Fluoride: A review of its fate, bioavailability, and risks of fluorosis in grazed‐pasture systems in New Zealand

Cronin, Shane J.; Manoharan, V.; Hedley, M. J.; Loganathan, P.

doi:10.1080/00288233.2000.9513430

Cited by 206 publications

(135 citation statements)

References 107 publications

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“…Mineralized in utero, the mandibular M1 is established in 4-mo-old calves. There appears to be some barrier to fluoride transport in utero as well as during lactation (Kierdorf et al, 1996a;Cronin et al, 2000;Richter et al, 2011). As expected, calves showed unaffected M1; solely the deciduous incisive teeth showed substantial wear, given that permanent incisors would not emerge for another 6-10 mo.…”

Section: Effects On Red Deersupporting

confidence: 60%

“…Remarkably, Taves (1980) cautioned that it is unknown whether water-soluble fluoride is the only biologically important form. Furthermore, a large proportion of total tephra fluoride was suggested to be soluble in digestive systems of grazing animals that ingest tephra via grooming (Walton, 1988), via large amounts of ingested soil, and via particles adhering to low-growing forage (particularly characteristic of rangelands), which results in passive absorption (Gregory and Neall, 1996;Cronin et al, 2000Cronin et al, , 2003. Other avenues of fluoride ingestion depend on water and forage concentrations determined by precipitation patterns and soil conditions, and thus vary among locations (Shupe et al, 1984).…”

Section: Future Perspectivesmentioning

confidence: 99%

“…Winds deposited layers of tephra 5 cm thick up to 240 km distant, but it also reached Buenos Aires, 1,400 km away (Wilson et al, 2012). Volcanic eruptions may emit toxic levels of fluoride, impacting animals in the surroundings (Cronin et al, 2000(Cronin et al, , 2003, yet fluorosis in wildlife raised concerns only as recently as 1967, principally regarding pollution or use of fertilizers (Kierdorf et al, 1996b;Richter et al, 2010). A recent local example was the Lonquimay volcano eruption (1988,200 km north of PCCVE), where fluorosis in livestock occurred within weeks (Araya et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Severe Dental Fluorosis in Juvenile Deer Linked to a Recent Volcanic Eruption in Patagonia

Flueck

Smith-Flueck²

2013

Journal of Wildlife Diseases

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ABSTRACT:The Puyehue-Cordon Caulle volcanic eruption deposited large amounts of tephra (ashes) on about 36 million ha of Argentina in June of 2011. Tephra was considered chemically innoxious based on water leachates, surface water fluoride levels were determined to be safe, and livestock losses were attributable to inanition and excessive tooth wear. To evaluate effects on wild ungulates, we sampled wild red deer (Cervus elaphus) at 100 km from the volcano in SeptemberNovember 2012. We show that tephra caused severe dental fluorosis, with bone fluoride levels up to 5,175 ppm. Among subadults, tephra caused pathologic development of newly emerging teeth typical of fluorosis, including enamel hypoplasia, breakages, pitting, mottling, and extremely rapid ablation of entire crowns down to underlying pulp cavities. The loss of teeth functionality affected physical condition, and none of the subadults was able to conceive. Susceptibility to fluorosis among these herbivores likely resides in ruminant food processing: 1) mastication and tephra size reduction, 2) thorough and repeated mixing with alkaline saliva, 3) water-soluble extraction in the rumen, and 4) extraction in the acidic abomasum. Although initial analyses of water and tephra were interpreted not to present a concern, ruminants as a major component of this ecosystem are shown to be highly susceptible to fluorosis, with average bone level increasing over 38-fold during the first 15.5 mo of exposure to tephra. This is the first report of fluorosis in wild ungulates from a volcanic eruption. The described impact will reverberate through several aspects of the ecology of the deer, including effects on population dynamics, morbidity, predation susceptibility, and other components of the ecosystem such as scavenger and plant communities. We anticipate further impact on livestock production systems, yet until now, existence of fluorosis had not been recognized.

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Section: Effects On Red Deersupporting

confidence: 60%

Section: Future Perspectivesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Severe Dental Fluorosis in Juvenile Deer Linked to a Recent Volcanic Eruption in Patagonia

Flueck

Smith-Flueck²

2013

Journal of Wildlife Diseases

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“…The inverse correlation between F -and Ca 2? are often observed in the saturation state (Ozsvath 2009) because the maximum concentration of fluorine is generally restricted by CaF 2 (Apambire et al 1997;Cronin et al 2000;Saxena and Ahmed 2003).…”

Section: Fluorine Contents Of Sedimentary Coresmentioning

confidence: 99%

The levels of fluorine in the sediments of the aquifer and their significance for fluorosis in coastal region of Laizhou Bay, China

Chen

Song

et al. 2013

Environ Earth Sci

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The levels of fluorine in sediment cores obtained from Changyi County (PZ core) and Laizhou County (TS core) are used to discuss the fluorine sources in groundwater and its enrichment dynamics. The sediments in the aquifer are mainly constituted of granite gravels. The levels of fluorine in the PZ and TS cores range from 130 to 468 mg/kg, 139-528 mg/kg, with average values of 324, 348 mg/kg, respectively, which show relatively lower levels than the national average of fluorine in the soil or sediment. Thus, the fluorosis in this area should not be attributed to the levels of fluorine in sediments. The average fluorine concentrations in the aquifer from top to bottom are 154, 139, 200, 222 mg/kg for the TS core, and 154, 130, 266, 272 mg/kg for the PZ core, respectively, which are the lowest of the cores and extremely lower levels than the fresh granites. Such a fact indicates that a vast amount of fluorine has been leached into the groundwater. Moreover, the fluorine leachability is estimated to be approximately 70 %, although the previous documents showed fluorine contents of the granite surrounding Laizhou Bay were almost equal to or even lower than the average levels of fluorine in fresh granites. Meanwhile, a simulation experiment also reveals that fluorine release from rocks increases with the addition of seawater and brine water.Therefore, the seawater intrusion may potentially enhance the fluorine leachability, and should be an important dynamic of fluorine enrichment.

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“…Fluorine in the form hydrofluoric acid (HF), silicon tetrafluoride (SiF 4 ), and fluoride derivatives can also be released from industrial sites associated with aluminium or phosphate processing, as well as steel and glass production (Cronin et al, 2000). These emissions can contaminate surface water, soil, and plants in the proximity of industrial sites and have resulted in Europe to unexpected high exposure rates in livestock in certain distinct areas (Bunce, 1985).…”

Section: Introductionmentioning

confidence: 99%

Opinion of the Scientific Panel on contaminants in the food chain [CONTAM] related to Fluorine as undesirable substance in animal feed

2004

EFSA Journal

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Fluoride: A review of its fate, bioavailability, and risks of fluorosis in grazed‐pasture systems in New Zealand

Cited by 206 publications

References 107 publications

Severe Dental Fluorosis in Juvenile Deer Linked to a Recent Volcanic Eruption in Patagonia

Severe Dental Fluorosis in Juvenile Deer Linked to a Recent Volcanic Eruption in Patagonia

The levels of fluorine in the sediments of the aquifer and their significance for fluorosis in coastal region of Laizhou Bay, China

Opinion of the Scientific Panel on contaminants in the food chain [CONTAM] related to Fluorine as undesirable substance in animal feed

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