Chrysotile Research Papers - Academia.edu (original) (raw)

Top Papers
Most Cited Papers
Most Downloaded Papers
Newest Papers
People
- by
- •
- Cancer, Public Health, Risk assessment, Workplace
- by Yildirim Dilek
- •
- Peridotite, Temperature, Mantle, Chrysotile
- by Sean Kohles
- •
- Causality, Automobiles, Humans, Industry

A suspension of chrysotile asbestos fibres in aqueous 0.5 M oxalic acid was subjected to power ultrasound with the aim to disrupt and detoxify the mineral by the leaching action of oxalic acid on its structural cations acting... more

- by Francesco Turci and +2
- •
- Chemistry, Polymorphism, Mass Spectrometry, Water Treatment
- by Dick Heederik and +1
- •
- Research Design, Risk assessment, Stratification, Lung Cancer
- by Sean Kohles
- •
- Causality, Automobiles, Humans, Industry
- by James Phillips
- •
- Confocal Microscopy, Automobiles, Asbestos, Animals
- by Maria Isabel Burgos Fonseca
- •
- Engineering, Thermodynamics, Enthalpy, Physical sciences
- by Giulio Sancini
- •
- Chemistry, Environmental Health, Health, Fluid Dynamics
- by Richard Wirth
- •
- Geology, Geochemistry, Mineralogy, Chrysotile
- by Maria Gardennia Fonseca
- •
- Engineering, Adsorption, Copper, Silica
- by Gilson Manfio
- •
- Kinetics, Scanning Electron Microscopy, Molecular, Chrysotile
- by Roberto Compagnoni and +1
- •
- Transmission Electron Microscopy, Mining, Italy, Identification

This study describes the formation of Fe-doped chrysotile fibers with partial and total substitution of Mg by Fe. Syntheses were carried out with various starting mixtures (oxides, pure synthetic forsterite) in an externally heated pressure vessel in controlled hydrothermal conditions: temperature, 270 - 400 °C; pressure, 0.5 - 2 kbar; duration of treatment 160 - 480 hours. Pure synthetic forsterite was prepared by the flux growth technique. The starting material and run products were characterized by X-ray powder diffraction (XRPD), scanning and transmission electron microscopies combined with energy-dispersive spectrometry (SEM-EDS and TEM-EDS), differential scanning calorimetry (DSC) and thermogravimetry (TG). Variations observed in abundance and size of Fe-doped chrysotile fibers were attributed to different experimental conditions for their synthesis. However, morphological shape turned out to depend on the starting mixtures used. Since natural samples are often difficult to obtain in a sufficiently pure state, these synthetic and well-characterized Fe-doped chrysotile fibers can be used for better understanding of the mechanisms involved in asbestos toxicity, as well as of the role of Fe in diseases induced by asbestos phases. These synthetic Fe-doped chrysotile fibers, together with non-toxicity testing, may also have potential for exploitation in industrial fields.

- by Domenico Miriello
- •
- Synthesis of Minerals, Chrysotile
- by Giulio Sancini
- •
- Chemistry, Environmental Health, Health, Fluid Dynamics

The relationship between mesothelioma and exposure to asbestos is well established. As a result, the use of asbestos in buildings, construction sites, and mines, as well as the implications of disease for the workers has received considerable attention. However, asbestos was also used in household equipment and consumer products, including hairdryers. To examine one case of peritoneal mesothelioma in a hairdresser and review the relevant literature on asbestos exposure from hairdryers. The subject's medical and occupational records were obtained and reviewed and a physical examination was performed. The results indicate that the subject developed peritoneal mesothelioma from her occupational exposure to asbestos containing hairdryers in accordance with the literature. Hairdryers are possible sources of asbestos exposure in patients with mesothelioma, and the asbestos exposure risk is higher for those who use hairdryers occupationally.

- by James dahlgren
- •
- Risk assessment, Medicine, Humans, Asbestos
- by R. Lemen
- •
- Epidemiology, Risk, Humans, Toxicity

The use of homogeneous hydrolysis of cation by the decomposition of urea can be used to synthesis 2:1 clay minerals containing cobalt. However, changing the system to a chrysotile (1:1 clay mineral) composition results in the formation of a mixture of phases instead of Co-chrysotile. This in contrast to the nickel system where in both cases (starting from a 1:1 and 2:1 clay composition) pecoraite, a 1:1 clay mineral, was formed [3]. This can be explained by the difference in the chemical behaviour of nickel and cobalt during hydrolysis, where nickel remains in the same valence state, while the valence state of cobalt can change.

