New PDF release: Asbestos in The Natural Environment

By H. Schreier

ISBN-10: 0080874967

ISBN-13: 9780080874968

ISBN-10: 0444880313

ISBN-13: 9780444880314

Asbestos minerals have novel homes which cause them to hugely fascinating for commercial use. whereas the wellbeing and fitness risks of asbestos have lengthy been well-known and are good documented within the scientific literature, ecological and environmental study regarding asbestos fibers has in basic terms been undertaken some time past 25 years and the numerous deleterious results of asbestos fabrics on soil and plant ecology has been less good publicised.

This publication examines non-occupational publicity and environmental results of asbestos in terms of animal and plant progress within the typical atmosphere. significant nutrient imbalances and extra concentrations of hint metals were pointed out as major factors for the negative 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 matters concerning asbestos within the traditional atmosphere with the purpose of contributing to a greater knowing of the chemical features of asbestos-rich fabrics and their impression on plant growth.

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Additional resources for Asbestos in The Natural Environment

Sample text

More recent estimates suggest that over 640,000 km of A/C pipes exist in the USA (Sullivan 1986) , and Some 320,000 km in the UK (Millette et al. 1981b). Many studies have been carried out to determine how many fibers are introduced into the water by corrosion of A/C pipes. This has led to considerable confusion because in some studies concentrations increased after the water was transported through the A/C pipe network while in other cases 49 the fiber concentrations decreased after transport.

Polycyclic aromatic hydrocarbon (benzo[a]pyrene) in asbestos has been of some interest because of its possible role as a carcinogen (Mossman 1983, Harvey et al. 1984). As shown by Gibbs (1971) organic constituents in chrysotile minerals are relatively small and can be the result of gas adsorption or contamination of packaging materials (Commins and Gibbs 1969). (1980) and Bonneau et al. (1986) have shown that both amphibole and chrysotile asbestos may have dual surface charge characteristics. The extremities of the fibers where the octahedral sheet emerges appear to have a weak positive charge while the lateral surfaces are negatively charged.

The non-combustibility of asbestos minerals and their capacity to resist heat have contributed to the wide use of asbestos as insulation material. The mineral structure of chrysotile can be maintained up to 500-600' C with the loss of small amounts of water. Near 700' C there is a general structural breakdown where chrysotile is converted to fosterite. Structural alterations occur in crocidolite below 400' C and in amosite above 400' C but at 700' C amphibole type structures are still intact (Le Bouffant 1980).

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Asbestos in The Natural Environment by H. Schreier

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