Effect of nano zero-valent iron application on As, Cd, Pb, and Zn availability in the rhizosphere of metal(loid) contaminated soils

Chemosphere
Martina VítkováMichael Komárek

Abstract

Characterisation of geochemical transformations and processes in soils with special focus on the rhizosphere is crucial for assessing metal(loid) bioavailability to plants during in situ immobilisation and phytostabilisation. In this study, the effects of nano zero-valent iron (nZVI) were investigated in terms of the immobilisation of As, Zn, Pb and Cd in two soil types and their potential uptake by plants using rhizobox experiments. Such system allowed monitoring the behaviour of trace elements in rooted and bulk soil compartments separately. Sunflower (Helianthus annuus L.) and ryegrass (Lolium perenne L.) were tested for As-rich (15.9 g As kg-1) and Zn-rich (4.1 g Zn kg-1) soil samples, respectively. The application of nZVI effectively lowered the uptake of all target risk elements into plant tissues. Efficient immobilisation of As was determined in the As-soil without a significant difference between plant and bulk soil compartments. Similarly, a significant decrease was determined for CaCl2-available fractions of Zn, Pb and Cd in nZVI-treated Zn-soil. The behaviour of As corresponded to changes in Eh, while Zn and Cd showed to be mainly pH-dependent. However, despite the observed stabilisation effect of nZVI, high amounts ...Continue Reading

Citations

Feb 7, 2020·Scientific Reports·Diego BaragañoJosé Luis R Gallego
Jun 14, 2020·Environmental Science and Pollution Research International·Diego BaragañoJosé Luis R Gallego
Jan 30, 2021·Journal of Hazardous Materials·Yanlong WangDaohui Lin
Jun 3, 2021·International Journal of Environmental Research and Public Health·Danlian HuangGuangfu Wang
Sep 30, 2021·Analytical and Bioanalytical Chemistry·Dawei LiBei Lv
May 1, 2020·Ecotoxicology and Environmental Safety·Xiaoyu LiXiaolan Zeng
Dec 4, 2021·Environmental Science and Pollution Research International·Philippe N BertinMichel Mench

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