Spectroscopic and Microscopic Characterization of Volcanic Ash from Puyehue-(Chile) Eruption: Preliminary Approach for the Application in the Arsenic Removal

Botto, I. L.; Canafoglia, María Elena; Gazzoli, Delia; González, María José

doi:10.1155/2013/254517

Cited by 23 publications

(18 citation statements)

References 20 publications

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“…These phases exhibited their main peaks at 2θ = 30° and 35°. They also presented crystal phases of quartz (PDF 79-1906), plagioclase (CaAl 2 Si 2 O 8 ) and pyroxene (Mg 2 Si 2 O 6 ) (PDF 89-1463, 85-1740, 88-2377), with their major intensity peaks located about 26.5°, 28° and 30° of 2θ [36,37].…”

Section: X-ray Diffractionmentioning

confidence: 99%

“…Those fractions with a particle size between #40-60 and #60-100 contain about 5% more Fe. This fact suggests the existence of mixed valence iron oxides or related phases (magnetitetype) containing Fe, Mg, Al, and Ti [36,37]. The K-10 and K-30 systems are commercial aluminosilicates based on natural montmorillonite with the general formula (Al 4 (Si 4 O 10 ) 2 (OH) 4 ).…”

Section: Scanning Electron Microscopy and Energy Dispersive Spectroscopymentioning

confidence: 99%

“…The surface area of the rest of the ashes was between 1 and 4 m 2 /g. In addition, the material presented meso-and macropores (50-500 Å according to IUPAC convention), thus indicating its low overall density [35][36][37][38]. Figure 3 shows the comparative FT-IR spectra of ashes and K systems in the frequency range of 4000 to 400 cm -1 .…”

Section: Textural Propertiesmentioning

confidence: 99%

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Volcanic ash as reusable catalyst in the green synthesis of 3H-1,5-benzodiazepines

Muñoz

Pasquale

Sathicq

et al. 2019

Green Processing and Synthesis

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The volcanic ash from the Andes mountain range (Puyehue-Cordon Caulle volcanic complex situated in western South America on the Argentinean-Chilean border) was used as heterogeneous acid catalyst in the suitable synthesis of 3H-1,5-benzodiazepines. The natural ashes were classified according to their particle size to generate the different catalytic materials. The catalysts were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), vibrational spectroscopies (FT-IR and Raman), and textural properties were determined by N2 adsorption (SBET). Potentiometric titration with n-butylamine was used to determine the acidic properties of the catalytic materials. Several 3H-1,5-benzodiazepines were obtained by reaction of o-phenylenediamine and substituted 1,3-diphenyl-1,3-propanedione in solvent-free conditions, giving good to excellent yields of a variety benzodiazepines. The method was carried out in environmentally friendly conditions and it was operationally simple. The volcanic ash resulted in a safe and recyclable catalyst.

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Section: X-ray Diffractionmentioning

confidence: 99%

Section: Scanning Electron Microscopy and Energy Dispersive Spectroscopymentioning

confidence: 99%

Section: Textural Propertiesmentioning

confidence: 99%

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Volcanic ash as reusable catalyst in the green synthesis of 3H-1,5-benzodiazepines

Muñoz

Pasquale

Sathicq

et al. 2019

Green Processing and Synthesis

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“…The CNEA (Comisión Nacional de Energía Atómica, 2011, http://cab.cnea.gov.ar/noticiasanteriores/erupcionCaulle2011/informeGeneralFinal.pdf) also observed the presence of pyroxenes and a very scarce amount of ilmenite. Micro‐Raman spectroscopy detected a complex mineralogical mixture dispersed in the glassy matrix, basically formed by alkali aluminosilicate, hematite, and magnetite [ Botto et al ., ]. Minor presence of gypsum (Figure c) and Fe (hydr)oxides was also identified by EDS mapping.…”

Section: Resultsmentioning

confidence: 91%

Soluble iron inputs to the Southern Ocean through recent andesitic to rhyolitic volcanic ash eruptions from the Patagonian Andes

