Geochemical process of groundwater fluoride evolution along global coastal plains: Evidence from the comparison in seawater intrusion area and soil salinization area

Chen, Qiao; Jia, Cuiping; Wei, Jiuchuan; Dong, Feifei; Yang, Weigang; Hao, Decheng; Jia, Zhiwen; Ji, Yongming

doi:10.1016/j.chemgeo.2020.119779

Cited by 44 publications

(13 citation statements)

References 36 publications

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“…The geochemical characteristics of high Na þ and low Ca 2þ can greatly promote fluoride-leaching from soil or rock because of the following reasons: First, the Na-F combination is prior to Ca-F or Mg-F combination. Second, the NaF solubility is remarkably higher than CaF 2 or MgF 2 (Chae et al 2007;Chen et al 2012Chen et al , 2019Chen et al , 2020b. Meanwhile, the fluoride levels in groundwater are restricted by Ca 2þ levels because of the low CaF 2 solubility, and Ca 2þ -F À negative relationship in groundwater is commonly observed and documented (Ozsvath 2009;Wang et al 2015).…”

Section: Discussionmentioning

confidence: 99%

“…Groundwater Na þ increases because more Na þ mixes when seawater intrudes. While groundwater Ca 2þ generally decreases because of the alkaline condition, CaCO 3 precipitation and Na-Ca cation exchange (Gao et al 2007;Wang et al 2015;Chen et al 2020b). The geochemical characteristics of high Na þ and low Ca 2þ can greatly promote fluoride-leaching from soil or rock because of the following reasons: First, the Na-F combination is prior to Ca-F or Mg-F combination.…”

Section: Discussionmentioning

confidence: 99%

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Fluoride-leaching simulation of aquifer sediment and its influence on groundwater fluoride levels along coastal plains

Jia

Chen

et al. 2022

Water Supply

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Seawater intrusion and drinking-water fluorosis are frequently documented along coastal plains. Groundwater is characterized by high OH−, Na+, total dissolved solids, and low Ca2+ because of seawater intrusion, and such conditions favor sediment fluoride-leaching and fluorosis. But the geological process of seawater intrusion has not been noticed when high-fluoride groundwater along coastal areas is discussed. The groundwater and sediments in a typical seawater intrusion and fluorosis area are gained, and fluoride-leaching simulation experiments are performed. Sediment fluoride levels are equal to or lower than average sediment fluoride levels in China and Shandong province, but strong fluoride-leaching in aquifers is observed. Compared with the supplied water from the non-intruded neighboring area, the local groundwater has higher fluoride levels, together with higher pH, total dissolved solids, HCO3−, Cl−, Br−, SO42−, Na+, K+, and low Ca2+ because of seawater intrusion. Aquifer sediment fluoride-leaching ability increases with an increase in seawater (brine water) mixing ratios, and NaCl or NaHCO3 levels, but with a decrease in CaCl2 levels. This directly confirms that seawater (brine water) intrusion promotes sediment fluoride-leaching, and the high pH, Na+, HCO3−, and low Ca2+ levels caused by seawater intrusion are responsible for the high-fluoride groundwater along coastal plains.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Fluoride-leaching simulation of aquifer sediment and its influence on groundwater fluoride levels along coastal plains

Jia

Chen

et al. 2022

Water Supply

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“…Different from seawater intrusion which is the mixing process between seawater and groundwater, SWI is the mixing process between underground saline water and fresh water in groundwater environment and away from coastline. It can change the properties of groundwater environment, such as ion exchange and groundwater salinization, which can lead to increase of TDS and Clconcentrations and enrichment of high-fluorine groundwater (Gao et al, 2017;Liu et al, 2017;Chen et al, 2019Chen et al, , 2020. A saline-fresh water mixing zone (SFMZ) has formed under the condition of SWI.…”

Section: Introductionmentioning

confidence: 99%

The groundwater environmental effects and health risk assessment in saline-fresh water mixing zone of coastal plain

