Organic Arsenic in the Soil Environment: Speciation, Occurrence, Transformation, and Adsorption Behavior

Huang, Jen‐How; Hu, Kan‐Nian; Decker, Berryinne

doi:10.1007/s11270-010-0716-2

Cited by 100 publications

(56 citation statements)

References 72 publications

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“…2,3, 49 Because inorganic As is the substrate for methylation, it might be expected that the concentrations of methylated As and inorganic As in soil pore water would correlate with each other. 17 However, no significant positive correlation was found in the present study. Other soil properties such as the availability of trace elements may also influence microbial As methylation.…”

Section: ■ Discussioncontrasting

confidence: 78%

Arsenic Methylation in Soils and Its Relationship with Microbial arsM Abundance and Diversity, and As Speciation in Rice

Zhao

Harris

Jia

et al. 2013

Environ. Sci. Technol.

187

125

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Methylation of arsenic in soil influences its environmental behavior and accumulation by plants, but little is known about the factors affecting As methylation. As speciation was determined in the pore waters of six soils from diverse geographical locations over 54 days of incubation under flooded conditions. The concentration of methylated As (monomethylarsonic acid, MMA, and dimethylarsinic acid, DMA) varied from 0 to 85 μg L −1 (0 − 69% of the total As in pore water). Two Bangladeshi paddy soils contaminated by irrigation of As-laden groundwater produced large concentrations of inorganic As but relatively little methylated As. Two contaminated paddy soils from China produced a transient peak of DMA during the early phase of incubation. Methylated As represented considerable proportions of the total soluble As in the two uncontaminated soils from the UK and U.S. The copy number of the microbial arsenite methyltransferase gene (arsM) correlated positively with soil pH. However, pore-water methylated As correlated negatively with pH or arsM copy number, and positively with dissolved organic C. GeoChip assay revealed considerable arsM diversity among the six soils, with 27−35 out of 66 sequences in the microarray being detected. As speciation in rice plants grown in the soils generally mirrored that in the pore water. The results suggest that methylated As species in plants originated from the soil and As methylation in soil was influenced strongly by the soil conditions. ■ INTRODUCTIONArsenic (As) is a ubiquitous contaminant in the environment originating from both natural and anthropogenic sources. Because its biogeochemical behavior and toxicity vary greatly among different chemical species, it is important to understand how the speciation of As changes in the environment and what drives such changes. A particularly important case is the paddy rice system because it is now recognized that rice is a major source of As in the human diet. 1 The anaerobic conditions in paddy soils are conducive to the mobilization of arsenite, 2,3 which is taken up inadvertently by rice roots through the strong uptake pathway for silicic acid. 4 Rice grain contains both inorganic As (arsenate and arsenite) and organic As (mostly dimethylarsinic acid, DMA; occasionally also trace amounts of monomethylarsonic acid, MMA, and tetramethylarsonium). 5−9 As speciation in rice varies widely among different riceproducing regions. Market-basket surveys show that Asian rice generally is dominated by inorganic As with DMA typically accounting for about 20% of the total As. [5][6][7]10 In contrast, rice produced in the U.S. and Europe is more variable in As speciation with many samples containing more organic than inorganic As. 5,7,8,10 It is possible that that this geographical pattern reflects the relative bioavailability of inorganic versus organic As in different paddy environments. 10 Compared with inorganic As, methylated As species are more easily accumulated in rice grain. 10 Although pentavalent methylated As species are ...

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Section: ■ Discussioncontrasting

confidence: 78%

Arsenic Methylation in Soils and Its Relationship with Microbial arsM Abundance and Diversity, and As Speciation in Rice

Zhao

Harris

Jia

et al. 2013

Environ. Sci. Technol.

