Download Asbestos in The Natural Environment by H. Schreier PDF

By H. Schreier

Asbestos minerals have novel homes which lead them to hugely fascinating for commercial use. whereas the healthiness risks of asbestos have lengthy been famous and are good documented within the scientific literature, ecological and environmental examine concerning asbestos fibers has basically been undertaken long ago 25 years and the numerous deleterious results of asbestos fabrics on soil and plant ecology has been less good publicised.

This ebook examines non-occupational publicity and environmental results of asbestos in relation to animal and plant progress within the typical setting. significant nutrient imbalances and extra concentrations of hint metals were pointed out as major motives for the terrible plant reaction. Given the complexity of the asbestos research and the level of the matter, this ebook makes an attempt to collect the multitude of topics touching on asbestos within the average atmosphere with the purpose of contributing to a greater knowing of the chemical features of asbestos-rich fabrics and their impact on plant growth.

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Much more is known about the chemistry of chrysotile asbestos than about amphibole asbestos. There are some chemical differences between the fibrous and nonfibrous serpentine minerals. Whittaker and Wicks (1970) have shown that the structure, conditions of formation, and type and amount of substitution and contamination are responsible for chemical differences. Antigorite has generally higher SiO,, lower MgO, and lower HZO+ values than chrysotile and lizardite and is usually formed under reducing conditions, while lizardite develops under oxidizing environments.

These asbestos sources made up the majority of commercially available asbestos and it was felt that detailed characterization of the fibers was needed given the variability inherent in asbestos samples in general. It was felt that such reference materials could do much to improve methodology and reproducibility of medical and biological tests involving asbestos. These reference samples have been described by Timbrell et al. (1968) and their chemical and physical characteristics have been elucidated by Timbrell (1969).

The physical properties of heat resistance, high tensile strength, and noncombustibility, and the selective chemical resistance to acid and sea-water have made these minerals exceptionally useful to man. In contrast, the physical properties also pose a most serious threat to human health, and the combination of physical and chemical composition make asbestos rich soils an undesirable environment for plant growth. The physical, chemical, and physio-chemical properties of asbestos are of major significance in the environment.

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