Methylated arsenic species throughout a 4-m deep core from a free-floating peat island

Zaccone, Claudio; Lobianco, Daniela; Raber, Georg; D’Orazio, Valeria; Shotyk, William; Miano, Teodoro; Francesconi, Kevin A.

doi:10.1016/j.scitotenv.2017.11.152

Cited by 10 publications

(4 citation statements)

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“…Sodium (meta) arsenite was used to obtain As(III) solutions (2,5,10,20, and 40 mg/L) that were prepared in deionized water and adjusted at pH 2 and 8, respectively. For adsorption experiments, 0.4 g/L of manganese ferrite NPs were placed in polyethylene bottles of 30 mL to add 10 mL of arsenic solution.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…Chronic arsenic exposure from contaminated water and food could cause severe deleterious effects on worldwide health [2,3]. The prevalent arsenic organic species in nature are the organoarsenicals and methylated forms, whereas the inorganic species comprise arsenite and arsenate [2,4,5]. Arsenic is discharged by industrial processes and used in agricultural applications, but water contamination is most often related to dissolution or leaching of solid-phase arsenic contained within the rocks, soil, and minerals into groundwater [6].…”

Section: Introductionmentioning

confidence: 99%

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Linear and nonlinear kinetic and isotherm adsorption models for arsenic removal by manganese ferrite nanoparticles

et al. 2019

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In the present work, we analyzed the linear and nonlinear model suitabilities for adsorption data from aqueous As(III) removal by manganese ferrite nanoparticles (NPs). Hence, As(III) adsorption onto ferrite NPs was formerly analyzed by the intraparticle diffusion model (IPD). Then, adsorption kinetics was described by the pseudo-first-order (PFO), pseudosecond-order (PSO), and Elovich models, while equilibrium adsorption was fitted to the Freundlich and Langmuir isotherms. Linear and nonlinear kinetic and isotherm models were solved and compared. The nonlinear data fitting was applied through the lsqcurvefit user-defined function (Matlab ver. 7.10.0). The initial adsorption rate was influenced by intraparticle diffusion and surface or film diffusion from the arsenic bulk solution to ferrite NPs, according to the IPD model. Adsorption kinetics of As(III) on manganese ferrite NPs was better described by the PSO model, followed by the Elovich model and then the PFO model. Equilibrium adsorption data were only worthily described by the Freundlich isotherm model. While the PSO, Elovich and Freundlich linear models showed even better fit than the nonlinear models, determinant bias was depicted for the PFO and Langmuir linear models. Thus, to use nonlinear adsorption models is highly advisable, having the Matlab lsqcurvefit function been proven very useful to face such task.

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Section: Adsorption Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Linear and nonlinear kinetic and isotherm adsorption models for arsenic removal by manganese ferrite nanoparticles

et al. 2019

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“…Floating islands can form in bogs, wetlands, lakes and rivers worldwide [MacMillan, ; Brewster, ; Hughes & Gaudet, ; Trivedy et al, ; Oliver & Mckaye, ; Spruce, 1908 and Wallace, 1876 (both cited in Simons, )]. The thickest floating mire ever recorded (400 cm) was observed in central Italy (Zaccone et al, , ). Such floating islands are created by (mostly Sphagnum ) mosses that reach out into the water from the banks.…”

Section: Floating Islandsmentioning

confidence: 99%

Grasping at straws: a re‐evaluation of sweepstakes colonisation of islands by mammals

