The role of radial oxygen loss on the flux of arsenic and other elements in rice rhizosphere

In this study, we combined diffusive gradients in thin films (DGT) with planar optode (PO), a two-dimensional (2D) in situ chemical techniques for investigating the geochemical behaviors of arsenic in rice rhizosphere soil and bulk soil at high spatial resolution (sub-mm). We had observed three dist...

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Bibliographic Details
Published inEnvironmental Arsenic in a Changing World pp. 261 - 262
Main Authors Yin, D., Luo, J., Fang, W., Williams, P.N.
Format Book Chapter
LanguageEnglish
Published CRC Press 2019
Edition1
Subjects
Inductively Coupled Plasma Mass Spectrometry
Root Plaque
Affect Metals Mobility
Monomethylarsonic Acid
Elements Flux
Hydride Generation Atomic Fluorescence Spectroscopy
Rice Rhizosphere
Soil Water Interfaces
Arsenic Groundwater
Dimethylarsinic Acid
DGT
Bacteria Sulfate Reduction
AS3MT
Datong Basin
ICP MS Analysis
Radial Oxygen Loss
High Arsenic Groundwater
SEM
Trace Elements Uptake
Soil Contamination
Ars Operon
Arsenic Groundwater Contamination
Rice Roots
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Summary:In this study, we combined diffusive gradients in thin films (DGT) with planar optode (PO), a two-dimensional (2D) in situ chemical techniques for investigating the geochemical behaviors of arsenic in rice rhizosphere soil and bulk soil at high spatial resolution (sub-mm). We had observed three distinctive regions in rice rhizosphere: soil-water interfaces (SWI, O+), rhizosphere aerobic soils (O+) and bulk anaerobic soils (O-). The mobility of arsenic and other elements is greater in rhizosphere than bulk zone, flux maxima for As, Fe, P, Pb had also been observed around root tips. Our results indicate rice rhizosphere is a special unit to gather oxygen and affect metals mobility, both flux maxima for metals and radial oxygen loss from root tips are common existed in rice rhizosphere. We have provided new evidence for the importance of rhizosphere oxidation and coupled diffusion in modulating arsenic mobilization and dispersion, showing microniches are important geochemical phenomena exploited by rice plants to acquire metals or nutrients.
ISBN:1138486094
9781138486096
DOI:10.1201/9781351046633-104