Leachability of major and minor elements from soils and sediments of an abandoned coal mining area in Southern Brazil

Maria Josefa Santos, César Ricardo Teixeira Tarley, Isabella Cunha, Iago Zapelini, Evgeny Galunin, Diego Bleinroth, Isadora Vieira, Taufik Abrão

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Leachability of major and trace elements from sediment and soil samples of an abandoned coal mining area in southern Brazil was assessed by titration and pH-stat tests according to the SR002.1 and CEN/TS 14429 protocols. Major (Al, Fe, Ca, Mg, and Mn) and trace (Cu, Zn, As, Ni, Pb, Cd, and Hg) elements were quantified in aqueous extracts. Acid and base neutralizing capacity values and pH changes after the addition of certain acid/base amounts were estimated. In general, a decrease in the major metal leaching at pH < 4.0 and an increase at pH > 8.0 was observed. The response to the acid and base additions confirmed that strong acids can cause an effect on Ca- and Mg-bearing silicate phases and Mn oxides, and strong bases can only affect Ca silicates. At pH < 5.0, higher extractability was found for Cu, Zn, Ni, Pb, and Cd. Considering that the samples showed sharp pH changes after acid additions and released major and trace metal into the solution at greater rates, high metal contamination risks can be assumed for the studied area.

Original languageEnglish
Article number83
Pages (from-to)1-13
Number of pages13
JournalEnvironmental Monitoring and Assessment
Volume187
Issue number3
DOIs
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • Acid mine drainage
  • Acid-base neutralizing capacity
  • Metal leaching
  • Sediment
  • Soil

ASJC Scopus subject areas

  • Environmental Science(all)
  • Pollution
  • Management, Monitoring, Policy and Law

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