Selective pressurized liquid extraction for multi-residue analysis of organochlorine pesticides in soil

J Chromatogr A. 2007 Jun 8;1152(1-2):247-53. doi: 10.1016/j.chroma.2007.02.076. Epub 2007 Feb 25.

Abstract

A selective pressurized liquid extraction (SPLE) procedure capable of performing simultaneous extraction and clean-up has been demonstrated for multi-residue analysis of organochlorine pesticides (OCPs) in soil. The final method was performed at 100 degrees C for 3 x 10 min using acetone/n-heptane (1:1, v/v). Florisil was placed inside the extraction cell downstream the sample to remove interfering compounds. Extraction of two soil samples by SPLE gave a recovery which was over 80% for beta-endosulfan, endosulfan sulfate, p,p'-DDT and p,p'-DDE compared to PLE with off-line clean-up. The same trend was observed when applying the SPLE method to a certified reference soil sample (CRM 811-050) containing 13 OCPs, where the SPLE method gave 80-90% recovery vis-à-vis the PLE method with off-line clean-up. Feasibility of the SPLE method was further demonstrated by applying it to five real soil samples collected in Ethiopia.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetone
  • Analytic Sample Preparation Methods / methods*
  • Environmental Monitoring / methods
  • Heptanes
  • Hydrocarbons, Chlorinated / analysis*
  • Pesticide Residues / analysis*
  • Pressure
  • Soil Pollutants / analysis*
  • Solvents
  • Ultrasonics

Substances

  • Heptanes
  • Hydrocarbons, Chlorinated
  • Pesticide Residues
  • Soil Pollutants
  • Solvents
  • Acetone
  • n-heptane