Effect of reductive dissolution of iron (hydr)oxides on arsenic behavior in a water–sediment system: First release, then adsorption

Yang, Chao; Li, Shiyu; Liu, Rengbing; Sun, Peng; Liu, Kai

doi:10.1016/j.ecoleng.2015.06.018

Cited by 39 publications

(17 citation statements)

References 32 publications

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“…Previous studies had revealed that soil pH is a key factor in shaping soil microbial diversity and composition since the intracellular pH of most microorganisms is usually within 1 pH unit of neutrality, and any significant deviation in environmental pH value would impose stress on microbes [ 66 ]. Iron (hydr) oxides have been reported to be an important abiotic factor in shaping the microbial community in As contaminated soils because these oxides provide the most important sorption phase for As [ 67 ]. Some arsenite tolerant, anaerobic ferrous iron-oxidizing bacteria such as Geobacter could produce highly crystalline ferric iron minerals that were only slowly reduced by iron-reducing bacteria and thus stimulate the permanent immobilization of arsenic [ 62 , 68 ].…”

Section: Discussionmentioning

confidence: 99%

Bacterial community and arsenic functional genes diversity in arsenic contaminated soils from different geographic locations

Nostrand

et al. 2017

PLoS ONE

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To understand how soil microbial communities and arsenic (As) functional genes respond to soil arsenic (As) contamination, five soils contaminated with As at different levels were collected from diverse geographic locations, incubated for 54 days under flooded conditions, and examined by both MiSeq sequencing of 16S rRNA gene amplicons and functional gene microarray (GeoChip 4.0). The results showed that both bacterial community structure and As functional gene structure differed among geographical locations. The diversity of As functional genes correlated positively with the diversity of 16S rRNA genes (P< 0.05). Higher diversities of As functional genes and 16S rRNA genes were observed in the soils with higher available As. Soil pH, phosphate-extractable As, and amorphous Fe content were the most important factors in shaping the bacterial community structure and As transformation functional genes. Geographic location was also important in controlling both the bacterial community and As transformation functional potential. These findings provide insights into the variation of As transformation functional genes in soils contaminated with different levels of As at different geographic locations, and the impact of environmental As contamination on the soil bacterial community.

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Section: Discussionmentioning

confidence: 99%

Bacterial community and arsenic functional genes diversity in arsenic contaminated soils from different geographic locations

Nostrand

et al. 2017

PLoS ONE

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“…There are important redox sensitive PTEs for which the oxidation state has a large influence on solubility and mobility. For example, Cr(VI) is more mobile than Cr(III), but As(V) is less mobile than As(III) (Frohne et al, 2015;Rinklebe et al, 2016;Schulz-Zunkel et al, 2015;Shaheen et al, 2014b;Yang et al, 2015). Speciation of PTEs within the environment has a distinct influence upon their behaviour; specifically, reactivity, toxicity, mobility and bioavailability within the floodplain (Du Laing et al, 2009;Gambrell, 1994;Hooda, 2010;Rodgers et al, 2015).…”

Section: Influence Of Flooding On Ptes Mobilitymentioning

confidence: 99%

The impact of increased flooding occurrence on the mobility of potentially toxic elements in floodplain soil – A review

