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High Ferrihydrite Turbidity in Groundwater of Samdong-Myeon (Ulsan) by Carbonate-Water Inflow of Deep Origin
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 Title & Authors
High Ferrihydrite Turbidity in Groundwater of Samdong-Myeon (Ulsan) by Carbonate-Water Inflow of Deep Origin
Jeong, Gi-Young; Kim, Seok-Hwi; Kim, Kang-Joo; Jun, Seong-Chun; Ju, Jeong-Woung; Choi, Mi-Jung; Cheon, Jeong-Yong;
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The turbidity in several wells of Samdong-myeon, Ulsan, exceeded potable groundwater standard (1 NTU). Mineralogical analysis showed that the fine suspended particles are ferrihydrite spheres with a size of less than and helical iron-oxidizing bacterial filaments, and their aggregates. Ferrihydrite was almost amorphous only showing two electron diffraction rings, and contained Si and P. Helical bacterial filaments were almost replaced by ferrihydrite. The helical bacteria have played an important role in the ferrihydrite formation by becoming the loci for ferrihydrite precipitation as well as oxidizing ferrous iron. The physicochemical conditions of low pH, low redox potential, high Ca concentration, and high alkalinity are consistent with the hydrogeochemical characteristics of carbonate groundwater, implicating that the inflow of deep ferriferous carbonate groundwater and its oxidation have caused the ferrihydrite turbidity in several wells of the study area.
Groundwater;turbidity;ferrihydrite;bacteria;carbonate water;
 Cited by
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