Improvement of the sequential extraction procedure based on supercritical CO2 and subcritical H2O solvents for the estimation of the environmentally mobile potentially toxic element fractions of sediments and soils

Anita Takács, Katalin Kovács, Gábor Halász, Zoltán Gyori, Ilona Fekete, György Heltai, Márk Horváth

Research output: Contribution to journalArticle

Abstract

The estimation of environmental risk caused by pollution with potentially toxic elements (PTE) is usually carried out using the (3+1) step sequential extraction procedure suggested in 1993 by the Community Bureau of Reference (BCR). In the 1st step the water-soluble, exchangeable and carbonate-bound element content is extracted with acetic acid. In 2002 a fractionation procedure based on the application of supercritical CO2, subcritical H2O and of a mixture of subcritical H2O/CO2 was proposed, which allowed the water-soluble and carbonatebound element contents to be extracted separately from sediment or soil samples weighed into the preparative column of a supercritical fluid extractor and diluted with quartz sand in a mass ratio of 1:20. The aim of the present study was to develop a new reduced-size column construction with which this dilution rate could be decreased to 1:2. A kinetic study was performed to determine the extraction time necessary for samples with different carbonate contents and the extracted element contents were compared to the results of the BCR sequential procedure on the same samples. It was established that fractionation using the reduced-size column may be a rapid way to obtain more reliable information on the easily mobilizable (watersoluble and carbonate-bound) PTE content of soils and sediments than was previously available to supplement BCR fractionation.

Original languageEnglish
Pages (from-to)35-48
Number of pages14
JournalAgrokemia es Talajtan
Volume67
Issue number1
DOIs
Publication statusPublished - Jun 2018

Keywords

  • Fractionation
  • Kinetics
  • Mobilization
  • Potentially toxic elements (PTE)
  • Sequential extraction
  • Supercritical

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

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