Evaluation of techniques for sampling volatile arsenic on volcanoes

Arndt, Julia; Ilgen, Gunter; Planer-Friedrich, Britta

doi:10.1016/j.jvolgeores.2016.10.016

Cited by 14 publications

(17 citation statements)

References 33 publications

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“…Arsenic in terrestrial bulk deposition was linked to marine productivity in a maritime setting, but that calculation was only for elemental total, not species, ignoring biovolatilization contribution (Figure ). Volcanoes can also emit arsines, primarily the inorganic species arsine (AsH 3 ) with small traces of TMA, with TMA thought to derive from microbial metabolism of arsenic from hydrothermal settings . Knowledge of how arsines derived from volcanic arsine emissions contribute to global budgets is limited, but it appears small …”

Section: Sources and Trends In Atmospheric Arsenic And Subsequent Dep...mentioning

confidence: 99%

“…Volcanoes can also emit arsines, primarily the inorganic species arsine (AsH 3 ) with small traces of TMA, with TMA thought to derive from microbial metabolism of arsenic from hydrothermal settings . Knowledge of how arsines derived from volcanic arsine emissions contribute to global budgets is limited, but it appears small …”

Section: Sources and Trends In Atmospheric Arsenic And Subsequent Dep...mentioning

confidence: 99%

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The Pedosphere as a Sink, Source, and Record of Anthropogenic and Natural Arsenic Atmospheric Deposition

Meharg¹,

Meharg²

2021

Environ. Sci. Technol.

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The Anthropocene has led to global-scale contamination of the biosphere through diffuse atmospheric dispersal of arsenic. This review considers the sources arsenic to soils and its subsequent fate, identifying key knowledge gaps. There is a particular focus on soil classification and stratigraphy, as this is central to the topic under consideration. For Europe and North America, peat core chrono-sequences record massive enhancement of arsenic depositional flux from the onset of the Industrial Revolution to the late 20th century, while modern mitigation efforts have led to a sharp decline in emissions. Recent arsenic wet and dry depositional flux measurements and modern ice core records suggest that it is South America and East Asia that are now primary global-scale polluters. Natural sources of arsenic to the atmosphere are primarily from volcanic emissions, aeolian soil dust entrainment, and microbial biomethylation. However, quantifying these natural inputs to the atmosphere, and subsequent redeposition to soils, is only starting to become better defined. The pedosphere acts as both a sink and source of deposited arsenic. Soil is highly heterogeneous in the natural arsenic already present, in the chemical and biological regulation of its mobility within soil horizons, and in interaction with climatic and geomorphological settings. Mineral soils tend to be an arsenic sink, while organic soils act as both a sink and a source. It is identified here that peatlands hold a considerable amount of Anthropocene released arsenic, and that this store can be potentially remobilized under climate change scenarios. Also, increased ambient temperature seems to cause enhanced arsine release from soils, and potentially also from the oceans, leading to enhanced rates of arsenic biogeochemical cycling through the atmosphere. With respect to agriculture, rice cultivation was identified as a particular concern in Southeast Asia due to the current high arsenic deposition rates to soil, the efficiency of arsenic assimilation by rice grain, and grain yield reduction through toxicity.

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Section: Sources and Trends In Atmospheric Arsenic And Subsequent Dep...mentioning

confidence: 99%

Section: Sources and Trends In Atmospheric Arsenic And Subsequent Dep...mentioning

confidence: 99%

The Pedosphere as a Sink, Source, and Record of Anthropogenic and Natural Arsenic Atmospheric Deposition

Meharg¹,

Meharg²

2021

Environ. Sci. Technol.

