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2024 Vol.29, Issue 4 Preview Page
Feasibility of Diffusive Gradients in Thin Films for Monitoring Heavy Metals in Groundwater

지하수 내 중금속 모니터링을 위한 diffusive gradients in thin films의 적용 가능성 평가

Kyu-Young Shim1
,
Kwangjin Park2
,
Seungwoo Lee2
,
Jongmin Choi2
,
Subin Choi2
,
Jinsung An13*
,
Kyoungphile Nam4
심규영 1
,
박광진 2
,
이승우 2
,
최종민 2
,
최수빈 2
,
안진성 13*
,
남경필 4
1Department of Smart City Engineering, Hanyang University, Ansan 15588, South Korea
2Daeil Engineering & Consulting Co., LTD
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 August 2024. pp. 12-20
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Abstract

Diffusive gradients in thin films (DGT) are passive sampling devices used to determine the time-weighted average concentrations (TWAC) of contaminants. To ensure accurate performance in groundwater, it is crucial to identify environmental characteristics and maintain optimal operational conditions. This study examined the deployment time required to reach effective capacity, the thickness of the diffusive boundary layer (DBL) under stagnant water conditions, and biofilm formation on the DGT surface using groundwater samples. When using DGT with Chelex gel (A=3.14 cm²), the effective capacity was 0.7 mg for Cd and 250 mg for Zn, with a deployment time of 24 h. Lower Cd accumulation was due to the competition effect of coexisting ions. The DBL thickness under stagnant conditions was 0.074 cm, 93% of the diffusion gel's thickness (0.08 cm). Neglecting DBL thickness in TWAC calculations led to a 79% decrease in the determined concentration. No biofouling was observed during the 28-d DGT deployment in groundwater. In conclusion, it is essential to consider the appropriate deployment time, DBL thickness, and biofilm formation to ensure accurate DGT performance in determining contaminant levels in groundwater.

Keywords
diffusive gradients in thin films
deployment time
effective capacity
diffusive boundary layer
biofilm
References

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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 : 29
  • No :4
  • Pages :12-20
  • Received Date : 2024-07-19
  • Revised Date : 2024-07-25
  • Accepted Date : 2024-08-16
  • DOI :https://doi.org/10.7857/JSGE.2024.29.4.012
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