Iodine mobilization in groundwater system at Datong basin, China: Evidence from hydrochemistry and fluorescence characteristics

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

“…In a way like As, I adsorption on sulfide mineral surfaces most probably involved the exchange of surface hydroxyl or sulfydryl groups with I -species [45]. Such a restraint of extremely reducing condition on I enrichment in groundwater was also observed in our previous study [30].…”

“…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.…”

“…The positive correlation between I and DOC concentration (r 2 = 0.40, α = 0.03) (Fig. 8b) demonstrates that I mobilization may be strengthened by microbially mediated degradation of organic I or I-bound NOM [30]. Sequential redox transformation indicates I migration can be triggered via reduction of I(V) to I -before amorphous Fe(III) reduction [44].…”

“…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.…”

Iodine in Danish Groundwater and Drinking Water

“…intrusion of sea water, influence of old saline GW, or leaching from hydrothermal deposits [23]. Iodine enrichment of the GW is related also to topography, geomorphology, and local hydrogeology [24], as well as the hydrogeochemical conditions and biological activity in the aquifer [25,26].…”