Leaching behavior of Cr(III) in stabilized/solidified soil

Chuanyong Jing, Suqin Liu, George P. Korfiatis, Xiaoguang Meng

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

The leaching behavior of chromium was studied using batch leaching tests, surface complexation modeling and X-ray absorption near edge structure (XANES) spectroscopy. A contaminated soil sample containing 1330 mg-Cr kg-1 and 25 600 mg-Fe kg-1 of dry soil was stabilized/solidified (S/S) with 10% cement, 25% cement, 10% lime and a mixture of 20% flyash and 5% lime. The XANES analysis showed that Cr(III) was the only Cr species in untreated soil and S/S-treated samples. The leachate Cr concentration determined using the toxicity characteristic leaching procedure (TCLP) was reduced from 5.18 mg l-1 for untreated soil to 0.84 mg l-1 for the sample treated with 25% cement. The Cr leachability in untreated and treated soil samples decreased dramatically as the pH increased from 3 to 5, remained at similar levels in the pH range between 5 and 10.5, and further decreased at pH > 10.5. Modeling results indicated that the release of Cr(III) was controlled by adsorption on iron oxides at pH < 10.5, and by precipitation of Ca2Cr2O5 · 6H2O at pH > 10.5.

Original languageEnglish
Pages (from-to)379-385
Number of pages7
JournalChemosphere
Volume64
Issue number3
DOIs
StatePublished - Jun 2006

Keywords

  • Chromium
  • Leaching
  • Stabilization/solidification
  • Surface complexation model
  • XANES

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