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“…In a recent study where multiple marine water certified reference materials (CRMs) were speciated by arsine generation, with those species cryotrapped and the cryo-trap interfaced with inductively coupled plasma -mass spectrometry (ICP-MS), TMAO was quantified at ~0.2 nM concentrations (14). As well as seawater, TMAO/TMA can emanate from soils (15), and can have a volcanic/geothermal origin (16), though the contribution of soils and geothermal sources to the wider environment is relatively low (3,15,16).…”

Section: ____________________________________________________________mentioning

confidence: 99%

Biovolatilization of Arsenic as Arsines from Seawater

Savage¹,

Carey²,

Meharg³

2018

Environ. Sci. Technol.

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Marine sources of arsenic to the atmosphere are normally dismissed as minor. Here we show that arsenic can be biovolatilized from seawater, and that biovolatilzation is based on organic arsenic species present in the seawater. Even though inorganic arsenic is in great excess in seawaters, it is trimethylarsine (TMA) that is the primary biovolatilized product, with dimethylarsine (DMA) also observed if dimethylarsinic acid (DMAA) is spiked into seawaters. With respect to budgets, 0.04% of the total arsenic in the seawater was biovolatilized over a 2-week incubation period. To test the environmental significance of this finding, wet deposition was analyzed for arsenic species at coastal locations, one of which was the origin of the seawater. It was found that the oxidized product of TMA, trimethylarsine oxide (TMAO), and to a less extent DMAA were widely present. When outputs for arsines (0.9 nmol/m/d) from seawater and inputs from wet deposition (0.3-0.5 nmol/m/d) were compared, they were of the same order of magnitude. These findings provide impetus to reexamining the global arsenic cycle, as there is now a need to determine the flux of arsines from the ocean to the atmosphere.

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“…Volatile As species were analyzed by automated cryotrapping/cryofocusing gas chromatography (30 m capillary column, 0.32 mm inner diameter, 4 µm film thickness; Rxi-1MS, Restek, USA) coupled to an electron impact mass spectrometer (Varian CP-3800 with Varian Saturn 2000, Varian, USA) with split to an atomic fluorescence analyzer (AFS; P.S. Analytical; equipped with a superlamp, wavelength: 193.7 nm) as described previously (Arndt et al 2017). For analysis, 50 mL of the gas collected in the Tedlar bags were diluted 1:10 with N 2 .…”

Section: Methodsmentioning

confidence: 99%

Arsenic metabolism in technical biogas plants: possible consequences for resident microbiota and downstream units

et al. 2019

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The metal(loid) and in particular the Arsenic (As) burden of thirteen agricultural biogas plants and two sewage sludge digesters were investigated together with the corresponding microbial consortia. The latter were characterized by ARISA (automated ribosomal intergenetic spacer analysis) and next generation sequencing. The consortia were found to cluster according to digester type rather than substrate or metal(loid) composition. For selected plants, individual As species in the liquid and gaseous phases were quantified, showing that the microorganisms actively metabolize and thereby remove the As from their environment via the formation of (methylated) volatile species. The As metabolites showed some dependency on the microbial consortia, while there was no statistical correlation with the substrate mix. Finally, slurry from one agricultural biogas plant and one sewage sludge digester was transferred into laboratory scale reactors (“satellite reactors”) and the response to a defined addition of As (30 and 60 µM sodium arsenite) was studied. The results corroborate the hypothesis of a rapid conversion of dissolved As species into volatile ones. Methanogenesis was reduced during that time, while there was no discernable toxic effect on the microbial population. However, the utilization of the produced biogas as replacement for natural gas, e.g. as fuel, may be problematic, as catalysts and machinery are known to suffer from prolonged exposure even to low As concentrations.

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Evaluation of techniques for sampling volatile arsenic on volcanoes

Cited by 14 publications

References 33 publications

The Pedosphere as a Sink, Source, and Record of Anthropogenic and Natural Arsenic Atmospheric Deposition

The Pedosphere as a Sink, Source, and Record of Anthropogenic and Natural Arsenic Atmospheric Deposition

Biovolatilization of Arsenic as Arsines from Seawater

Arsenic metabolism in technical biogas plants: possible consequences for resident microbiota and downstream units

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