Quantification of Cr(VI) in soil samples from a contaminated area in northern Italy by isotope dilution mass spectrometry.

Gian Maria Beone, Silvia Queipo Abad, Pablo Rodríguez-González, J. Ignacio García Alonso

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The aims of the work were to detect and quantify hexavalent chromium in 14 soil samples from an area in Lombardia (northern Italy) contaminated by two polluted water plumes. Cr(VI) was extracted from the solid samples by applying focused microwaves in an alkaline medium after Cr(III) complexation with EDTA. Cr(VI) was reduced to Cr(III) when previously reported extraction conditions for the analysis of certified reference materials were used, and Cr(VI) could not be reliably quantified in the soil samples. The influence of organic matter and iron contents in the samples on the reduction of Cr(VI) was subsequently studied using a new set of soil samples with different iron and organic matter concentrations. Isotope dilution mass spectrometry (IDMS) measured two different enriched stable isotopes of Cr (54 and 53) to evaluate the reduction extent of hexavalent chromium during the analytical procedure. The extraction conditions were optimized to obtain the lowest amount of Cr(VI) reduction and quantify Cr(VI) in the polluted soil samples from Lombardia.
Original languageEnglish
Pages (from-to)17569-17576
Number of pages8
JournalENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL
Publication statusPublished - 2015

Keywords

  • Chromium
  • speciation

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