Fluorides in the Environment - download pdf or read online

Environmental Studies

By L H Weinstein, A Davison

Fluoride pollutants is an issue in all industrialized international locations. the subject of fluorides in medication and agriculture, and fluoridation of public water offers is person who has attracted a lot controversy. This publication goals to study the learn findings, and supply a entire reference at the results of fluorides on vegetation and animals. additionally it is info on engaging in box surveys, setting up air caliber standards and criteria, and the issues linked to fluoride research in air, water, soil and plants.

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It also explains the increase in shoot fluoride when the concentration is increased in culture media (Fig. 7). If this pathway does operate, it suggests that the background fluoride content of leaves is related to water use and that it may be higher in species with a highly branched root system. Interest in fluoride–aluminium complexes began in the 1970s because of concern about aluminium toxicity and also because of so-called fluoride accumulators. These are species that contain much higher concentrations of fluoride than other species, even when they are growing on soils with ‘normal’ levels of fluoride.

One sample of greenhousegrown tea contained 1530 mg/kg. Cholak (1959) reported that the concentration in tea ranged from 8 to 400 mg/kg, and Davison (1983) reported that four varieties of tea contained between 139 and 233 mg/kg. Tea also accumulates aluminium (Chenery, 1955), so Davison (1983) analysed a number of species that were known to be aluminium accumulators (Chenery, 1948a,b) to see if they also accumulated fluoride. 4). 4. Fluoride concentrations in a selection of fluoride-accumulating species (from Davison, 1983).

1942) considered that fixation was due to reaction with calcium because it was ‘the dominant exchangeable base and main precipitative ion’. This idea was supported by many studies in which lime was applied. However, it was also realized that calcium is not the sole agent responsible for fixation, because MacIntire (1957) noted that retention of fluoride added to acid soils was proportional to their Al2O3 content. Later, Omueti and Jones (1977b) showed that the adsorption capacity of Illinois soils was related to pH, clay, organic matter and amorphous aluminium compounds.

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