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Physiologic conditions affect toxicity of ingested industrial fluoride
1Department of Chemistry, University of California, San Diego, La Jolla, CA 92037, USA. rsauerheber@palomar.edu
Journal of Environmental and Public Health
|July 11, 2013
Summary
Fluoride toxicity is linked to calcium levels, with high fluoride concentrations depleting blood calcium. Environmental factors and co-present cations significantly influence fluoride
Area of Science:
- Environmental Chemistry
- Toxicology
- Biochemistry
Background:
- Fluoride ion's interaction with calcium ions is crucial for understanding its toxicity.
- Environmental conditions and the presence of other cations modulate fluoride's effects.
- Distinction between naturally occurring calcium fluoride and industrial fluorides is important for toxicity assessment.
Purpose of the Study:
- To investigate the impact of calcium ion and pH on aqueous fluoride concentrations.
- To theoretically compute and directly measure fluoride ion concentrations under various conditions.
- To elucidate the mechanisms of fluoride toxicity, particularly its interaction with calcium.
Main Methods:
- Solubility calculations were performed to predict fluoride-calcium interactions.
- Direct measurements of free fluoride ion concentrations were conducted.
- Theoretical computations were used to analyze fluoride behavior across a range of pH values.
Main Results:
- Solubility calculations revealed that lethal blood fluoride levels would reduce calcium below normal levels.
- Fluoride toxicity, both acute and chronic, involves alterations in calcium ion activity.
- Fluoride's toxicity is contingent on environmental conditions and the presence of specific cations.
Conclusions:
- Fluoride toxicity is significantly influenced by calcium ion availability and environmental factors.
- Industrial fluorides pose a greater risk than natural calcium fluoride due to solubility and toxicity differences.
- The study questions the safety of widespread water fluoridation policies based on observed fluoride-calcium interactions and potential health impacts.
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