Aqueous geochemistry of high-fluoride groundwater in Datong Basin, Northern China

Hydrogeochemistry of co-occurring geogenic arsenic, fluoride and iodine in groundwater at Datong Basin, northern China

“…1), a typical region where As, F and/or I contaminated groundwater occurs according to our hydrogeological-hydrochemical survey [15,29,30]. Three aquifers residing in the depths of 20, 28 and 38 m below land surface respectively, where high As, F and/or I groundwater preferably resides (Fig.…”

“…However, studies on high I groundwater at Datong revealed that similar to As, solid-phase I was mainly bound to Fe (hydr)oxides and NOM in sediments and might be released under reducing conditions [28]. More importantly, high As, F and I groundwater occurred in alluvial-lacustrine plains of Datong implies that they may be concurrently mobilized [29][30][31]. Yet, to the extent of our knowledge, no work has been done to explore mechanisms governing mobilization of As, F and I as co-contaminants in unconsolidated aquifers.…”

Fluoride and iodine enrichment in groundwater of North China Plain: Evidences from speciation analysis and geochemical modeling

“…Since the similarity in charge and radius, fluorine can occur in mineral structures via replacing hydroxide ion (Saxena and Ahmed, 2001). Na-HCO 3 type water with low Ca concentration favors the dissolution of fluorite and ion exchange between hydroxide ion and mineral fluorine (Su et al, 2013). Chemical weathering and/or dissolution of fluorine bearing minerals would cause the fluorine release into groundwater (Su et al, 2015).…”

Coupled precipitation-ultrafiltration for treatment of high fluoride-content wastewater

“…Most common fluoride-bearing minerals in the earth's crust include fluorite (CaF 2 ), fluorapatite (Ca 5 (PO 4 ) 3 F), and cryolite (Na 3 AlF 6 ) [2]. Fluoride concentration in natural waters depends on various factors, such as temperature, pH, solubility of fluorine-bearing minerals, anion exchange capacity of aquifer materials, the nature of geological formations drained by water, and contact time of water with a particular formation [3].…”

“…Fluoride concentration in natural waters depends on various factors, such as temperature, pH, solubility of fluorine-bearing minerals, anion exchange capacity of aquifer materials, the nature of geological formations drained by water, and contact time of water with a particular formation [3]. Some groundwater may contain high concentrations of fluoride due to special geological mineral compounds [2]. An appropriate concentration of fluoride in drinking water may prevent dental cavities, but excess ingestion of fluoride would lead to various diseases, such as dental and skeletal fluorosis [4].…”