Chemical fractions of Lead and Zinc in the contaminated soil amended with nanobiochar

Document Type : Research Paper

Authors

Department of Soil Sciences, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

10.22059/jne.2023.361176.2569

Abstract

High concentration of heavy metals in soil directly affects soil and water quality and human safety. Therefore, decreasing mobility of metals, especially in contaminated soils by cost-effective amendments can solve environmental problems. The aim of this study was to evaluate the effect of nanobiochar on the mobility of lead (Pb) and zinc (Zn) in contaminated calcareous soils. This study was carried out as a factorial experiment based on a randomized complete design with two factors including: 1) type of bioadsorbents (4 type) and rate of bioadsorbents (3 rate) for 90 days in three replications. At the end of incubation period, Pb and Zn availability and their chemical fractions were measured. The results showed that the greatest reduction in Pb and Zn availability was observed in soil treated with Fe-NB. The Pb and Zn availability in Fe-NB-1% decreased by 34.65 and 15.38% compared to the control treatment, respectively. Application of biochar, especially in nano size, significantly (P<0.05) decreased the exchangeable fraction and increased iron and manganese oxide bound and residual fractions of the metals in comparison to the control treatment. The IR Values increased and MF values decreased with increasing biochars and nanobichars levels that indicating a decrease in the mobility of metals in the soil. In general, the addition of nanobiochar in soil causes the transformation of metals from unstable form (exchangeable and carbonate forms) to stable forms (iron and manganese oxide bound and residual forms) and further reduces the mobility of metals in the soil.

Keywords

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