What Levels Of Fluoride Are Harmful To Aquatic Animals

Introduction

Fluoride is the 13th about abundant element in the earth's crust. It is essential for human and animal health. Animals are exposed to fluoride ions particulary by consuming water rich in fluorine. Ingesting small amounts of fluoride in water is generally benign for teeth and bones, peculiarly in immature animals (World Wellness Organization, 2017).

The permissible limit for fluorides in drinking h2o is 1.v mg/l (World Health Organization, 2017). Notwithstanding, long-term ingestion of large amounts can cause serious dental and bone problems in animals.

Controlling the quality of drinking h2o is therefore essential to prevent animal fluorosis, which results in dental lesions (brown enamel stains + chalky appearance and irregularity of the molar table) and bone lesions (exostoses) affecting the mandible, ribs, metacarpus, and metatarsus (National Research Council, 2006). Fluorosis is as well responsible for a refuse in zootechnical performance which explains the economic losses and fifty-fifty the difficulty to develop sheep farming in Tunisia.

Fluorides occur naturally in the surroundings. Because of its high reactivity, fluorine is never nowadays in its elemental state in nature. Information technology is always found in combined grade with other organic or mineral elements that crusade toxicity issues affecting brute, flora, and the environment.

Fluoride pollution comes from man activities such as agriculture, urbanization, industrialization, and mining (Facchineli et al., 2001; Djebbi et al., 2017). Indeed, the tailings of mining waste matter landfills coming from smelting and extraction procedures, including procedure fluids from factories, the remaining fluids afterward the extraction of minerals, metals, fuels, or coal contribute to the environmental contamination (Djebbi et al., 2017).

The impact of wind on atmospheric particles and dry or wet deposits are main pathways for atmospheric dispersion and transport of this pollutant, which subsequently affects water, brute, and flora.

Fluorides can as well exist transported by leaching from precipitation and contaminate streams and groundwater. Air current, by comparing, speedily transports fluoridated airborne dust over long distances. Thus, the main risk of airborne fluoride grit emissions from abandoned mining areas is the presence of unconfined fluorite tailings ponds containing high fluoride loadings that are either wind-borne or transported past water runoff or leached to groundwater (Adjagodo and Agassounon, 2017; Djebbi et al., 2017).

Few studies take evaluated the quantities of fluorides, emitted past the mining waste matter, in the waters and in living animals about the fluorite mine located in the east of Tunisia (Botha et al., 1993). In a Mediterranean climate, with little rainfall and depression ground cover, fluoride grit from mine tailings tin specifically affect the environment surrounding the mine.

The objective of our work was to study the level of fluoride contamination in the deposit region of Hammam zriba past determining the fluoride levels in the water and claret of sheep living in the study expanse.

Methods

Collection of Samples

Our work was carried out on 2 types of samples: water and sheep'south blood. In the study area, sampling was performed over three points. A reference site was used in order to determine the difference in fluoride accumulation in the environment of the mines (Figure one).

Figure 1. Location of study surface area and sampling points.

All the samples were taken in Novembre 2019 in order to assess the level of fluoride contamination in water and blood animals. The concentration of fluoride ions in the different water and claret samples was determined past potentiometry using a fluoride ion selective electrode of the ISE blazon combined Fluoride perfectION™.

The h2o samples are divided into 3 groups co-ordinate to the distance from the mine:

- E1 [Mine-400 yard]

- E2 [400 m−i Km]

- E3 [>2 Km]

The water sampling concerned surface h2o, groundwater, and drinking water in the in the ore deposit region of Hammam Zriba. These samples are distributed to comprehend most of the region and are selected locally based on the number of animals consuming the water. The water samples are then stored in polyethylene sterile bottles to avoid contamination.

