Worldwide contamination of water by fluoride

Ali, Shakir; Thakur, Sachin Kumar; Sarkar, Aveek; Shekhar, Shashank

doi:10.1007/s10311-016-0563-5

Cited by 341 publications

(117 citation statements)

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“…High concentration of fluoride (> 1.5 mg/L) may lead to chronic fluoride toxicity, which manifest as dental/skeletal fluorosis, while lower concentration (< 0.8 mg/L) results in dental caries ,. Thus, the problem of excess fluoride in groundwater resources has become a burning health‐related geo‐environmental issue in various part of the globe like South Africa, China, Sri Lanka and India ,. In Indian regions, the state of Rajasthan, Gujarat, Panjab and Tamil Nadu are reported to be highly fluoride affected areas.…”

Section: Introductionmentioning

confidence: 99%

Organometallic Adsorbent for Mitigating Fluoride from Water: An Environment‐Friendly Approach

2018

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Fluoride-related health hazards are a serious environmental problem across the globe. Unavailability of an effective therapeutic agent to cure fluorosis creates an exigency to adopt preventive measures to curb excess fluoride intake. Herein, we report a zirconium-based organometallic adsorbent (ZrVAc) for mitigating fluoride from water. The crosslinked, three dimensional and porous architecture of ZrVAc, composed of zirconyl methacrylate (ZrDMA) and vinyl acetate (VAc) have high porosity and excellent mechanical stability. The experimental factors such as effects of solution pH, coexisting anions, temperature, pH pzc , isotherm models and surface chemistry were investigated to verify the adsorption properties of ZrVAc.The equilibrium data were fitted well with Freundlich and Langmuir adsorption isotherms. The highest fluoride adsorption capacity (q m ) was found to be 138 mg/g (at pH 7.0 � 0.2, initial F À concentration 100 mg/L, adsorbent dose 0.5 g/L for 6 h). The thermodynamic constants ΔG, ΔH, and ΔS were calculated as 45.158 KJ mol À 1 (at 303 K), À 37.64 KJ mol À 1 , and À 0.161 KJ mol À 1 . ZrVAc showed efficient adsorption in pH range of pH 6.0-8.0 which is preferable for field water application. Toxicity characteristics leaching procedure (TCLP) results suggested the ZrVAc was inert; does not leach out any contaminants (Zr, F À ) and delivers safe and potable treated water.

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Section: Introductionmentioning

confidence: 99%

Organometallic Adsorbent for Mitigating Fluoride from Water: An Environment‐Friendly Approach

2018

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“…Moreover, 34% of groundwater samples are found under Na + -HCO 3 − or mixed type (Na + -K + -HCO 3 − ) and cause favor to fluoride dissolution in the study region. A number of previous studies suggested that the Na + -HCO 3 − water type, decreasing calcium concentration, increasing sodium concentration, and neutral-to-alkaline pH nature of water are more favorable for fluoride dissolution process, thereby accelerating the fluoride concentration in groundwater (Rao et al 2017;Ali et al 2016;Adimalla et al 2018a, b;Narsimha and Sudarshan 2017b). Moreover, Na + -HCO 3 − water type, mainly deeper groundwater, is influenced by the ion exchange process (Saxena and Ahmed 2003).…”

Section: Groundwater Typesmentioning

confidence: 99%

“…Nearly 200 million people from 25 nations are affected by the deadly disease of fluorosis (Ali et al 2016;Adimalla and Venkatayogi 2017). Fluorosis-affected regions are reported from China (Li et al , 2014Wu et al 2015), India (Narsimha and Rajitha 2018; Adimalla et al 2018a, b, c;Narsimha 2018;Sudarshan 2017a, b, 2018a, b;Rao et al 2014;Subba Rao et al 2015), Africa (Gizaw 1996), Korea (Kim and Jeong 2005), Mexico (Diaz-Barriga et al 1997), Kenya (Gikinju et al 2002) and Nigeria (Gbadebo 2012).…”

Section: Introductionmentioning

confidence: 99%

“…lepidolite, montmorillonite, kaolinite, pegmatite, mica, clays, villuanite, phosphorite, and some micas weathered from silicates, igneous, and sedimentary rocks, especially shale (Adimalla et al 2018a;Ayoob and Gupta 2006;Sudarshan 2017a, 2018a, b), and high rates of evaporation and low precipitation in arid and semiarid areas can also contribute to the fluoride enrichment Venkatayogi 2017, 2018;Subba Rao et al 2015). However, fluoride is an important element for human health which has certain limits for intake (Rao et al 2017;Ali et al 2016;Narsimha and Sudarshan 2017a, b). World Health Organization (WHO 1984) has fixed a safe limit for fluoride from 0.5 to 1.5 mg/L in drinking water.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of fluoride contamination and distribution: a case study from a rural part of Andhra Pradesh, India

