Influence of a CO2 long term exposure on the mobilisation and speciation of metals in soils

Yang Wei, Patricia Córdoba, Giorgio Caramanna, M Mercedes Maroto-Valer, Paul Nathaniel, Michael D. Steven

Research output: Contribution to journalArticle

6 Citations (Scopus)
57 Downloads (Pure)

Abstract

This study investigates the potential risks associated with high levels and long term exposure of carbon dioxide (CO2) on the mobility and speciation of exchangeable metals in soils. CO2 incubation batch experiments at high pressure and temperature coupled with geochemical modelling were carried out to elucidate the behaviour and mobilisation of metals and the response of soil chemical parameters as a result of long term CO2 exposure. A t-Student analysis was performed to ascertain whether differences in the mean concentration of exchangeable metals in soils before and after CO2-incubations are attributable to increase of metal molibilisation because of the long term CO2 exposure. The t-Student revealed the CO2 long term incubation was statistically significant (p2-soil incubation induces the acidification of the pore water of soils via CO2 hydrolysis and as a consequence, it increases the exchangeable concentration of Ni, Zn, and Pb in the soils. As, Al, Cr, Cu, and Fe show a different mobilisation pattern depending on the moisture content in soils. Al3+, Fe2+, Cr3+, and Cu2+ as free cations, As as HAsO2, Pb2+and PbHCO3-, Zn2+ and ZnHCO3-, are predicted to be the predominant aqueous complexes in the pore water of the incubated soils.

Original languageEnglish
Pages (from-to)475-482
Number of pages8
JournalChemie der Erde - Geochemistry
Volume75
Issue number4
Early online date10 Nov 2015
DOIs
Publication statusPublished - Dec 2015

Keywords

  • Acidification
  • CO exposure
  • CO hydrolysis
  • Exchangeable metals
  • Soil pore water
  • T-Student

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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