Sheep'due south claret (10 ml) was collected from apparently healthy sheeps living in Hammam Zriba region. All the claret samples were taken during three consecutive days in the year 2019 to make sure that the animals did not move betwixt the zones. Afterwards the skin was cleaned with 70% ethanol, blood samples were taken from the jugular vein and collected in heparinized tubes. All samples were taken from developed animals betwixt 4 and 8 years. The claret was then centrifuged at 3,000 rpm for 10 min within 4 h of collection. Plasma was used for the assay. This plasma was so recovered in test tubes and stored at +4°C.

We divided the animals into iii groups: S1, S2, and S3 co-ordinate to the location of their farms in regard to the mine.

• S1:between 0 and 400 yard from the mine (eighteen sheep)

• S2:between 400 and ane,000 yard from the mine (18 sheep)

• S3: ≥ at 2,000 m from the mine (24 sheep)

In this written report, we defined past fluoremia the levels of fluoride concentration in sheep serum and by fluorisis the chronic or long-term poisoning due to repeated ingestion of foods or water containing high levels of fluoride (World Wellness Organization, 2017).

Ideals

The ethics approval or specific consent procedures are non required for the report: "Analysis of fluoride concentrations in sheep serum and in water in the north east of Tunisia ore deposits."

At that place was no fauna experimentation in this study. Just blood samples were taken equally office of the beast wellness cess.

Consent was obtained from owners for their brute's participation in this study.

The animal written report was reviewed and approved by a veterinary practitioner in accordance with adept practices related to the sampling.

Reagents and Laboratory Ware

The analysis method is adult and validated at the laboratory of Pharmacy and Toxicology at the National School of Veterinary Medicine-Tunisia. It is used to measure the concentration of fluorides in solutions where fluoride concentrations are higher than 0.02 mg/50 (detection limit). Therefore, from a sodium fluoride main solution (100 mg/l), five standard solutions with concentrations ranging from 10⁻¹ to 10^{−half dozen}mg/l have been prepared.

The concentration of fluoride ions in the different water and blood samples was determined by potentiometry using a fluoride ions selective electrode of the ISE blazon combined Fluoride perfectION™.

The decision of fluoride ions in the samples was done after the addition of an equal volume of Total Ionic Strength Adjustment Buffer with the post-obit composition: Glacial acetic acrid (57 ml); Sodium chloride (58 yard); Sodium citrate (0.3 g) and bi-distillated h2o (500 ml). The solution is adjusted to pH 5–five.5 with 5 M sodium hydroxide solution. This acidic solution is added to the buffer past successive additions with a graduated pipette. The pH control was done progressively with a calibrated pH meter. It is cooled then made up to 1 liter with bi-distillated water.

In gild to obtain the well-nigh pregnant results possible, we have procured the purest fluoride costless reactants possible and used doubly distilled water for all handling.

Each sample was tested twice. A coefficient of variation ≤ 2% was used to validate the measurement.

Statistical Analysis

The information were analyzed using SPSS (version 22.0). All data were expressed as hateful ± SD and the level of significance was determined at p < 0.05.

Results

In total, 78 water samples and sixty blood samples were taken.

Variation of Fluoride Concentration in the H2o

In the 78 water samples, we noted a positive correlation between the mean of fluoride concentration (one.92 ± 1.38 mg/fifty) and the mean of pH water (9.39 ± 0.27) with a coefficient r = 0.79, and p < 0.001.

Each grouping consisted of 36 samples. The mean fluoride concentration was, respectively, 2.94 ± 1.55 mg/50 in first group E1, 1.79 ± 0.96 mg/50 in the 2d group E2, and 1.03 ± 0.83 mg/l in the third group E3. The divergence between iii groups was statistically significant and p < 0.001.

Comparison of the fluoride concentration co-ordinate to the type of water demonstrated an average of fluoride concentration equal to: 1.62 ± 1.18 mg/fifty in the running water (32 samples), ane.45 ± 0.98 mg/fifty in the deep water (twenty samples), and 2.65 ± i.61 mg/l in the stagnant h2o (26 samples) as shown in the Figure 2.

