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DDT in forest streams.

W N Yule1, A D Tomlin

  • 1Department of Fisheries & Forestry, Chemical Control Research Institute, Canadian Forestry Service, Ottawa 8, Ontario.

Bulletin of Environmental Contamination and Toxicology
|August 31, 2013
PubMed
Summary
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DDT levels in Miramichi River water remained low, with brief spikes during spraying. Forest stream sediments showed lower DDT than soils, with decomposition into DDE and DDD observed.

Area of Science:

  • Environmental Chemistry
  • Ecotoxicology
  • Forestry Science

Background:

  • DDT (Dichlorodiphenyltrichloroethane) was historically used in forest management.
  • Understanding DDT's environmental fate in aquatic ecosystems is crucial.

Purpose of the Study:

  • To assess DDT concentrations in a forest tributary before, during, and after application.
  • To investigate the distribution and persistence of DDT and its metabolites in water and sediments.

Main Methods:

  • Water and sediment sampling over two years post-DDT application.
  • Gas chromatographic analysis of petroleum ether and hexane-acetone extracts.
  • Quantification of DDT, DDE, and DDD residues.

Main Results:

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  • DDT concentrations in water exceeded background levels (0.5 ppb) only briefly during and after spraying (<17 ppb).
  • DDT in stream sediments showed a downstream dilution gradient, with levels 12.5% of forest soil concentrations.
  • Significant decomposition of DDT to DDE and DDD occurred in stream sediments.

Conclusions:

  • DDT's immediate impact on tributary water quality was transient.
  • Forest stream sediments act as a sink and degradation site for DDT, with reduced bioavailability compared to soils.
  • DDT persistence and transformation in aquatic environments warrant continued monitoring.