Arsenic speciation dynamics in paddy rice soil-water environment: sources, physico-chemical, and biological factors - A review

Kumarathilaka, Prasanna; Seneweera, Saman; Meharg, Andrew A.; Bundschuh, Jochen

doi:10.1016/j.watres.2018.04.034

Cited by 273 publications

(73 citation statements)

References 121 publications

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“…Arsenic (As) is a naturally occurring metal that can become concentrated in the environment due to irrigation, mining, burning of fossil fuels, and application of pesticides and wood preservatives. These processes have led to the extensive contamination of paddy soils in southern China, leading to elevated levels of arsenic in the rice grown there, which poses a significant risk to public health in populations that use rice as a food staple (Smedley and Kinniburgh, 2002;Muehe and Kappler, 2014;Kumarathilaka et al, 2018). Long-term arsenic exposure causes many adverse health effects, such as nervous system afflictions, birth defects, diabetes, cancer and skin diseases (Henke, 2009;Meharg and Zhao, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Iron cycling, transformations between oxidized and reduced Fe, and transformation between dissolved and solid species is mainly driven by the microorganisms in the critical zone of the red paddy soils (Weber et al, 2006). Recently, microbial Fe(II) oxidation has been shown to strongly influence the transformation and immobilization of heavy metals due to the formation of biogenic Fe (III) oxyhydroxides (Kumarathilaka et al, 2018). In paddy soils, which have strong oxygen, light, and nitrate gradients when flooded, Fe(II) oxidation can be mediated by three types of Fe(II)-oxidizing bacteria (FeOB), including anoxygenic phototrophic FeOB, microaerophilic FeOB, and anaerobic nitrate-reducing FeOB (Melton et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Biological Fe(II) and As(III) oxidation immobilizes arsenic in micro-oxic environments

Tong

Liu

Hao

et al. 2019

Geochimica et Cosmochimica Acta

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Fe(III) oxyhydroxides play critical roles in arsenic immobilization due to their strong surface affinity for arsenic. However, the role of bacteria in Fe(II) oxidation and the subsequent immobilization of arsenic has not been thoroughly investigated to date, especially under the micro-oxic conditions present in soils and sediments where these microorganisms thrive. In the present study, we used gel-stabilized gradient systems to investigate arsenic immobilization during microaerophilic microbial Fe(II) oxidation and Fe(III) oxyhydroxide formation. The removal and immobilization of dissolved As(III) and As(V) proceeded via the formation of biogenic Fe(III) oxyhydroxides through microbial Fe(II) oxidation. After 30 days of incubation, the concentration of dissolved arsenic decreased from 600 to 4.8 μg L-1. When an Fe(III) oxyhydroxide formed in the presence of As(III), most of the arsenic ultimately was found as As(V), indicating that As(III) oxidation accompanied arsenic immobilization. The structure of the microbial community in As(III) incubations was highly differentiated with respect to the As(V)-bearing ending incubations. The As(III)containing incubations contained the arsenite oxidase gene, suggesting the potential for microbially mediated As(III) oxidation. The findings of the present study suggest that As(III) immobilization can occur in microoxic environments after microbial Fe(II) oxidation and biogenic Fe(III) oxyhydroxide formation via the direct microbial oxidation of As(III) to As(V). This study demonstrates that microbial Fe(II) and As(III) oxidation are important geochemical processes for arsenic immobilization in micro-oxic soils and sediments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biological Fe(II) and As(III) oxidation immobilizes arsenic in micro-oxic environments

Tong

Liu

Hao

et al. 2019

Geochimica et Cosmochimica Acta

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“…Arsenic (As) is a naturally occurring metalloid in the Earth's crust and predominantly occurs bound to iron oxides. However depending on geology, pH, redox status and microbial processes, it can exist in two oxidation states as arsenate (AsV) and arsenite (AsIII) (Li et al, 2017;Beiyuan et al, 2017a, Kumarathilaka et al, 2018a. Besides its natural occurrence in soil and water, arsenic contamination is increasing due to its use in pesticides and various industries, for example the production of precious trace elements.…”

Section: Introductionmentioning

confidence: 99%

“…Soils of various regions have substantially high concentrations of arsenic in the form of minerals that may become available due to alkaline and redox conditions, contaminating water and crops thus leading to a serious environmental hazard (Beiyuan et al, 2017b). Arsenic is a known Class-1 human carcinogen, and exposure to it can result in skin and various other types of cancers and health disorders (Kumarathilaka et al, 2018a).…”