Effigy 2. Fluoride concentration depending on the type of h2o.

The divergence betwixt this three groups was statistically significant (p = 0.003).

Variation of Fluoremia

Effect of Age on Fluoremia

Five animals (71.4%) anile more than than 4 years had loftier fluoremia (fluoremia> 0.15 mg/l).

The mean of fluoremia for this historic period category was 0.36 ± 0.two mg/l.

13 sheeps (24.5%) aged 4 years had fluoremia exceeding the threshold with an average of 0.15 ± 0.xi mg/fifty for this category. The difference in fluoremia betwixt these two groups was statistically meaning (p = 0.011).

Variation of fluoremia by âge of sheeps was represented in the Figure 3.

Figure 3. Variation of fluoremia by age of animals.

Effect of Gender on Fluoremia

In sheep serum, 18 females (32.1%) had elevated fluoremia higher up cutoff; In dissimilarity, iv males (100%) had normal fluoremia. Merely at that place was no statistically significant difference (p = 0.17).

Result of Altitude From the Mine on Fluoremia

Fifteen sheep (83.iii%) whose convenance was located in the range 0–400 m were positive with elevated levels of fluoride in the blood exceeding the threshold set (fluoremia> 0.xv mg/l) as shown in Table one.

Tabular array 1. Fluoride concentration every bit a function of altitude.

The difference observed with other farms located further away from the mine was statistically meaning (p < 0.001).

We also compared the mean of fluoremia levels of each group of animals based on their distance from the mine. The first grouping S1 had a mean fluoremia equal to 0.33 ± 0.fourteen mg/l, the second grouping S2 had a mean equal to 0.14 ± 0.07 mg/fifty and the tertiary group S3 had a mean equal to 0.9 ± 0.03 mg/fifty. The difference was statistically pregnant (Effigy four).

Figure iv. Mean of fluoremia past distance from the mine.

Statistical analysis identified altitude from mine every bit an independent risk factor for positive fluoremia with OR = 55; 95% confidence interval = [8.eighteen–369.eight] and p < 0.001.

The effect of the correlation identified a Pearson coefficient r = −0.556 and p < 0.001.

Word

In Tunisia, fluorosis is a real obstacle to the development of alive stock farming in some regions of the country, peculiarly in southern Tunisia simply likewise in some northern regions such as Hammam Zriba.

The Hammam Zriba region is a mining area for the extraction of fluoride and other minerals where fluoride toxicity could touch flora and fauna. Sheep are the most affected past fluorosis in this expanse. The majority of the farms are traditional, free-range farms. The animals drink water from the wadis as well as from surface water located nearly the abased fluoride mine.

Our results show that the fluoride levels in water samples collected near the mine are higher than those collected from a greater altitude. Our results match those found by Bengoumi and Kessabi (2007), where the fluoride levels in h2o collected 200 chiliad from a phosphate processing constitute in southern Morocco are very high, in the social club of 4.6 mg/l. This could be related to the weathering and erosion of the various mining discharges that seem to contribute to the contagion of the natural environs by fluoride.

Ambient fluorinated dust from abandoned mines and unconfined fluorite tailings containing a high fluoride load may exist suspended past wind or transported by water runoff, or leached to footing h2o (Gonzalez-fernandez et al., 2011; Martinez et al., 2011).

High fluoride levels in ground water have been reported in other countries, particularly in England, France, Italy, and the USA. Fluoride concentrations range from 0.01 to 4 mg/i, but a predominance of values below i mg/fifty is still noted (Bertrand, 2001). These high fluoride concentrations recorded in deep waters can be related to the prolonged contact of alkaline water with fluoride-rich rocks, which leads to their release and passage through the h2o (Guissouma and Tarhouni, 2015). Sheep and cattle drinking from this water show dental and bone damage wich represented a major signs of fluorosis (Guissouma and Tarhouni, 2015).

