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Difference in attenuation among Mn, As, and Fe in riverbed sediments.

Saikat Sengupta1, Ondra Sracek2, Jiin-Shuh Jean3

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|August 14, 2017
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Summary

High arsenic groundwater discharge into Taiwan

Keywords:
Arsenic attenuationGroundwater dischargeRedox reactionsSediment-water interactionSr-Nd isotopes

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Hydrogeology

Background:

  • High arsenic concentrations in groundwater are a concern in the Chianan Plain (CP), SW Taiwan.
  • Understanding arsenic's fate in river systems receiving this groundwater is crucial.

Purpose of the Study:

  • To investigate changes in river water and sediment chemistry due to arsenic-rich groundwater discharge.
  • To assess arsenic behavior in river water and hyporheic zones.

Main Methods:

  • Collected river water, pore water, shallow sediments, and source rocks from 42 locations in the CP.
  • Analyzed samples for arsenic, iron, and manganese concentrations.
  • Performed sequential extraction to determine arsenic binding in sediments.

Main Results:

  • Arsenic concentrations in river sediments generally reflect background soil and crustal levels.
  • Arsenic is primarily bound to iron oxyhydroxides (FeOOH) in sediments.
  • No significant arsenic enrichment in sediments or depletion in pore water was observed.
  • Manganese enrichment in sediments suggests its precipitation at higher redox potentials than iron and arsenic.

Conclusions:

  • Arsenic attenuation processes are not active or detectable in the studied river and hyporheic zones.
  • Manganese precipitation may influence redox conditions but does not significantly attenuate arsenic in this environment.