Surface alteration mechanism and topochemistry of iron in tremolite asbestos: A step toward understanding the potential hazard of amphibole asbestos

Pacella, Alessandro; Fantauzzi, Marzia; Turci, Francesco; Cremisini, Carlo; Montereali, Maria Rita; Nardi, Elisa; Atzei, Davide; Rossi, Antonella; Andreozzi, Giovanni B.

doi:10.1016/j.chemgeo.2015.03.028

Cited by 26 publications

(37 citation statements)

References 38 publications

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“…The curve fitted Fe2p 3/2 signal of sample n. 22 (Fig. 9) shows the presence of three components that, according to literature [18,33,34,35,36,37,38,39] (Fig. 10).…”

Section: Yellow and Light Green Glassessupporting

confidence: 58%

Characterisation of Roman and Byzantine glasses from the surroundings of Thugga (Tunisia): Raw materials and colours

Fermo

Andreoli

Bonizzoni

et al. 2016

Microchemical Journal

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Roman and Byzantine glass shards collected during excavation campaigns around the ancient city of Thugga in northern Tunisia have been characterised by means of various analytical techniques. Portable X-ray Fluorescence (pXRF) was used to determine the glass matrix elemental composition and to identify the elements responsible for the colour. Fibre optic reflectance spectroscopy (FORS) was employed to investigate the chemical nature, the oxidation state and the coordination of the chromophores. X-ray photoelectron spectroscopy (XPS) was here exploited for characterising the outermost layers of the glasses. Elemental analyses by pXRF pointed out that Si, Fe, Al, Ca, K, Rb, Sr, Na and Mg are the main elements present in the glasses. The chromophores responsible for the different shades are Fe for the green shades, Cu and Co for the blue ones, Mn, also used as discolouring agent, for the colourless samples. In relation to the raw materials used for glass production, the comparison with control groups of samples from Northern Tunisia suggests a common provenance of sands

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“…The curve fitted Fe2p 3/2 signal of sample n. 22 (Fig. 9) shows the presence of three components that, according to literature [18,33,34,35,36,37,38,39] (Fig. 10).…”

Section: Yellow and Light Green Glassessupporting

confidence: 58%

Characterisation of Roman and Byzantine glasses from the surroundings of Thugga (Tunisia): Raw materials and colours

Fermo

Andreoli

Bonizzoni

et al. 2016

Microchemical Journal

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“…Amphiboles are more stable than serpentine asbestos in acidic solutions 15 and are less susceptible to chemical modifications following interaction with body fluids 16 . Nevertheless, previous researches showed that a few hour leaching of crocidolite and tremolite with an oxidative buffered medium caused a significant modification of the Fe 2+ /Fe 3+ ratio in the surface layers and the occurrence of newly-formed iron-rich phases 17 , 18 . These studies highlighted a different behaviour of crocidolite with respect to tremolite in both dissolution and iron speciation kinetics.…”

Section: Introductionmentioning

confidence: 96%

“…To understand how these complex surface dynamics modulate the overall surface reactivity of asbestos and determine the nature of the molecular interaction between asbestos fibres and biological molecules, this work investigates i) the surface reactivity of crocidolite and tremolite asbestos, measured as the ability to catalyse free radical release, and ii) how this parameter is affected by the surface alterations induced by an oxidative leaching. Crocidolite and tremolite fibres were incubated in a H 2 O 2 solution buffered at pH 7.4 for different time points, from 1 day to 1 month, under the same conditions used in the previous studies 17 , 18 . Far from mimicking the cellular environment, such conditions have been chosen to promote the dissolution dynamics of asbestos in a reasonable experimental time.…”

Section: Introductionmentioning

confidence: 99%

Surface reactivity of amphibole asbestos: a comparison between crocidolite and tremolite

Andreozzi

Pacella

Corazzari

et al. 2017

Sci Rep

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Among asbestos minerals, fibrous riebeckite (crocidolite) and tremolite share the amphibole structure but largely differ in terms of their iron content and oxidation state. In asbestos toxicology, iron-generated free radicals are largely held as one of the causes of asbestos malignant effect. With the aim of clarifying i) the relationship between Fe occurrence and asbestos surface reactivity, and ii) how free-radical generation is modulated by surface modifications of the minerals, UICC crocidolite and fibrous tremolite from Maryland were leached from 1 day to 1 month in an oxidative medium buffered at pH 7.4 to induce redox alterations and surface rearrangements that may occur in body fluids. Structural and chemical modifications and free radical generation were monitored by HR-TEM/EDS and spin trapping/EPR spectroscopy, respectively. Free radical yield resulted to be dependent on few specific Fe2+ and Fe3+ surface sites rather than total Fe content. The evolution of reactivity with time highlighted that low-coordinated Fe ions primarily contribute to the overall reactivity of the fibre. Current findings contribute to explain the causes of the severe asbestos-induced oxidative stress at molecular level also for iron-poor amphiboles, and demonstrate that asbestos have a sustained surface radical activity even when highly altered by oxidative leaching.

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“…The fibrous form of the amphibole tremolite is considered to be of aggravated risk due to its raised bio-persistence compared to chrysotile, which exhibits enhanced bio-solubility in direct comparison. [20,21] While considering these facts, a potential decomposition of natural asbestos could be a significant side effect of the carbonation process. As stated by Ryu et al, the direct aqueous carbonation of tremolite fibers, forming reaction products as calcite, and the triggered morphological modification to a rhombohedral habitus may reduce or even eliminate the hazardous character of tremolite [22].…”

Section: Examination Of the Present Mineral Phasesmentioning

confidence: 99%

Geological Mapping and Characterization of Possible Primary Input Materials for the Mineral Sequestration of Carbon Dioxide in Europe

et al. 2019

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This work investigates the possible mineral input materials for the process of mineral sequestration through the carbonation of magnesium or calcium silicates under high pressure and high temperatures in an autoclave. The choice of input materials that are covered by this study represents more than 50% of the global peridotite production. Reaction products are amorphous silica and magnesite or calcite, respectively. Potential sources of magnesium silicate containing materials in Europe have been investigated in regards to their availability and capability for the process and their harmlessness concerning asbestos content. Therefore, characterization by X-ray fluorescence (XRF), X-ray diffraction (XRD), and QEMSCAN® was performed to gather information before the selection of specific material for the mineral sequestration. The objective of the following carbonation is the storage of a maximum amount of CO2 and the utilization of products as pozzolanic material or as fillers for the cement industry, which substantially contributes to anthropogenic CO2 emissions. The characterization of the potential mineral resources for mineral sequestration in Europe with a focus on the forsterite content led to a selection of specific input materials for the carbonation tests. The mineralogical analysis of an Italian olivine sample before and after the carbonation process states the reasons for the performed evaluation. The given data serves as an example of the input material suitability of all the collected mineral samples. Additionally, the possible conversion of natural asbestos occurring in minerals as a side effect of the carbonation process is taken into consideration.

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Surface alteration mechanism and topochemistry of iron in tremolite asbestos: A step toward understanding the potential hazard of amphibole asbestos

Cited by 26 publications

References 38 publications

Characterisation of Roman and Byzantine glasses from the surroundings of Thugga (Tunisia): Raw materials and colours

Characterisation of Roman and Byzantine glasses from the surroundings of Thugga (Tunisia): Raw materials and colours

Surface reactivity of amphibole asbestos: a comparison between crocidolite and tremolite

Geological Mapping and Characterization of Possible Primary Input Materials for the Mineral Sequestration of Carbon Dioxide in Europe

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