Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"Chrysotile"”.
-
The dissolution rate of chrysotile
Chrysotile can be linked to three diseases: lung cancer, asbestosis, and mesothelioma. The duration and intensity of exposure along with fiber size appear to play an important role in the development of the diseases. Chrysotile is part of the serpentine group which has the general composition of …
-
Étude de la lixiviation acide de l'amiante chrysotile
… étudié la cinétique de lixiviation de l'amiante chrysotile en milieux acides dilués et concentrés dans le but de mieux comprendre les mécanismes mis en jeu. L'étude a porté sur l'effet de l'acide (taille, pKa), la force ionique et l'origine du chrysotile. Nous avons étudié quelques autres …
-
Functional and pathological responses of selected aquatic organisms to chrysotile asbestos
… juvenile Japanese Medaka (Oryzias latipes) to chrysotile asbestos were investigated in 96-hour to 91-day tests. Chrysotile significantly reduced siphoning activity and shell growth of adult clams and siphoning, shell growth, and weight gain of juveniles at 10⁵ fibers/liter during 30-day tests. …
-
Leached chrysotile asbestos : characterization, leaching mechanism and use in the synthesis of zeolites
… indexation of the X-ray diffraction pattern of chrysotile was proposed. This was followed by the use of techniques such as X-ray diffraction and bulk density measurements for the study of the mechanism of transformation of chrysotile to amorphous silica hemihydrate. In the second part, three …
-
ON THE USE OF ASBESTOS IN CENTRAL ASIAN COUNTRIES: FINDINGS IN POSTMORTEM LUNG SAMPLES, CHARACTERIZATION OF ASBESTOS-CONTAINING MATERIALS, ENVIRONMENTAL AND OCCUPATIONAL EXPOSURE. CASE STUDIES IN KYRGYZSTAN.
… environmental exposure, and “controlled use” of chrysotile in manufacturing. This thesis aims to develop insights into asbestos production in Central Asia by analysing the chemical composition of asbestos samples taken in Kyrgyzstan; measuring the environmental exposure present in Urban areas …
-
A case-control study of mesothelioma in South Africa
… the study. No case was documented with purely chrysotile exposure nor exposure to a putative non-asbestos cause of the tumour without some evidence of asbestos exposure. A minimum of 22 cases (18%) had exclusively environmental exposure, 20 were from the NW Cape (a crocidolite mining region). …
-
The effect of phyllosilicate mineralogy and surface charge on the rheology of mineral slurries
… namely muscovite, vermiculite and chrysotile in terms of their surface charge, mineralogical and resultant rheological properties. The thesis was initiated in order to gain a better understanding of the flow behaviour of these minerals within well-defined model mineral systems, with …
-
The evaluation of an organophosphate thermosetting resin for use in a high temperature resistant composite and a study of chemistry of ionomer cements
… studies. Post-cured resorcinol phosphate resin-chrysotile asbestos (30: 70) moulded bars retained 59.5% of their flexural strength after ageing at 523K for 1000 hr in air. Similar phenol-formaldehyde composite bars aged under identical conditions retained only 5.3% of their initial flexural …
-
Direct mixing of geothermal water and condensate into heated groundwater at Nesjavellir power station
… silicate minerals, specifically Antigorite, Chrysotile, Talc, and Enstatite. The modeling suggests that the supersaturation of these minerals in the presence of mixes containing condensate water would be either lower or comparable to that observed in 100% heated groundwater. By identifying …
-
Crocidolite dissolution in the presence of Fe chelators: implications for mineral-induced disease
… at least two orders of magnitude longer than a chrysotile fiber of the same size, and corresponds well with the fiber content observed in human lung tissue.
-
Raman spectroscopic characterisation of inorganic fibres and particles and their coverage by wetting agents.
… species such as amosite, anthophyllite, chrysotile, crocidolite and tremolite gave distinct spectra. There were no very distinct differences between the spectra of asbestos fibres and their non-fibrous forms except sometimes in the v(OH) stretching region or band width in the case of …
-
Geochemical Investigations of Respirable Particulate Matter
… considerably faster than quartz, but slower than chrysotile and olivine in the body. These data can be used to place constraints on the role of particle dissolution in the disease models associated with airborne respirable particulate matter. Secondly, the bioavailability of As and Cr was …