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Iron Extraction Characteristics of Sediment Samples from a River Bank Filtration Site

강변 여과 취수 지역 퇴적물의 철 화학종 추출 특성

  • Received : 2013.06.10
  • Accepted : 2013.06.25
  • Published : 2013.06.30

Abstract

River bank filtration has been considered as a promising alternative water management scheme, in which groundwater is extracted from an aquifer near a river after infiltration of the river water into the aquifer, thereby improving and maintaining the quality of water recovered. Iron (Fe) associated with sediment in contact with groundwater and infiltrating surface water is an important factor in determining the quality of water recovered from the pumping wells in river bank filtration. This study reports the results of Fe speciation in the aquifer sediment samples collected from different depths at the river bank filtration site in Changwon, studied using four different chemical extraction methods, namely, ferrozine, oxalate, HCl, and DCB methods. Overall, the results show that Fe(II) as well as the total Fe content decreases with depth down to ~20 m and then increases further below. This trend is consistent with the redox characteristics suggested by visual observation. The silt/clay size fraction (${\phi}$ < 62.5 ${\mu}M$) has up to 2~10 times more Fe compared with the sand size fraction (62.5 ${\mu}M$ < ${\phi}$ < 2 mm), depending on the extraction method. Of the four extraction methods, DCB solution extracted the most Fe from the sediment samples. The amounts of Fe extracted by the different extraction methods can be a good indicator of the redox conditions along the depth of the aquifer.

Keywords

river bank filtration;sediment;iron mineralogy;chemical extraction;groundwater

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Cited by

  1. Analytical Evaluation of Interference and Ratio of River Water at Riverbank Filtration Pumping Wells vol.47, pp.8, 2014, https://doi.org/10.3741/JKWRA.2014.47.8.685
  2. Evaluating Effects of Membrane Filter Pore Sizes on Determination of Dissolved Concentrations of Major Elements in Groundwater and Surface Water Near Nakdong River vol.20, pp.4, 2015, https://doi.org/10.7857/JSGE.2015.20.4.031

Acknowledgement

Supported by : 한국지질자원연구원