- by J. THEO KLOPROGGE
- •
- Engineering, Materials, Clay Minerals, Inorganic synthesis

- by Stefano Mantegna and +1
- •
- Chemistry, Polymorphism, Mass Spectrometry, Water Treatment
- by E. Barrese
- •
- Synthesis of Minerals, Chrysotile, Biochemistry and cell biology
- by Elena Belluso
- •
- Synthesis of Minerals, Chrysotile, Biochemistry and cell biology
- by João Santos
- •
- Chemical Engineering, Density, Polymerization, Adsorption
- by Dimitris Kalderis
- •
- Engineering, Environmental Science, Production, Irrigation
- by Michael Hochella
- •
- Engineering, Advanced Functional Materials, Physical sciences, Chrysotile
- by Adriano Fachini
- •
- Chemistry, Wastewater Treatment, Clay Minerals, Multidisciplinary
- by Benjamin Malvoisin
- •
- Kinetics, Modeling, Fracture, Multidisciplinary
- by Gill Nelson
- •
- Mining, Asbestosis, South Africa, Humans
- by Murray Finkelstein
- •
- Epidemiology, Cancer, Risk assessment, Quebec
- by Nubia Munoz
- •
- Epidemiology, Cancer, Dialysis, China
- by Nubia Munoz
- •
- Epidemiology, Cancer, Dialysis, China
- by R. Lemen
- •
- Global Health, Cancer, Environmental Health, International Cooperation
- by Jill Murray
- •
- Mining, Asbestosis, South Africa, Humans

The Hasangazi chromite pit is an abandoned mine located to the east of the town of Pülümür (Tunceli, Turkey). The surface water that circulates in the pit flows into the Pülümür stream via the Turnadere creek. The quality of the surface water and soil from the region is important regarding the ecosystem in the Tunceli area. The open pit operations in the chromite deposits may be the cause of toxic element enrichments. To understand the effects of such pits, samples from the sediments, soil, waste material, and surface water were collected from the Hasangazi pit and its surrounding area. Samples were mineralogi-cally and geochemically analyzed by XRD, ICP-OES, and ICP-MS methods. Mineralogical analyses showed the presence of chrysotile and plagioclase in the sediment and soil samples. These samples are also enriched in toxic elements, e.g., Cr, Ni, and Co. In particular, the Cr and Ni concentrations exceed the limits of soil pollution regulation of Turkey and the US Environmental Protection Agency. Overall the Cr, Ni, and chrysotile contents demonstrate the impact of the abandoned pit and the ultramafic rocks. Moreover, the surface water samples in the dry season have Zn concentrations above the toxic levels that may have been derived from the volcanic rocks. Environmental remediation precautions should immediately be taken around this inactive pit.

- by Okay Çimen
- •
- Heavy metals, Soil Geochemistry, Chrysotile
- by Matteo Leoni
- •
- Chemistry, Chrysotile, CHEMICAL SCIENCES, X ray diffraction
- by Michele Lazzeri
- •
- Modeling, Equations of State, Multidisciplinary, Elasticity
- by Flaysner Magayver Portela
- •
- Engineering, Biodiesel, Chrysotile, CHEMICAL SCIENCES

Objectives: To evaluate the biodurability of balangeroite, present as contaminant of chrysotile asbestos in the Balangero mine, in order to have indication whether it might have been a confounding factor in the association of the... more

- by Francesco Turci and +2
- •
- Transmission Electron Microscopy, Mining, Italy, Identification

Chrysotile fibers were synthesized from glass in hydrothermal conditions. The starting materials were first held at 1650°C and then rapidly quenched down to room temperature. The resulting glass, after the addition of mineralizing agents, was hydrothermically altered in the following conditions: temperature 300°C–400°C; pressure 100–200 MPa; time 48–480 h. X-ray powder diffraction, scanning and transmission electron microscopy were used to examine/study the starting materials and products. Cylindrical fiber morphology was prevalent, but proto-chrysotile was also detected, not entirely showing well-defined crystallinity, as revealed by electron diffraction patterns of selected areas. The mineralizing agent and chemical composition of the glass play an important role in the yield of chrysotile fibers. The effect of growth parameters on the size and abundance of chrysotile fibers is also discussed, in the light of possible recrystallization of glass obtained by thermal treatment of chrysotile-asbestos-containing materials.

- by Domenico Miriello
- •
- Minerals Engineering, Inorganic synthesis, Chrysotile