The Fate of Arsenic in Soil-Plant Systems

Moreno-Jiménez, Eduardo; Esteban, Elvira; Peñalosa, Jesús M.

doi:10.1007/978-1-4614-1463-6_1

Cited by 144 publications

(84 citation statements)

References 204 publications

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“…pH -relation 1:2.5; P, K, Na, Fe and Mn - greater amounts of As were absorbed by the plants with the increment in P doses. The plants accumulated As predominantly in the roots (Figure 1), corroborating with Moreno-Jiménez et al (2012). Unlike P, As has low mobility in the plants, except in hyperaccumulator species .…”

Section: Resultssupporting

confidence: 76%

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Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

Guimarães

Dias

Assis

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe processing of gold ores exploited in Paracatu, MG, generates tailings that are challenging for revegetation, mainly because of the high content of arsenic and salinity. Aiming at the revegetation of the area of disposal of these tailings, the objective of this study was to evaluate the effects of phosphorus doses on vetiver plants (Chrysopogon zizanioides) and on the planting substrate, which consisted of tailings from the processing of ore named B1, exploited in Paracatu, with water restriction. Vetiver was grown for four months in the substrate under doses of 0, 140, 280, 560 and 1280 mg kg -1 of P 2 O 5 . Increasing doses of phosphorus improved the chemical characteristics of the substrate. However, the highest dose (1280 mg kg -1 P 2 O 5 ) resulted in higher toxicity of arsenic for the plants. Under the evaluated conditions, the dose of 560 mg kg -1 of P 2 O 5 is the most suitable for the fertilization of vetiver and, therefore, also for the revegetation of the substrate. Vetiver survives under low availability of water in the tailings.Cultivo de vetiver em um rejeito salino contaminado com arsênio sob doses de fósforo IntroductionSome ores exploited for gold production may contain toxic elements, such as arsenic (As), in their composition, causing environmental problems. In Brazil, gold and iron mining has contributed to the dispersion of As and its entry in the food chain (Campos et al., 2006).The tailings produced in the processing of gold ores exploited in Paracatu, MG, Brazil, have limiting characteristics to plant growth, especially acidity, salinity and high As concentrations, which compromise the process of revegetation of the basin where they are disposed. A practice that can facilitate the establishment of plants in these tailings is phosphate fertilization.The addition of P has been reported as inhibitor of As absorption (Lei et al., 2012). Phosphate and arsenate are chemically similar and share the same membrane transporters in root cells, and the transporters have higher affinity for the phosphate (Tu & Ma, 2003;Zhao et al., 2008).Besides phosphate fertilization, plants tolerant to As and to salinity may have promising responses for the revegetation of tailings. One species with desirable characteristics to start the process of revegetation is Chrysopogon zizanioides (vetiver). The species, besides having high biomass production, has high tolerance and capacity of accumulation of contaminants (Singh et al., 2007).In this context, this study aimed to evaluate the effects of P doses on vetiver plants and on the planting substrate, which consisted of tailings from the processing of one of the gold ores exploited in Paracatu, MG, Brazil, subjected to water restriction. Material and MethodsThe substrate consisted of tailings from the processing of B1 ore, which is a highly weathered phyllite, with sulfide contents around 3.0 g kg -1 , collected in Paracatu, MG, Brazil. Three samples of the substrate were collected for its initial characterization, through the determination of pH i...

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Section: Resultssupporting

confidence: 76%

“…The reduction in the length of roots and shoots and the loss of root ramifications are symptoms of exposure of plants to As (Liu et al, 2005;Moreno-Jiménez et al, 2012). In the present study, the lower proportion of root biomass in the layer of 20-40 cm, at the highest P dose, may result from the toxicity of As.…”

Section: Resultsmentioning

confidence: 43%

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

Guimarães

Dias

Assis

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…Arsenic is found in a variety of geochemical environments at aqueous concentrations varying from <0.5 to >5000 μg/L, and is found in a variety of geochemical environments [1,2]. Natural and anthropogenically-mediated biogeochemical interactions among arsenic species, biota, and minerals can affect the distribution, mobility, and toxicity of As in the environment [2][3][4][5][6][7][8]. Although recent work has posited that arsenic could be a potential biochemical and astrobiological proxy for phosphorus during biological evolution [9], this hypothesis is controversial [10].…”

Section: Arsenic Chemistry Geochemistry Prevalence and Toxicitymentioning

confidence: 99%

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

2014

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A review of the literature about calculating the adsorption properties of arsenic onto mineral models using density functional theory (DFT) is presented. Furthermore, this work presents DFT results that show the effect of model charge, hydration, oxidation state, and DFT method on the structures and adsorption energies for As (oxyhydr)oxide cluster models were calculated using planewave and cluster-model DFT methods.

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“…demersum L. (family Ceratophyllaceae), a worldwidedistributed submerged macrophyte, has been established to accumulate more than 1,000 μg As g −1 dry weight (DW) (Robinson et al 2006). This plant is considered to be suitable for As phytofiltration because it is effective in capturing As from water and grows rapidly (Moreno-Jiménez et al 2012). Besides, its rootless physiological feature and no translocation barrier from roots to shoots make it very different from terrestrial plants and an interesting model for investigating As metabolism in submerged macrophytes.…”

Section: Introductionmentioning

confidence: 99%

Arsenic accumulation and speciation in the submerged macrophyte Ceratophyllum demersum L.

Xue

Yan

Sun

et al. 2012

Environ Sci Pollut Res

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Introduction Ceratophyllum demersum L. is a widespread submerged macrophyte in aquatic environments.Methods Simulation experiments were conducted in the laboratory to investigate arsenic (As) accumulation, speciation, and efflux of C. demersum exposed to arsenate and arsenite solutions. Results Plant shoots showed a significant accumulation of As with a maximum of 862 and 963 μg As g −1 dry weight after 4 days of exposure to 10 μM arsenate and arsenite, respectively. Regardless of whether arsenate or arsenite was supplied to the plants, arsenite was the predominant species in plant shoots. Furthermore, a dramatically higher influx rate of arsenate compared with arsenite was observed in C. demersum exposed to As solutions without the addition of phosphate (P). Arsenate uptake was considerably inhibited by P in this study, suggesting that arsenate is taken up by C. demersum via the phosphate transporters. However, arsenite uptake was unaffected by P and markedly reduced in the presence of glycerol and antimonite (Sb), indicating arsenite shares the aquaporin transport pathway. In addition, C. demersum rapidly reduces arsenate to arsenite in the shoot of the plant and extrudes most of them (>60 %) to the external solutions. The efflux of arsenite was much higher than that of arsenate; the former is supposed to be both active and passive processes, and the latter through passive leakage. Conclusion C. demersum is a strong As accumulator and an interesting model plant to study As uptake and metabolism due to the lack of a root-to-shoot translocation barrier.

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The Fate of Arsenic in Soil-Plant Systems

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Cited by 144 publications

References 204 publications

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

Arsenic accumulation and speciation in the submerged macrophyte Ceratophyllum demersum L.

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