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380 results on '"Arletti, Rossella"'

18. Identification and quantification protocol of hazardous-metal bearing minerals: Ni in serpentinite rocks from Valmalenco (Sondrio, Central Alps, Northern Italy)

Author

Fantini, R, Sisti, M, Arletti, R, Malferrari, D, Gamberini, M, Zapparoli, M, Da Val, F, Cavallo, A, Gualtieri, A, Fantini, Riccardo, Sisti, Mattia, Arletti, Rossella, Malferrari, Daniele, Gamberini, Maria Cristina, Zapparoli, Mauro, Da Val, Filippo, Cavallo, Alessandro, Gualtieri, Alessandro Francesco, Fantini, R, Sisti, M, Arletti, R, Malferrari, D, Gamberini, M, Zapparoli, M, Da Val, F, Cavallo, A, Gualtieri, A, Fantini, Riccardo, Sisti, Mattia, Arletti, Rossella, Malferrari, Daniele, Gamberini, Maria Cristina, Zapparoli, Mauro, Da Val, Filippo, Cavallo, Alessandro, and Gualtieri, Alessandro Francesco

Abstract

Serpentinite is a widespread rock type used worldwide as building material. Heavy metals like Ni in both the serpentinite products and serpentinite mining wastes pose potential environmental and health issues. This work devises an analytical protocol to identify and quantify the Ni speciation in the mineralogical matrix, through: i) bulk Ni quantification; ii) quantitative mineralogical and chemical analysis of each Ni-rich mineral; iii) comparison of bulk analysis results with the sum of each contribution from the Ni-rich minerals. As case study, two commercial serpentinites “Verde Giada” (VG) and “Verde Vittoria” (VV) from Valmalenco (Northern Italy) were analysed by ICP-MS, XRPD, TGA–MSEGA, SEM, TEM, EPMA, and micro-Raman spectroscopy. The bulk Ni content is 1500–1750 mg/kg and 1390–1620 mg/kg for VG and VV, respectively. The major minerals from XRPD and EPMA (antigorite, olivine, pyroxene, magnetite, brucite) account for 1094 and 1291 mg/kg of Ni for VG and VV, respectively. SEM/TEM and EPMA highlighted the presence of minor chrysotile, pentlandite, heazlewoodite, awaruite, rising the computed Ni to 1924 and 1761 mg/kg for VG and VV, in good agreement with bulk ICP-MS. This protocol provides robust results and can thus enhance the exposure assessment of Ni and eventually other naturally occurring hazardous metals.

Published
2024

19. When detection and quantification of mineral fibres in natural raw materials are at their limit – the case of a clay from the Gomsiqe–Puka mining area (Albania).

Author

Gualtieri, Alessandro F., Marchetti Dori, Simona, Malferrari, Daniele, Giovanardi, Tommaso, Fantini, Riccardo, Colombo, Francesco, Sisti, Mattia, Arletti, Rossella, Gamberini, Maria Cristina, Braschi, Eleonora, Orlando, Andrea, and Mugnaioli, Enrico

Subjects
ELECTRON probe microanalysis, RAW materials, NATURAL fibers, TRANSMISSION electron microscopy, FREE enterprise, ASBESTOS
Abstract

In today's global market, the movement of raw materials and goods in the free global market can lead to unintended consequences. One significant concern is the potential presence of contaminants and carcinogens, particularly when products originate from regions with less strict regulations and enforcement. This issue is particularly pertinent in the natural raw materials utilized in the global building materials market, where contamination by asbestos minerals can occur. Therefore, the screening of natural raw materials for asbestos content is crucial to mitigate the risk of exposure to carcinogens for both workers and the general public. In this study, we examine a challenging case involving a smectite–kaolinite clay from Gomsiqe–Puka, Albania, possibly containing mineral fibres. Detection and quantification of asbestos in this material push the boundaries of current experimental methods. Using transmission electron microscopy (TEM), micro-Raman spectroscopy, and electron probe microanalysis (EPMA), we identified the presence of asbestos tremolite, along with a rare fibrous variety of diopside. EPMA data allowed the advancement of some speculations on the origin of the observed tremolites, showing that Al-rich tremolites are typical of oceanic settings and Al-poor tremolites are more similar to continental tremolites. We also investigated the impact of milling on the detection and quantification of mineral fibres, testing different milling times. This investigation is crucial as it can influence the classification of the raw material as asbestos-containing material or not. Our findings indicate that tremolite, cleavage fragments, and elongated particles break down into smaller World Health Organization (WHO) fibres with increasing milling times (1–5 min). However, prolonged milling (10 min) leads to overgrinding, resulting in a decrease in the number of counted WHO fibres with a length exceeding 5 µ m. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Characterization and potential toxicity of asbestiform erionite from Gawler Downs, New Zealand.

