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2025 Vol.30, Issue 5 Preview Page
Assessment of Metal Diffusion Due to Stabilization of Vadose Zone Soil Through Groundwater Monitoring using Diffusive Gradients in Thin Films

Diffusive gradients in thin films 기반 지하수 모니터링을 통한 불포화대 토양 안정화에 따른 중금속 확산 여부 평가

Kyu-Young Shim1
,
Kwangjin Park2
,
Seungwoo Lee2
,
Jongmin choi2
,
Daeho Kim2
,
 Jinsung An13*
,
Kyoungphile Nam4
심규영 1
,
박광진 2
,
이승우 2
,
최종민 2
,
김대호 2
,
안진성 13*
,
남경필 4
1Department of Smart City Engineering, Hanyang University, Ansan 15588, South Korea
2Daeil Engineering & Construction CO., LTD., Seoul 06719, South Korea
3Department of Civil and Environmental Engineering, Hanyang University, Ansan 15588, South Korea
4Department of Civil and Environmental Engineering, Seoul National University, Seoul 08826, South Korea
1한양대학교 ERICA 스마트시티공학과
2(주)대일이앤씨
3한양대학교 ERICA 건설환경공학과
4서울대학교 건설환경공학부
*Corresponding Author
31 October 2025. pp. 22-29
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Abstract

This study evaluated groundwater metal behavior before and after stabilization in a difficult-to-remediate site using diffusive gradients in thin films (DGT). Iron salt solutions (FeCl 3 ) and neutralizing agents (NaOH) were sequentially injected into the vadose zone for in situ Fe oxides synthesis, and time-weighted average concentrations (TWAC) of As, Cd, and Zn in the groundwater at four monitoring wells were determined using the DGT to assess the changing patterns of metal leaching from the vadose zone into groundwater. To determine whether the average concentration changed after stabilization, a Welch’s t -test was applied. The results showed that no statistically significant changes were observed for all metals in all wells, with p -values exceeding 0.05. Also, a segmented regression was applied to detect the change points and slope shifts. Most change points occurred before stabilizing agent injection, and those observed after injection showed no significant slope changes. Overall, stabilizing agent injection had no significant effect on groundwater metals, while the DGT-segmented regression approach was useful for detecting gradual dispersion.

Keywords
Passive sampling
Diffusive boundary layer
Segmented regression
Groundwater contamination
Difficult-to-remediate site
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Information
  • Publisher :The Korean Society of Soil and Groundwater Environment
  • Publisher(Ko) :한국지하수토양환경학회
  • Journal Title :Journal of Soil and Groundwater Environment
  • Journal Title(Ko) :지하수토양환경
  • Volume : 30
  • No :5
  • Pages :22-29
  • Received Date : 2025-08-13
  • Revised Date : 2025-08-22
  • Accepted Date : 2025-08-27
  • DOI :https://doi.org/10.7857/JSGE.2025.30.5.022
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