Simonella

Palomeque

Croot

et al. 2015

Global Biogeochemical Cycles

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Patagonia, due to its geographic position and the dominance of westerly winds, is a key area that contributes to the supply of nutrients to the Southern Ocean, both through mineral dust and through the periodic deposits of volcanic ash. Here we evaluate the characteristics of Fe dissolved (into soluble and colloidal species) from volcanic ash for three recent southern Andes volcanic eruptions having contrasting features and chemical compositions. Contact between cloud waters (wet deposition) and end-members of andesitic (Hudson volcano) and rhyolitic (Chaitén volcano) materials was simulated. Results indicate higher Fe release and faster liberation rates in the andesitic material. Fe release during particle-seawater interaction (dry deposition) has higher rates in rhyolitic-type ashes. Rhyolitic ashes under acidic conditions release Fe in higher amounts and at a slower rate, while in those samples containing mostly glass shards, Fe release was lower and faster. The 2011 Puyehue eruption was observed by a dust monitoring station. Puyehue-type eruptions can contribute soluble Fe to the ocean via dry or wet deposition, nearly reaching the limit required for phytoplankton growth. In contrast, the input of Fe after processing by an acidic eruption plume could raise the amount of dissolved Fe in surface ocean waters several times, above the threshold required to initiate phytoplankton blooms. A single eruption like the Puyehue one represents more than half of the yearly Fe flux contributed by dust.

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“…On 4 June 2011 the Puyehue‐Cordón Caulle volcanic complex in Chile began to erupt, resulting in the largest eruption of the 21st century so far (Venzke, 2016). The ash composition was substantially different, and therefore spectroscopically different, from the 2010 eruption of Eyjafjallajökull (Gudmundsson et al , ; Botto et al , ). Figure (a) shows an ash RGB image from this eruption at 0700 UTC 7 June 2011, where the ash is mainly displayed in yellow, likely due to its high silica content, with some displayed in magenta to red.…”

Section: Examplesmentioning

confidence: 90%

Decision theory‐based detection of atmospheric natural hazards from satellite imagery using the example of volcanic ash

Western

Rougier

Watson

2018

Quart J Royal Meteoro Soc

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Atmospheric natural hazards pose a risk to people, aircraft and infrastructure. Automated algorithms can detect these hazards from satellite imagery so that the relevant advice can be issued. The transparency and adaptability of these automated algorithms is important to cater to the needs of the end user, who should be able to readily interpret the hazard warning. This means avoiding heuristic techniques. Decision theory is a statistical tool that transparently considers the risk of false positives and negatives when detecting the hazard. By assigning losses to incorrect actions, ownership of the hazard warning is shared between the scientists and risk managers. These losses are readily adaptable depending on the perceived threat of the hazard. This study demonstrates how decision theory can be applied to the detection of atmospheric natural hazards using the example of volcanic ash during an ongoing eruption. The only observations are the difference in brightness temperature between two channels on the SEVIRI sensor. We apply the method to two volcanic eruptions: the 2010 eruption of Eyjafjallajökull, Iceland, and the 2011 eruption of Puyehue-Cordón Caulle, Chile. The simple probabilistic method appears to work well and is able to distinguish volcanic ash from desert dust, which is a common false positive for volcanic ash. As is made clear, decision theory is a tool for decision support, providing transparency and adaptability, but it still requires careful input from scientists and risk managers. Effectively it provides a space where these groups of experts can meet and convert their shared understanding of a hazard into a choice of action.

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Spectroscopic and Microscopic Characterization of Volcanic Ash from Puyehue-(Chile) Eruption: Preliminary Approach for the Application in the Arsenic Removal

Cited by 23 publications

References 20 publications

Volcanic ash as reusable catalyst in the green synthesis of 3H-1,5-benzodiazepines

Volcanic ash as reusable catalyst in the green synthesis of 3H-1,5-benzodiazepines

Soluble iron inputs to the Southern Ocean through recent andesitic to rhyolitic volcanic ash eruptions from the Patagonian Andes

Decision theory‐based detection of atmospheric natural hazards from satellite imagery using the example of volcanic ash

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