Arsenic Dissolution from Japanese Paddy Soil by a Dissimilatory Arsenate-Reducing Bacterium <i>Geobacter</i> sp. OR-1

Ohtsuka, Toshihiko; Yamaguchi, Noriko; Makino, Tomoyuki; Sakurai, Kazumasa; Kimura, Kenta; Kudo, Keitaro; Homma, Eri; Dong, Dian Tao; Amachi, Seigo

doi:10.1021/es400231x

Cited by 159 publications

(78 citation statements)

References 55 publications

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“…An increased concentration of As(III) in soil solution is sometimes observed in flooded paddy fields (Takahashi et al 2004), suggesting that arsenic is dissolved from paddy soil. Although microbial activity can affect arsenic mobilization indirectly via reductive dissolution of iron (hydr)oxides associated with arsenic (Cummings et al 1999), numerous studies have revealed that As(V) reduction might be a key process controlling arsenic mobilization (Yamamura et al 2008;Ohtsuka et al 2013). Recently, Yamaguchi et al (2011) found that microbial activity was indispensable for reduction of As (V) to As(III), when two Japanese paddy soils were incubated under reducing conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of soil microorganisms on arsenite oxidation in paddy soils under oxic conditions

Dong

Yamaguchi

Makino

et al. 2014

Soil Science and Plant Nutrition

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The contribution of abiotic and biotic processes to the oxidation of arsenite [As(III)] when anaerobic paddy soils were shifted to oxic conditions was investigated. Soil slurries were first incubated under reducing conditions to allow indigenous arsenic (As) to be dissolved into the liquid phase as As(III), and were then switched to oxic incubation conditions with shaking. One day after switching to oxic incubation, As(III) almost disappeared from the liquid phase without any increase of arsenate [As(V)], suggesting that dissolved As(III) was coprecipitated or adsorbed on the soil solid phase. X-ray adsorption near-edge structure (XANES) analysis revealed that the predominant species of As in the solid phase before the oxic incubation was As(III), ranging from 74 to 85% of total As. After 1 d of the oxic incubation, the proportion of As(III) decreased to 46-47%. This oxidation step was an abiotic process and 28-38% of As(III) was oxidized per day on average. However, the abiotic oxidation ceased within 24 h probably due to passivation of reactive sites on the mineral surface. Afterward, a second slow oxidation step (2.5-2.8% per day on average) became predominant. Interestingly, this step was microbiologically mediated, since it did not occur in sterilized soil slurries. Determination of putative arsenite oxidase gene (aioA) sequences suggested that arsenite-oxidizing bacteria are actually present in our soil slurries. Our results suggest that microbial As(III) oxidation accounts for more than 30% of total As(III) oxidation, and thus it is an important process especially after abiotic oxidation ceases.

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Section: Introductionmentioning

confidence: 99%

Effect of soil microorganisms on arsenite oxidation in paddy soils under oxic conditions

Dong

Yamaguchi

Makino

et al. 2014

Soil Science and Plant Nutrition

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“…The existence of genes for As(V) respiration in several Geobacter genomes may enhance the As resistance of certain Geobacter species (Lear et al 2007;Giloteaux et al 2012;Hery et al 2008). Ohtsuka et al (2013) reported Geobacter sp. OR-1 isolated from Japanese paddy soil was a dissimilatory arsenate-reducing bacterium.…”

Section: Discussionmentioning

confidence: 99%

Arsenic modulates the composition of anode-respiring bacterial community during dry-wet cycles in paddy soils

Wang

Chen

et al. 2016

J Soils Sediments

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Purpose Bacteria able to extracelluar respiration, which could be enriched in the anode of microbial fuel cells (MFCs), play important roles in dissimilatory iron reduction and arsenic (As) desorption in paddy soils. However, the response of the bacteria to As pollution is unknown. Materials and methods Using soil MFCs to investigate the effects of As on anode respiring bacteria (ARB) communities in paddy soils exposed to As stress. The soil MFC performances were evaluated by electrochemical methods. The bacterial community compositions on anodes were studied using Illumina sequencing. Results and discussion In wet 1 phase, polarization curves of MFCs showed cathode potentials were enhanced at low As exposure but inhibited at high As exposure. In the meantime, anode potentials increased with As levels. The dry-wet alternation reduced As levels in porewater and their impacts on electrodes microorganisms. Arsenic addition significantly influenced the anode microbial communities. After dry-wet cycles, Deltaproteobacteria dominated in the anode with high As. Conclusions The dynamic changes of the communities on cathodes and anodes of soil MFCs in paddy soils with different As addition might be explained by their different mechanisms for As detoxification. These results provide new insights into the microbial evolution in As-contaminated paddy soils.

