By H. Schreier
Asbestos minerals have novel houses which lead them to hugely fascinating for commercial use. whereas the healthiness dangers of asbestos have lengthy been well-known and are good documented within the clinical literature, ecological and environmental examine concerning asbestos fibers has merely 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 booklet examines non-occupational publicity and environmental results of asbestos in terms of animal and plant progress within the usual setting. significant nutrient imbalances and extra concentrations of hint metals were pointed out as major motives for the bad 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 bearing on asbestos within the typical setting with the purpose of contributing to a greater knowing of the chemical features of asbestos-rich fabrics and their influence on plant growth.
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Extra resources for Asbestos in The Natural Environment
In order to improve the analytical accuracy between laboratories guidelines are still forthcoming (Cooney 1987) and, given the complexity of asbestos fiber analysis, the topic will remain highly controversial for many more years to come (Krantz 1987). 4 5 The working group on Asbestos and Cancer of the UICC (Union International Contre le Cancer) recommended in 1964 to prepare standard reference samples of the major commercial deposits of asbestos fibers. These included South African amosite and crocidolite, Finnish anthophylite, and Canadian and Rhodesian chrysotile.
1977, Hodgson 1986). Wadsley defects refer to problems in the sequence of shear planes. Unequal sequences of silica sheets that occur between crystallographic shear planes result in gains and losses of cations and OH groups. Suggestions have been made that the presence of aluminum in tetrahedral layers inhibits fiber formation but Whittaker (1979) also indicates that the conditions of crystal growth are very important in determining whether amphiboles develop in acicular or non-acicular form. Research by Jenkins (1987), Hutchison et 31 al.
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. The studies by Oliver & Murr (1977) in New Mexico, Hallenbeck et al. (1978) in Illinois and Millette et al. (1981b) in other parts of the USA found no increase in fiber content before or after flow through A/C pipes.
Asbestos in The Natural Environment by H. Schreier