Investigation of arsenic contamination from geothermal water in different geological settings of Taiwan : Hydrogeochemical and microbial signatures

• The dissemination of dissolved elements, including arsenic (As(V)/As(III)) and microbial diversity was studied in hydrothermal systems of Taiwan considering three different principal geological settings such as Igneous rock terrains, Metamorphic terrains and Sedimentary terrains to understand the cycling, fate and transport and potential impact of As on hydrological systems. The results were indicated as strongly acidic (pH< 3), sulfate-enriched waters of H-SO4-type in igneous-sedimentary rock terrains, slightly alkaline waters (pH: 8–8.95) in metamorphic terrains, and circum-neutral waters (pH 6.47–7.41) of Na-HCO3/Na-Cl-HCO3-type in metamorphic-sedimentary terrains. The geothermal waters were enriched with As in igneous terrains (Beitou: 1.46 mg/L) as compared to sedimentary (0.16 ± 0.14 mg/L) or metamorphic (0.06 ± 0.02 mg/L) terrains. The 16S rRNA gene sequence of bacterial diversity indicates prevalence of mesophilic sulfur- and thiosulfate-oxidizing bacterium in Taipu (igneous rock terrains). The discharge from geothermal springs with significant levels of As and other toxic element contaminate the surface and groundwater of environment.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)

Nyckelord

Alkalinity

Arsenic

Geology

Geothermal springs

Groundwater

Groundwater pollution

Metamorphic rocks

RNA

Sedimentary rocks

Sedimentology

Sustainable development

16S rRNA gene sequence

Arsenic contamination

Bacterial diversity

Fate and transport

Hydrological system

Hydrothermal system

Metamorphic terrains

Microbial diversity

Igneous rocks

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