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Related Experiment Videos

Trichloroacetic acid in the environment.

A McCulloch1

  • 1School of Chemistry, University of Bristol, UK. archie@marbury.u-net.com

Chemosphere
|June 25, 2002
PubMed
Summary
This summary is machine-generated.

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Trichloroacetic acid (TCA) is widespread in the environment, originating from natural processes and water treatment, not solely from industrial solvents. Natural degradation pathways exist, and its presence in conifer needles shows no significant adverse effects in controlled studies.

Area of Science:

  • Environmental Chemistry
  • Ecotoxicology

Background:

  • Trichloroacetic acid (TCA) presence in nature was often attributed solely to chlorinated hydrocarbon solvents.
  • This study critically reviews the environmental fluxes and occurrences of TCA.

Purpose of the Study:

  • To investigate the environmental sources and distribution of trichloroacetic acid (TCA).
  • To assess the natural degradation of TCA and its effects on plant tissues.

Main Methods:

  • Literature review of environmental fluxes and occurrences of TCA.
  • Analysis of TCA concentrations in soil, air, water, precipitation, ice, firn, and plant tissues.
  • Review of studies on TCA degradation pathways (microbial and abiotic) and ecotoxicological effects.

Main Results:

Related Experiment Videos

  • TCA is widely distributed in forest soils (160,000 tonnes yr(-1) in Europe) and from oxidative water treatment (55,000 tonnes yr(-1) globally).
  • Contributions from chlorinated hydrocarbon solvents are minor compared to other sources.
  • TCA is ubiquitous in precipitation, ice, and soils globally, with concentrations showing no significant geographical or temporal trends. Historical ice core data indicate pre-industrial background levels.
  • Coniferous trees may accumulate higher TCA concentrations, but controlled experiments show no significant adverse effects on Scots pine needles at observed concentrations.

Conclusions:

  • TCA's environmental presence is primarily due to natural processes and water treatment, not solely industrial solvents.
  • Natural degradation mechanisms, including microbial dehalogenation and abiotic decarboxylation, effectively remove TCA from the environment.
  • Observed TCA levels in conifer needles do not cause significant harmful effects under controlled experimental conditions.