Ponting

Kelly

Verhoef

et al. 2021

Science of The Total Environment

101

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The frequency and duration of flooding events are increasing due to land-use changes increasing runoff of precipitation, and climate change causing more intense rainfall events. Floodplain soils situated downstream of urban or industrial catchments, which were traditionally considered a sink of potentially toxic elements (PTEs) arriving from the river reach, may now become a source of legacy pollution to the surrounding environment if PTEs are mobilised by unprecedented flooding events.When a soil floods, the mobility of PTEs can increase or decrease due to the net effect of five key processes; (i) the soil redox potential decreases which can directly alter the speciation, and hence mobility, of redox sensitive PTEs (e.g. Cr, As), (ii) pH increases which usually decreases the mobility of metal cations (e.g. Cd 2+ , Cu 2+ , Ni 2+ , Pb 2+ , Zn 2+ ), (iii) dissolved organic matter (DOM) increases, which chelates and mobilises PTEs, (iv) Fe and Mn hydroxides undergo reductive dissolution, releasing adsorbed and co-precipitated PTEs, and (v) sulphate is reduced and PTEs are immobilised due to precipitation of metal sulphides. These factors may be independent mechanisms, but they interact with one another to affect the mobility of PTEs, meaning the effect of flooding on PTE mobility is not easy to predict. Many of the processes involved in mobilising PTEs are microbially mediated, temperature dependent and the kinetics are poorly understood.Soil mineralogy and texture are properties that change spatially and will affect how the mobility of PTEs in a specific soil may be impacted by flooding. As a result, knowledge based on one river catchment may not be particularly useful for predicting the impacts of flooding at another site. This review provides a critical discussion of the mechanisms controlling the mobility of PTEs in floodplain soils. It summarises current understanding, identifies limitations to existing knowledge, and highlights requirements for further research.

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“…e geochemical behavior of As differs completely from that of other metal(loid)s because it undergoes various geochemical processes, such as adsorption/desorption, precipitation or coprecipitation, and oxidation/reduction [65][66][67][68].…”

Section: Journal Of Chemistrymentioning

confidence: 99%

“…ese processes change the forms of As, which further changes its behavior in the environment and affects its fixation or migration [68,69]. In nature, As exists mainly in the forms of arsenate [As(V)] and arsenite [As(III)].…”

Section: Journal Of Chemistrymentioning

confidence: 99%

“…In nature, As exists mainly in the forms of arsenate [As(V)] and arsenite [As(III)]. Although the major factors responsible for its states have not been clearly identified [68] thus far, the redox potential is considered to be a key factor influencing the form and migration of As [70]. Under oxidizing conditions, As exists predominantly as As(V); however, under reducing conditions with a low redox potential, arsenate is reduced to As(III), which has higher toxicity and mobility [70][71][72].…”

Section: Journal Of Chemistrymentioning

confidence: 99%

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Distinct Dispersion of As, Cd, Pb, and Zn in Farmland Soils near Abandoned Mine Tailings: Field Observation Results in South Korea

Woo

Kang²,

Ji³

et al. 2020

Journal of Chemistry

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We investigated the characteristics of metal(loid) transport and dispersion in agricultural soils near an abandoned metal mine. Topsoil samples were collected from 162 sampling sites in the study area, including 1 in the mine tailing dumps, to analyze the total concentrations of As, Pb, Cd, and Zn. Subsequently, the metal(loid) transport and dispersion characteristics were investigated using geographic information system (GIS) technology. The results of this study clearly demonstrated the variation in the dispersal of As, Cd, Pb, and Zn from the mine tailing dumps to nearby agricultural soils and the element-specific spatial variability in their respective transport and dispersion characteristics. These findings suggested that compared with the migration behavior of Cd, Pb, and Zn, that of As has a farther-reaching impact on agricultural soils owing to its geochemical cycling in the soil and groundwater environment. This impact differed significantly in magnitude from that of the other investigated metals. Therefore, special consideration must be given to the migration behavior of As.

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Effect of reductive dissolution of iron (hydr)oxides on arsenic behavior in a water–sediment system: First release, then adsorption

Cited by 39 publications

References 32 publications

Bacterial community and arsenic functional genes diversity in arsenic contaminated soils from different geographic locations

Bacterial community and arsenic functional genes diversity in arsenic contaminated soils from different geographic locations

The impact of increased flooding occurrence on the mobility of potentially toxic elements in floodplain soil – A review

Distinct Dispersion of As, Cd, Pb, and Zn in Farmland Soils near Abandoned Mine Tailings: Field Observation Results in South Korea

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