
• Animal studies reveal significant long-term toxic effects, including liver enzyme induction, potential liver damage (including tumors), and disruption of hormonal and immunological systems.
• Reproductive system disturbance is identified as a major ecological hazard for PCTs, similar to PCBs.

Conclusions:

• PCTs pose significant environmental and health risks due to their persistence, bioaccumulation, and demonstrated toxicity.
• The potential for widespread ecological harm, particularly to reproductive systems, necessitates careful consideration of PCT usage.
• Current regulatory frameworks for PCTs are insufficient in many countries, with ongoing considerations for expanded use in regions like the EEC.