Mobility and phytoavailability of As and Pb in a contaminated soil using pine sawdust biochar under systematic change of redox conditions

Jingzi Beiyuan, Yasser M. Awad, Felix Beckers, Daniel C.W. Tsang, Yong Sik Ok, J�rg Rinklebe

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Abstract

Biochar has been adopted to control the mobility and phytoavailability of trace elements (TEs) in soils. To date, no attempt has been made to determine the mobility and phytoavailability of arsenic (As) and lead (Pb) in a contaminated soil with biochars as amendments under predefined redox potentials (EH). Thus, in this study, a soil contaminated with As and Pb (2047 and 1677�mg�kg−1, respectively) was pre-incubated for 105 days with three amendments (pine sawdust biomass (BM) and two biochars produced from the same feedstock at 300��C (BC300) and 550��C (BC550)). The aged samples were then exposed to dynamic EH conditions to evaluate the mobility and phytoavailability of As and Pb after immobilization. The BM amendment significantly decreased and the BC300 slightly reduced the mobility and phytoavailability of As and Pb, which may be related to the oxygen-containing functional groups on the surface of BM and BC300. In contrast, BC550 increased the mobility of As at�−300 to�−100�mV and 100�mV, enhanced the phytoavailability of As under oxidizing condition (>100�mV), but reduced the phytoavailability of Pb, which might be caused by the properties of amendments and redox chemistry of the TEs. The effectiveness of BM and biochars for the stabilization of As and Pb varied under dynamic EH conditions, which indicates that detailed investigations should be conducted before the applications of biochar as soil amendment under variable environmental conditions, especially for contaminated paddy soils.

Original languageEnglish
Pages (from-to)110-118
Number of pages9
JournalChemosphere
Volume178
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes

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Keywords

  • Charcoal
  • Immobilization
  • Redox processes
  • Soil remediation
  • Trace elements

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemistry(all)

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