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Optimisation of pressurised liquid extraction for the determination of p,p'-DDT and p,p'-DDE in aged contaminated Ethiopian soils

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Author

  • Ahmed Hussen
  • Rikard Westbom
  • Negussie Megersa
  • Negussie Retta
  • Lennart Mathiasson
  • Erland Björklund

Summary, in English

The effectiveness of extracting p,p'-DDT and p,p'-DDE from aged contaminated soil samples by means of pressurized liquid extraction (PLE) was evaluated. Two soil samples, which were contaminated more than 10 years ago, were used in the investigation. The static extraction time was optimised and then validated against the total sum of target analytes obtained from multiple sequential extractions. The PLE results were also compared with Soxhlet extraction (SOX). PLE for 3x10 min at 100 degrees C was proven to be more exhaustive than SOX in the determination of p,p'-DDE from both soil samples. In the case of p,p'-DDT, PLE was found to be equally as exhaustive as SOX. Additionally, most of the previous PLE investigations used hazardous organic solvents such as n-hexane, toluene and dichloromethane mixed with acetone, whereas in this investigation the less toxic solvent combination n-heptane/acetone has been employed.

Publishing year

2006

Language

English

Pages

1525-1533

Publication/Series

Analytical and Bioanalytical Chemistry

Volume

386

Issue

5

Document type

Journal article

Publisher

Springer

Topic

  • Analytical Chemistry

Keywords

  • extraction
  • pressurized liquid
  • organochlorine pesticides
  • endocrine disruptors
  • trace organic compounds
  • soil

Status

Published

ISBN/ISSN/Other

  • ISSN: 1618-2642