187

125

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“…Chinese soils the holding capacity of DPAA was weaker, even in the Acrisol with its high content of iron/aluminum oxides, than inorganic arsenic and other methyl arsenics (Huang et al, 2011), according to the free energy obtained ( …”

Section: Mobility Of Dpaa In Soilsmentioning

confidence: 99%

Adsorption and desorption characteristics of diphenylarsenicals in two contrasting soils

Wang

Teng

et al. 2013

Journal of Environmental Sciences

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Diphenylarsinic acid (DPAA) is formed during the leakage of aromatic arsenic chemical weapons in soils, is persistent in nature, and results in arsenic contamination in the field. The adsorption and desorption characteristics of DPAA were investigated in two typical Chinese soils, an Acrisol (a variable-charge soil) and a Phaeozem (a constant-charge soil), their thermodynamics and some of the factors influencing them (i.e., initial pH value, ionic strength and phosphate) using the batch method in order to understand the environmental fate of DPAA in soils. The results indicate that the Acrisol had a stronger adsorption capacity for DPAA than the Phaeozem. Soil DPAA adsorption was a spontaneous and endothermic process and the amount of DPAA adsorbed was affected significantly by variation in soil pH and phosphate. In contrast, soil organic matter (OM) and ionic strength had no significant effect on adsorption. This suggests that DPAA adsorption may be due to specific adsorption on soil mineral surfaces. Therefore, monitoring the fate of DPAA in soils is recommended in areas contaminated by leakage from chemical weapons.

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“…It occurs as a major constituent in more than 200 minerals as elemental As, arsenides, sulfides, oxides, arsenates, and arsenites (Smedley and Kinniburgh 2002). Its presence in the environment can be due to natural processes, such as weathering, biological, and volcanic activity, or anthropogenic activities (Cullen and Reimer 1989;Huang et al 2011;Pongratz 1998). As is problematic because of its relatively high mobility over a wide range of redox conditions and its toxicity to humans, animals, and plants (Turpeinen et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Factors Controlling the Migration of Tailings-Derived Arsenic: A Case Study at the Yara Siilinjärvi Site

et al. 2016

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The behaviour of arsenic (As) derived from tailings was investigated at the Yara Siilinjärvi apatite mine and industrial site in eastern Finland. The study assessed factors influencing the migration and fate of As and compared the anthropogenic As load to the natural geogenic background. Environmental risks related to As were assessed by examining the As concentrations in humus, glacial till, aquatic sediments, groundwater, and surface water. The occurrence and fractionation of As and the presence of secondary precipitates and geochemical transformations in the tailings and in the ambient soil and sediment were evaluated by selective extraction. The water-derived emissions were evaluated by field measurements, hydrogeochemical analysis, and modelling. Results indicate elevated environmental risks due to dust and seepage emissions from the tailings since the concentrations and mobility of As and other potentially harmful elements (PHEs) such as Co, Ni, and Zn were elevated relative to the geogenic background. These elements were mainly associated with Fe (oxy)hydroxides in the soil and their mobility was closely linked to Fe biogeochemistry. Additionally, although the concentrations of As and PHEs were high in the tailings pond and seepage water, they decreased in ambient groundwater and surface water, indicating Fe (oxy)hydroxide stability. This was supported by hydrogeochemical modelling, which indicated precipitation of Fe oxides and hydroxides. According to speciation modelling, As was present mainly as toxic trivalent arsenious acid (H 3 AsO 3 ) in groundwater and as the less toxic pentavalent As acid (H 2 AsO 4 -and HAsO 4 2-) in surface water.

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Organic Arsenic in the Soil Environment: Speciation, Occurrence, Transformation, and Adsorption Behavior

Cited by 100 publications

References 72 publications

Arsenic Methylation in Soils and Its Relationship with Microbial arsM Abundance and Diversity, and As Speciation in Rice

Arsenic Methylation in Soils and Its Relationship with Microbial arsM Abundance and Diversity, and As Speciation in Rice

Adsorption and desorption characteristics of diphenylarsenicals in two contrasting soils

Factors Controlling the Migration of Tailings-Derived Arsenic: A Case Study at the Yara Siilinjärvi Site

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