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“…Therefore, we suppose that As(III) oxidation took place faster than As(III) adsorption at this concentration of As(III) (160 mM)and cells(10 9 CFU ml À1 ). In the case of microbial reduction, Huang et al and Ohtsuka et al indicated that the reduction of adsorbed As(V) is much slower than that of dissolved As(V) by As(V)-reducing bacteria (Huang et al, 2011b;Ohtsuka et al, 2013). They demonstrated that the presence of minerals hindered microbial As(V) reduction.…”

Section: Arsenic Adsorption In the Presence Of Bacteriamentioning

confidence: 99%

“…According to mechanisms of As(V) reduction in solid phase (Huang et al, 2011b;Ohtsuka et al, 2013), there might be two explanations of As(III) oxidation in solid phase: one is directly oxidation of As(III) in solid phase; one is that the attachment of cells promoted As(III) desorption, and the desorbed As(III) was oxidized followed by adsorption of As(V) on the solid phase (Dong et al, Fig. 3.…”

Section: Comparison Of As(iii) Oxidation In Three Cell-iron Oxide Sysmentioning

confidence: 99%

The fate of arsenic adsorbed on iron oxides in the presence of arsenite-oxidizing bacteria

Zhang

Yin

et al. 2016

Chemosphere

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h i g h l i g h t sMicrobial cells lowered total As adsorption by minerals. Microbial oxidation proceeded much slowly in solid phase than in aqueous phase. Minerals with a higher affinity for As(III), hindered As(III) oxidation more. Under aerobic conditions, As(V) is the primary form in solid and aqueous phases. a b s t r a c t Arsenic (As) is a redox-active metalloid whose toxicity and mobility in soil depend on its oxidation state. Arsenite [As(III)] can be oxidized by microbes and adsorbed by minerals in the soil. However, the combined effects of these abiotic and biotic processes are not well understood. In this study, the fate of arsenic in the presence of an isolated As(III)-oxidizing bacterium (Pseudomonas sp. HN-1, 10 9 colonyforming units (CFUs)$ml À1 ) and three iron oxides (goethite, hematite, and magnetite at 1.6 g L À1 ) was determined using batch experiments. The total As adsorption by iron oxides was lower with bacteria present and was higher with iron oxides alone. The total As adsorption decreased by 78.6%, 36.0% and 79.7% for goethite, hematite and magnetite, respectively, due to the presence of bacteria. As(III) adsorbed on iron oxides could also be oxidized by Pseudomonas sp. HN-1, but the oxidation rate (1.3 mmol h À1 ) was much slower than the rate in the aqueous phase (96.2 mmol h À1 ). Therefore, the results of other studies with minerals only might overestimate the adsorptive capacity of solids in natural systems; the presence of minerals might hinder As(III) oxidation by microbes. Under aerobic conditions, in the presence of iron oxides and As(III)-oxidizing bacteria, arsenic is adsorbed onto iron oxides within the adsorption capacity, and As(V) is the primary form in the solid and aqueous phases. a r t i c l e i n f o

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Arsenic Dissolution from Japanese Paddy Soil by a Dissimilatory Arsenate-Reducing Bacterium Geobacter sp. OR-1

Cited by 159 publications

References 55 publications

Effect of soil microorganisms on arsenite oxidation in paddy soils under oxic conditions

Effect of soil microorganisms on arsenite oxidation in paddy soils under oxic conditions

Arsenic modulates the composition of anode-respiring bacterial community during dry-wet cycles in paddy soils

The fate of arsenic adsorbed on iron oxides in the presence of arsenite-oxidizing bacteria

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