Section: Introductionmentioning

confidence: 99%

Assessment of potential dietary toxicity and arsenic accumulation in two contrasting rice genotypes: Effect of soil amendments

et al. 2019

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High concentration of arsenic (As) in rice is a serious problem worldwide. Pot experiments were conducted to assess the potential dietary toxicity of arsenic and effect of various soil amendments on arsenic accumulation in rice grains. Two basmati rice genotypes were used to conduct pot experiments using various levels of arsenic (10, 25, 50 and 100 mg kg-1 soil). In addition, plants were exposed to soil collected from a well documented arsenic contaminated site. Contrasting results for growth, yield and grain arsenic concentration were obtained for basmati-385 (Bas-385), exhibiting tolerance (56% yield improvement at 10 mg As kg-1), while genotype BR-1 showed 18% yield decline under same conditions. Furthermore, application of soil amendments such as iron (Fe), phosphate (PO 4) and farmyard manure (FYM) at 50 mg kg-1 , 80 kg ha-1 and 10 t ha-1 , respectively improved the plant height and biomass in both genotypes. Accumulation of arsenic in rice grain followed a linear trend in BR-1 whereas a parabolic relationship was observed in Bas-385. Both genotypes exhibited a positive response to iron sulfate amendment with significant reduction in grain arsenic concentrations. Regression analysis gave soil arsenic threshold values of 12 mg kg-1 in Bas-385 and 10 mg kg-1 in BR-1 for potential dietary toxicity. This study suggests that genotype Bas-385 can be used for safe rice production in areas with soil arsenic contamination up to 12 mg kg-1 and that appropriate dose of iron sulfate for soil amendment can be used effectively to reduce translocation of arsenic to rice grain.

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“…Iron and Mn usually co-exist in root plaques (Kumarathilaka et al 2018;Liu et al 2005b). However, we found that root Fe concentrations did not change significantly upon As exposure, in either low-or high-As cultivars (Figs.…”

Section: Discussionmentioning

confidence: 58%

Variation in arsenic accumulation and translocation among 74 main rice cultivars in Jiangsu Province, China

Ya¹,

Lv²,

Shi³

et al. 2020

Environ Sci Pollut Res

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Arsenic (As) is a ubiquitous carcinogen and environmental toxin. In China, rice consumption is a major dietary source of inorganic As. Thus, the development of strategies to decrease As accumulation in rice is of considerable importance. In this study, we investigated variation in As accumulation and translocation among 74 hydroponically grown rice cultivars in Jiangsu Province, China. We also examined the relationships between As accumulation and translocation, and the uptake of elements such as silicon (Si), phosphorus (P), iron (Fe), and manganese (Mn). Our results showed 3.43-, 2.7-, and 6.34-fold variations in shoot As concentration, root As concentration, and root-to-shoot As translocation factors (TFs), respectively, among 74 cultivars, indicating that cultivar genotype significantly affected As accumulation and translocation. Redundancy analysis revealed that As uptake and transport were more closely related to P and Mn uptake than to Si and Fe uptake, for all 74 rice genotypes. In addition, the 20 cultivars that accumulated the least shoot As (low-As), and those that accumulated the most shoot As (high-As), exhibited different strategies in response to As exposure. The As TFs were key factors influencing shoot As concentrations in high-As cultivars, but this was not the case in low-As cultivars. In the latter, more accumulated As were sequestered in roots, which restricted As translocation to shoots, thus leading to lower shoot As concentrations. In addition, the shoot As concentrations of various rice cultivars and their parents differed. The low-As rice cultivar YJ2 exhibited a significantly lower shoot As concentration than its parents, suggesting that it is possible to breed low-As rice cultivars from parents that also exhibit low-As characteristics.

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Arsenic speciation dynamics in paddy rice soil-water environment: sources, physico-chemical, and biological factors - A review

Cited by 273 publications

References 121 publications

Biological Fe(II) and As(III) oxidation immobilizes arsenic in micro-oxic environments

Biological Fe(II) and As(III) oxidation immobilizes arsenic in micro-oxic environments

Assessment of potential dietary toxicity and arsenic accumulation in two contrasting rice genotypes: Effect of soil amendments

Variation in arsenic accumulation and translocation among 74 main rice cultivars in Jiangsu Province, China

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