Author

Patel, Janki Prakash, Brook, Martin, Kah, Melanie, Hamilton, Ayrton, Gamberini, Maria Cristina, Zoboli, Carlotta, Mugnaioli, Enrico, Malferrari, Daniele, Fantini, Riccardo, Arletti, Rossella, and Gualtieri, Alessandro F.

Subjects
ELECTRON probe microanalysis, X-ray powder diffraction, RIETVELD refinement, HYDROTHERMAL alteration, VOLCANIC ash, tuff, etc., ASBESTOS
Abstract

Erionite is the name for a zeolite mineral series originating from diagenesis or hydrothermal alteration of volcanic rocks. The particular erionite "species" is based on the dominant extra-framework cation, erionite-Ca, erionite-K, or erionite Na. Irrespective of the species, erionite can display a fibrous/ asbestiform morphology and has been linked with cases of malignant mesothelioma, a disease typically associated with asbestos exposure. Characterization of new discoveries of erionite is therefore important to assess any potential exposure hazards. This study describes a new asbestiform erionite from vesicles within the Upper Cretaceous Mt. Somers Volcanics Group (MSVG), Canterbury, New Zealand. The erionite is within the Hinds River Dacite, the youngest unit within the MSVG at Gawler Downs, ~100 km west of Christchurch, in the foothills of the Southern Alps. A multi-analytical approach was taken to analyze the sample which included micro-Raman spectroscopy, thermogravimetric analysis, electron microscopy, electron microprobe analysis, and X-ray powder diffraction with the Rietveld method. Results confirmed the mineral as fibrous erionite-K. The chemical composition of the mineral is unique due to the presence of higher levels of Mg. While Fe was also identified, this was due to smectite flakes occurring on the surface of the erionite fibers. According to the World Health Organization (WHO) respirable mineral fiber definition, where length ≥5 μm. width ≤3 μm, and aspect ratio (L/w) ≥3:1, the Gawler Downs erionite fibers are respirable, while the fibers themselves exceed respirable thickness. In addition to morphology. a value for the potential toxicity model was computed to be 2.28 for the Gawler Downs erionite. This is similar to those of other carcinogenic erionites from Karain. Turkey (2.33). and Nevada. U.S.A. (2.28). Taken together. results indicate Gawler Downs erionite represents an environmental hazard. Nevertheless. further investigation is required to determine potential environmental exposure pathways by which erionite may become airborne and assess the actual environmental risk in the Gawler Downs area. [ABSTRACT FROM AUTHOR]

Published
2024
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40. The Beneficial Role of Nano-Sized Fe3o4 Entrapped in Ultra-Stable Y Zeolite for the Complete Mineralization of Phenol by Heterogeneous Photo-Fenton Under Solar Light

Author

Tammaro, Olimpia, primary, Morante, Nicola, additional, Marocco, Antonello, additional, Fontana, Marco, additional, Castellino, Micaela, additional, Barrera, Gabriele, additional, Allia, Paolo, additional, Tiberto, Paola, additional, Arletti, Rossella, additional, Fantini, Riccardo, additional, Vaiano, Vincenzo, additional, Esposito, Serena, additional, Sannino, Diana, additional, and pansini, Michele, additional

Published
2023
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