2019

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Natural rafting is an easy, non-evidence-based solution often used to explain the presence of a variety of species on isolated islands. The question arises as to whether this solution is based on solid scientific grounds. It is a plausible colonisation route only if intricate networks of variables are considered and many different conditions satisfied. This review provides a descriptive account of some of the most critical issues underlying the theory of natural rafting that should be addressed by its supporters. These include: (i) biological variables; (ii) characteristics of the vessels; and (iii) physical variables. Natural rafting may explain the dispersal of poikilotherms with low metabolic rates and low resource requirements that could withstand trans-oceanic crossings, but explaining the transport of homeothermic terrestrial mammals to oceanic islands is more problematic. Drifting at sea exposes organisms to high concentrations of salt, high temperature and humidity excursions, starvation, and above all to dehydration. A sufficiently large group of healthy reproductive individuals of the two sexes should either be transported together, or be able to reassemble after separate crossings, to prevent inbreeding, genetic drift and ultimately extinction. Any vessels of flotsam occupied must minimally provide the animals they transport with sufficient provisions to survive the journey, offer minimum friction and drag through water, and be transported by appropriately directed, sustained, high-speed currents. Thus, a 'sweepstakes colonisation' event would be the result of a lucky combination of all, or at least the majority, of these factors. Some cases throw doubt on the use of a natural rafting model to explain known animal colonisations, with one of the most striking examples being Madagascar. This island is far from the nearest mainland coasts and the sea currents in the Mozambique Channel are directed towards Africa rather than Madagascar, yet, the island was colonised by terrestrial mammals (e.g. extinct hippopotamuses, lemurs, carnivores, rodents and tenrecs) unable to swim and to survive long journeys at sea. In order to assess the feasibility of the natural rafting model in a case such as Madagascar, tests were performed using three variables for which enough information could be obtained from the literature: length of survival without food, survival without water, and sea current speed. The distributions of these variables appear to be log-normal and multiplicative, or follow a power-law, rather than being Gaussian. The tests suggest that a distributional analysis is a more suitable approach than the use of geometric probability to calculate the probabilities associated with the examined data. Such non-linear and self-organising systems may reach a critical point governed by different competing factors. Mammals with high survival requirements, such as lemurs and hippopotamuses, thus may have a virtually zero probability of reaching distant islands by natural rafting. Our results raise doubts as to the va...

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“…Information about inorganic compounds has dominated in investigations of As in soils, whereas organic As compounds, which are sometimes found as minor components of soil, can also reach high concentrations (Singh et al 2015). Methylated As forms have been detected, e.g., in acidic fen soil (Huang and Matzner 2006), in agricultural soil from cotton-producing areas (Bednar et al 2002), in the orchard, upland, and paddy soils (Takamatsu et al 1982) as well as in peat (Zaccone et al 2018). DMA was the second most common organic As species (after arsenobetaine, AsB) in the forest floor, up to 0.006 mg DMA kg −1 , which was 12% of the total extractable As detected by Huang and Matzner (2007).…”

Section: Introductionmentioning

confidence: 99%

Arsenic content in two-year-old Acer platanoides L. and Tilia cordata Miller seedlings growing under dimethylarsinic acid exposure–model experiment

Budzyńska

Goliński

Niedzielski

et al. 2019

Environ Sci Pollut Res

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The presence of cacodylic acid (dimethylarsinic acid, DMA) can be an important factor in limiting the abilities of young tree seedlings to adapt to unfavorable environmental conditions. For this reason, the aim of the study was to estimate the influence of different DMA additions (from 0.01 to 0.6 mM) to modified Knop solution to arsenic (As) and selected forms of this metalloid (As(III), As(V), DMA) phytoextraction by two-year-old Acer platanoides L. and Tilia cordata Miller seedlings. Additionally, the biomass and other elements important in As transport in plants were analyzed. Seedlings of both tree species were able to grow in all experimental systems except the one with the highest DMA concentration (0.6 mM). Exposure of tree seedlings was related to a general decrease in plant biomass. Phytoextraction of As in roots, stems, and leaves increased with a rise of DMA concentration in solution to the highest content of As in A. platanoides and T. cordata roots growing under 0.3 mM (135 ± 13 and 116 ± 14 mg kg−1 dry weight). Arsenic was accumulated mainly in roots, thereby confirming bioconcentration factor values BCF > 1 for all tree seedlings treated with DMA. Exposure of plants to low DMA concentrations (0.01 and 0.03 mM) was related to the transport of this element to aboveground parts, while increased DMA concentration in other experimental systems led to the limitation of As transport to stems, as confirmed by translocation factor values TF < 1. Changes in many other elements such as boron, silicon, phosphorus, or sulfur concentration indicated the possible influence of DMA on the transport of As from roots to leaves. The obtained results show that DMA can be an important factor in modulating As phytoextraction in the studied tree species.Electronic supplementary materialThe online version of this article (10.1007/s11356-018-04121-x) contains supplementary material, which is available to authorized users.

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Methylated arsenic species throughout a 4-m deep core from a free-floating peat island

Cited by 10 publications

References 47 publications

Linear and nonlinear kinetic and isotherm adsorption models for arsenic removal by manganese ferrite nanoparticles

Linear and nonlinear kinetic and isotherm adsorption models for arsenic removal by manganese ferrite nanoparticles

Grasping at straws: a re‐evaluation of sweepstakes colonisation of islands by mammals

Arsenic content in two-year-old Acer platanoides L. and Tilia cordata Miller seedlings growing under dimethylarsinic acid exposure–model experiment

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