Monitoring localized changes of Cr(VI) bioavailability related to root-induced changes around rice roots

Transformation between Cr(III) and Cr(VI) occurs in Cr-contaminated soils. Although redox conditions and biotic/microbial activity are known to be important factors in determining Cr transformation and accumulation in soil-rice systems, how spatial trends and specific soil processes regulate Cr behav...

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Bibliographic Details
Published in:Rhizosphere Vol. 28; p. 100808
Main Authors: Liu, Zhaodong, Wang, Haicui, Zhang, Hanlin, Jing, Yongping, Bo, Luji, Zhong, Ziwen, Wang, Guifeng, Wang, Yanqin, Li, Yan
Format: Journal Article
Language:English
Published: 01.12.2023
Subjects:
bioavailability
films (materials)
microbial activity
phosphates
remediation
rhizosphere
rice
soil
ISSN:2452-2198, 2452-2198
Online Access:Get full text
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Summary:Transformation between Cr(III) and Cr(VI) occurs in Cr-contaminated soils. Although redox conditions and biotic/microbial activity are known to be important factors in determining Cr transformation and accumulation in soil-rice systems, how spatial trends and specific soil processes regulate Cr behaviour around lowland/flooded rice roots are poorly understood. In this study, the Cr(VI) bioavailability was evaluated using the diffusive gradients in thin film (DGT) technology. Root activity reduced Cr(VI) bioavailability. The Cr(VI) flux near rice roots was 1.27–3.92 times lower than that in bulk soil (0.94 ng cm⁻² h⁻¹). The radial extension of the strong influence zone (R1) in the rhizosphere of C-LYZ was smaller than that in Hui-LY985. Although Fe(II) and S²⁻ were involved in Cr(VI) reduction, they were not the primary influence, especially for the rhizosphere region. The high phosphate concentration in the C-LYZ rhizosphere hindered Cr(VI) uptake. The DGT technique overcomes the limitations of traditional research methods, revealing the spatial variability in Cr(VI) and its interactions with other elements in the rhizosphere, thereby providing theoretical basis for bioavailability evaluation and remediation of Cr-contaminated soils.
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ISSN:2452-2198
2452-2198
DOI:10.1016/j.rhisph.2023.100808