Principal component analysis of fluoride geochemistry of groundwater in Shanxi and Inner Mongolia, China

Hu, Shan; Luo, Ting; Jing, Chuanyong

doi:10.1016/j.gexplo.2012.08.013

Cited by 85 publications

(33 citation statements)

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“…6 However, the pH of natural groundwater with high uoride is usually in the range of 7.6-8.6. 1,40,41 Within this pH range, F removal using LAA reached 70.5-77.2%, four times higher than that achieved using AA (Fig. 10).…”

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confidence: 84%

Synthesis, characterization and application of lanthanum-impregnated activated alumina for F removal

2013

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Elevated fluoride (F) in groundwater presents an obvious environmental concern. Adsorption using activated alumina (AA) is currently the best available technology for F removal, despite its low efficiency, pH dependence, and aluminium (Al) release. The motivation for our study is to synthesise a new F adsorbent by impregnating commercially available granulated AA with lanthanum oxide (LAA), and to explore its F adsorption mechanism on the molecular scale. Five cycles of lanthanum impregnation on AA followed by calcination at 573 K increased the La content up to 19.1% and the F removal from 18.1% by pristine AA to 92.4% by LAA. The SEM, TEM, XRD, TGA, and EXAFS results demonstrated that the 5-20 nm thin flakes of LaOOH on LAA were in an amorphous form, with 7.6 oxygen atoms around each La. This LaOOH layer was uniformly distributed inside the micropores of the 1-3 mm AA granules.LAA exhibited four fold higher F adsorption capacity than AA in the pH range 3.9 to 9.6, with substantially reduced Al release. The ability to regenerate and reuse LAA makes it an attractive sustainable material. Multiple complementary spectroscopic analyses demonstrated that ligand exchange between F and surface hydroxyl groups is the mechanism for F adsorption on LAA. Our work improves the understanding of F interaction with metal oxides on the molecular scale and presents an alternative solution for elevated F water treatment.

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Synthesis, characterization and application of lanthanum-impregnated activated alumina for F removal

2013

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“…HF forming at low pH (Ghosh et al, 2013 (Hu et al, 2013), but also hydrological 61 properties including residence time, and climatic conditions like evapotranspiration 62 and precipitation that make F -concentrations difficult to predict (Amini et al, 2008).…”

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confidence: 99%

Novel DGT method with tri-metal oxide adsorbent for in situ spatiotemporal flux measurement of fluoride in waters and sediments

et al. 2016

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This is an open access article published under a Creative Commons Attribution-NonCommercial-NoDerivs License (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits distribution and reproduction for non-commercial purposes, provided the author and source are cited. General rightsCopyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights.Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws. If you discover content in the Research Portal that you believe breaches copyright or violates any law, please contact openaccess@qub.ac.uk.

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“…The presence of fluoride in drinking water is a considerable public health problem around the world (Jacks et al 2005;Su et al 2013). Fluoride is an essential micronutrient for human beings Hu, Luo, and Jing 2013), but insufficient or excessive intake of fluorine may pose adverse effects to human health (He, An, and Zhang 2013;Xiao, Jin, and Zhang 2015). The underlying hypothesis is that elevated concentrations of fluoride in drinking water may react with calcium in bones and teeth (Katsanou, Siavalas, and Lambrakis 2013), and cause adverse effects to renal and neural function (Organization and Adler 1970;Jackson et al 1995;Katsanou, Siavalas, and Lambrakis 2013).…”

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“…Elevated fluoride in groundwater has drawn worldwide attention, and has been reported in many countries, such as India (Pillai and Stanley 2002;Jacks et al 2005;Reddy et al 2010), China (Currell et al 2011), and eastern African countries (Gaciri and Davies 1993;Tekle-Haimanot et al 2006). However, some individuals suffered from fluorosis due to intake of elevated concentrations of fluoride without treatment because of the cost and inconvenience of alternative drinking water supplies in China (Su et al 2012;Hu, Luo, and Jing 2013). Approximately 50 million people are affected by high fluoride in groundwater above the Chinese drinking water standard (>1.0 mg/L) set by the Ministry of Health of China.…”

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Geochemical Characterization of Fluoride in the Groundwater of the Huaibei Plain, China

Xia²,

Zhou³

et al. 2016

Analytical Letters

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Forty-two groundwater samples were collected for the geochemical characterization of fluoride in the Huaibei Plain, a high fluorine area, in Northern China. The concentration of fluoride in the groundwater was from 0.20 to 3.75 mg/l, and 23.81% (n = 9) of the samples exceeded the drinking water standard of 1.5 mg/l recommended by the World Health Organization. The groundwater was alkaline (pH 7.14 to 8.67), brackish (total dissolved solids 421 to 1196 mg/l), and the water was classified as bicarbonate-sodium, bicarbonate-calcium, bicarbonate-calcium·sodium, and bicarbonate chloride-sodium. This prevailing characteristics may be attributed to mineral weathering, water-rock interactions, and ion exchange in the aquifer. The main source of fluorine in the groundwater may be from the leaching of minerals.The elevated concentration of fluoride in groundwater may be derived from the calcite-fluorite minerals. This study also discusses a number of factors affecting the fluoride concentrations in groundwater. High fluoride concentrations are associated with weakly alkaline conditions, moderate total dissolved solids, and calcium and sodium ions as the dominant ions. Correlations between fluoride and sample depth and SO4 2− were not observed. All samples were below the solubility product curve of CaF2, which may be explained by positive correlation between fluoride and total dissolved solids. Evapotranspiration and runoff conditions also favor fluoride enrichment in groundwater.

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Principal component analysis of fluoride geochemistry of groundwater in Shanxi and Inner Mongolia, China

Cited by 85 publications

References 35 publications

Synthesis, characterization and application of lanthanum-impregnated activated alumina for F removal

Synthesis, characterization and application of lanthanum-impregnated activated alumina for F removal

Novel DGT method with tri-metal oxide adsorbent for in situ spatiotemporal flux measurement of fluoride in waters and sediments

Geochemical Characterization of Fluoride in the Groundwater of the Huaibei Plain, China

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