Adimalla

Sudarshan

Das³

2019

Appl Water Sci

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In total, 123 groundwater samples were collected to evaluate the suitability for drinking purpose in a rural part of Andhra Pradesh, India. The groundwater is alkaline in nature and pH varying from 7.18 to 9.32 with a mean value of 8.36. The hydrogeochemical analysis reveals that the fluoride concentration varies from 0.4 to 5.8 mg/L with a mean of 1.98 mg/L. Higher fluoride concentration is found in west-central parts of Markapur region. The villagers have been exposed to the intake of high fluoride-bearing groundwater for the prolonged period and suffering from the deadly disease fluorosis. However, with respect to groundwater chemistry, the fluoride concentration is high in Na + -HCO 3 − -type groundwater and low in Ca 2+ -HCO 3 − -type groundwater in the Markapur region. Data plotted in Gibbs diagram show that all groundwater samples fall under rock weathering dominance group with a trend toward the evaporation dominance category. Therefore, rock-water interaction is the primary cause of elevated fluoride in the groundwater of the study region. Furthermore, a significant positive correlation exists between F − and pH, HCO 3 as well as negative correlation exists between Fand Ca 2+ and NO 3 − , which supports that the alkaline nature of water is the main cause for dissolving fluoride-bearing minerals.

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“…The antibacterial effect is also limited as very little could arrive at the oral lesion area after systemic circulation [15][16][17]. Fluoride in drinking water has been used for the prevention of dental caries but might cause excessive intake, leading to fluorosis [18]. Therefore, local drug therapy is now more considered for oral infectious diseases [19,20].…”

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confidence: 99%

Emerging Applications of Drug Delivery Systems in Oral Infectious Diseases Prevention and Treatment

et al. 2020

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The oral cavity is a unique complex ecosystem colonized with huge numbers of microorganism species. Oral cavities are closely associated with oral health and sequentially with systemic health. Many factors might cause the shift of composition of oral microbiota, thus leading to the dysbiosis of oral micro-environment and oral infectious diseases. Local therapies and dental hygiene procedures are the main kinds of treatment. Currently, oral drug delivery systems (DDS) have drawn great attention, and are considered as important adjuvant therapy for oral infectious diseases. DDS are devices that could transport and release the therapeutic drugs or bioactive agents to a certain site and a certain rate in vivo. They could significantly increase the therapeutic effect and reduce the side effect compared with traditional medicine. In the review, emerging recent applications of DDS in the treatment for oral infectious diseases have been summarized, including dental caries, periodontitis, peri-implantitis and oral candidiasis. Furthermore, oral stimuli-responsive DDS, also known as "smart" DDS, have been reported recently, which could react to oral environment and provide more accurate drug delivery or release. In this article, oral smart DDS have also been reviewed. The limits have been discussed, and the research potential demonstrates good prospects.Molecules 2020, 25, 516 2 of 29 problems. For example, systemic antibiotics such as tetracycline, beta-lactam antibiotics, nitroimidazoles have been used, especially in cases of periodontal diseases and peri-implantitis [12]. However, systemic antibiotics could cause problems like drug resistance, dysbacteriosis, and systemic side effects [13,14]. The antibacterial effect is also limited as very little could arrive at the oral lesion area after systemic circulation [15][16][17]. Fluoride in drinking water has been used for the prevention of dental caries but might cause excessive intake, leading to fluorosis [18]. Therefore, local drug therapy is now more considered for oral infectious diseases [19,20]. However, the conventional forms of local therapy, like drug suspension or rinse of anti-infection agents, could be easily washed off and thus could not last long in the oral cavity. Complex local lesions like deep periodontal pockets and teeth fissure are also difficult to reach. In order to improve the effect of prophylaxis and treatment, more precise targeting therapy is quite essential [21,22]. Therefore, drug delivery systems have drawn great attention in recent decades in oral infectious diseases. Drug delivery systems (DDS) are devices that can transport and release the therapeutic agents or bioactive substances to certain sites at certain rates in vivo [23,24], usually composed of the carriers and associated therapeutics [25]. They have been widely explored in biomedical research. With local drug administration and controlled drug release, DDS could provide higher curative efficiency and fewer side effects [23,26,27]. With all these advantages, DDS has been reported w...

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Worldwide contamination of water by fluoride

Cited by 341 publications

References 176 publications

Organometallic Adsorbent for Mitigating Fluoride from Water: An Environment‐Friendly Approach

Organometallic Adsorbent for Mitigating Fluoride from Water: An Environment‐Friendly Approach

Assessment of fluoride contamination and distribution: a case study from a rural part of Andhra Pradesh, India

Emerging Applications of Drug Delivery Systems in Oral Infectious Diseases Prevention and Treatment

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