Fluoride retention in highly leached disturbed soils
Murray, F. (1984) Fluoride retention in highly leached disturbed soils. Environmental Pollution Series B, Chemical and Physical, 7 (2). pp. 83-95.
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The fluoride retention capacity of highly leached disturbed soil, possessing little soil structure, was examined by applying fluoride to soil cores in cylinders and subjecting them to leaching for 12 months. Even at very high fluoride application rates only 2·6 to 4·6% of the fluoride applied was leached as water-soluble fluoride. The pH of the eluate increased with increasing mass of fluoride applied to the columns, probably as a result of fluoride adsorption by exchange with OH− from soil metal hydroxides.
During the course of the experiment the water-soluble fluoride content of the soils decreased due to an enhancement of the firmness of the link between the surfaces of soil particles and fluoride, which occurs with time. Both water-soluble and total fluoride concentrations were found to be greatest at a depth of 0·7 to 1·4 m. It was concluded that soil iron and aluminium compounds may be the major fluoride retention factors in this soil, although other soil physical and chemical factors may also be involved. These reconstituted soils possess a very high capacity to retain fluoride despite their high permeability and relative absence of structure.
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|Copyright:||© 1984 Elsevier Ltd.|
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