Liu

Yang

Liu

et al. 2022

Preprint

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The groundwater environment is important to human living in coastal plain. In this study, southern Laizhou Bay (SLB) is chosen as the study area and 47 groundwater samples are collected to analyze groundwater environmental effects and health risk assessment in saline-fresh water mixing zone (SFMZ) of coastal plain. Influenced by saline water intrusion (SWI), K+, Na+, Ca2+, Mg2+, Cl-, SO42- and HCO3- concentration values are exceeded WHO standard value seriously. High-F groundwater is the product in process of SWI, caused by cation exchange, weakly alkaline environment, evaporation and fluorite dissolution. Na+ concentration and a decrease in the Ca2+ concentration can promote further dissolution of fluorite and other F-containing minerals. Based on the health risk assessment method, the average HQ sequence in typical groundwater pollutants is Cl- > F- > NO3-N > Se > Mn > NO2-N > Cu > Pb > Zn > Fe, and the CR sequence caused by carcinogenic heavy metals is Cd > As > Cr. The greatest non-carcinogenic risk to adults and children in the study area is caused by Cl-. Cd is the most important indicator of carcinogenic risk, and its contribution to CR accounts for 74.531%. The regions with high health impacts of carcinogenic pollutants in groundwater are mainly concentrated in the central part of the study area, with the exceeding range of 35.373% for adults and 44.768% for children. Non-carcinogenic pollutants are enriched in SFMZ, which have greater impacts on human body and lead to higher health risks compared with carcinogenic pollutants.

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“…Occurrence of fluoride in groundwater has attracted wide attention in the world due to it closely related to human health 3 . Fluoride is an essential micronutrient to maintain human bone development and growth 4 . Moderate fluoride intake can reduce the incidence rate of dental caries and promote bone development.…”

Section: Introductionmentioning

confidence: 99%

“…Elevated fluoride in groundwater is primary originated from lasting water–rock interactions and mineral weathering from fluoride bearing minerals such as fluorit, fluor apatite, biotite and phlogopite 9 , 21 , 22 . The concentration and transformation of fluorine in groundwater are determined by various factors, such as hydrogeochemical settings, temperature, pH, solubility of fluoride rich minerals and complexing ions 12 , 23 , 24 . In addition, high fluoride groundwater could be related to anthropogenic activities, such as phos-phate fertilizer application, burning of coal, glass and ceramic industry 25 , 26 .…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution and potential health risk of fluoride in drinking groundwater sources of Huaibei, Anhui Province

You

Liu

et al. 2021

Sci Rep

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Fluoride enrichment in drinking groundwater at Huaibei leads to potential health risk to the residents. A total of 49 groundwater samples from groundwater sources were collected to evaluate the potential health risk of fluoride ingestion through drinking water for children and adults in Huaibei. Results shown that the average concentration of fluoride in centralized sources is less than that of decentralized sources, which may be attributed to different geological conditions including fluoride-rich minerals, environmental conditions and high fluoride waste discharge. The corresponding health risk value of fluoride in centralized source is lower than that in decentralized one, and the HI values of fluoride in the three exposed groups varied in the same order: infants > children > adults. Infants and children were more sensitive receptors to the non-carcinogenic health hazards of fluoride than adults. Special care should be taken to infants and children for the highly prone to health risk compared to adults.

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Geochemical process of groundwater fluoride evolution along global coastal plains: Evidence from the comparison in seawater intrusion area and soil salinization area

Cited by 44 publications

References 36 publications

Fluoride-leaching simulation of aquifer sediment and its influence on groundwater fluoride levels along coastal plains

Fluoride-leaching simulation of aquifer sediment and its influence on groundwater fluoride levels along coastal plains

The groundwater environmental effects and health risk assessment in saline-fresh water mixing zone of coastal plain

Spatial distribution and potential health risk of fluoride in drinking groundwater sources of Huaibei, Anhui Province

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