As a consequence, they seem to exist associated most oft with footing h2o, with loftier pH values (>7) facilitating ion exchange between F- fluorides and OH- hydroxyl groups, and of the sodium bicarbonate type characterized past depression concentrations of magnesium and calcium due to the low solubility of fluorine (Botha et al., 1993).

In our report, we noticed that high fluoride concentrations in water are related to the increase of its pH.

Similarly, the experimental results carried out by other report (Saxena and Ahmed, 2001) show that an element of group i environment (with a pH ranging from 7.six to 8.half-dozen) is favorable to the dissolution and release of fluorine, which leads to high contents of this ore in the h2o analyzed.

Furthermore, in our study, nosotros demonstrated that higher levels of fluoride in sheep drinking water are associated with higher levels of fluoride in the blood of animals drinking from these waters.

Our results demonstrate that the distance from the mine could be a determining factor in the contagion of animals by fluorine. Other researchers have also found the influence of altitude from the site of fluorinated emissions on the level of fluorine in the blood of the animals examined (Djebbi et al., 2017).

A study carried out by Bengoumi and Kessabi in 2007, has shown an average fluoremia: 0.47 mg/l in camels living 200 m from a phosphate processing plant in southern Morocco.

In our study, we also showed that fluoremia increases with the historic period of the animals. This is explained by the fact that fluorine is a cumulative toxicant. After resorption, fluorides are rapidly transported through the claret stream throughout the body where they are stored in calcium-rich organs such as bones and teeth. Approximately l% of the daily intake of fluoride is deposited in calcium-rich tissues and most of the fluoride in the trunk, 99%, is contained in bones and teeth, with the rest distributed in the blood and richly vascularized organs (World Health Organization, 2002; Kaminsky et al., 2011). This process occurs in the brusk term, only especially in the long term where bones undergo bone remodeling (National Research Council, 2006). Therefore, fluoremia (determination of fluoride in the claret) is an splendid indicator of recent fluoride intake and a good indicator of ecology contamination. It should be determined periodically to determine the risk of fluorosis for at-risk herds.

Moreover, in young animals, 80–90% of the absorbed fluorides are retained in calcium-rich bones and teeth. This memory correlates with the resorbed dose per kilogram of body weight (b.w.); the higher the dose, the greater the retentivity (Earth Health Organisation, 2002; Barbier et al., 2010). Therefore, the determination of fluorides is of no interest in immature animals considering of their high os metabolism, peculiarly in their ability to retain and accumulate fluoride in bones and teeth. Hence the plasma concentration of ionic fluoride is higher in older animals than in young animals (Milhaud et al., 1985; Zulfiya, 2011; Sezai and Ihsan, 2017).

Chronic exposure of animals to loftier levels of fluoride is of concern, hence the need for a prevention plan to inform the public almost the danger posed by fluoride present at high levels in the report area.

Prevention consists to encourage farmers to use drinking water for livestock animals and to watering crops, to proceed food at a safe level by conducting periodic checks of water and animate being food rations and to ensure a balanced diet.

Decision

In this work nosotros noted very high fluoride levels particularly in the areas close to the mine. Therefore, the written report area was highly contaminated by the fluoride for a 300 m radius from the mine (contaminated site) with a clear tendency to subtract while moving abroad from the written report area.

Information Availability Statement

The original contributions presented in the written report are included in the article/supplementary textile, further inquiries tin can be directed to the corresponding author/s.

Ideals Statement

Ethical review and blessing was not required for the creature study because Evaluation of toxicity in animal. Written informed consent was obtained from the owners for the participation of their animals in this study.

Author Contributions

All authors listed have made a substantial, direct and intellectual contribution to the work, and approved information technology for publication.

Funding

We declare that the sources of funding received for the submitted inquiry were carried out at the veterinary schoolhouse of Sidi thabet in the department of Pharmacy and Veterinarian Toxicology.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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Source: https://www.frontiersin.org/articles/10.3389/ftox.2021.643664/full

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