Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Development of Gold Amalgam Voltametric Microelectrode for the Quantification of O2, Fe2+, Mn2+, and HS-

퇴적물 공극수내 O2, Fe2+, Mn2+ 및 HS- 센싱을 위한 금아말감 미세전극 개발

  • Kwon, Soongil (Department of Environment System Engineering, Korea University Sejong Campus) ;
  • Park, Donggeun (Department of Electronics and Information Engineering, Korea University Sejong Campus) ;
  • Choi, Geunyoung (Department of Electronics and Information Engineering, Korea University Sejong Campus) ;
  • Sung, Jaebin (Department of Electronics and Information Engineering, Korea University Sejong Campus) ;
  • Kim, Hyunsoo (Department of Electronics and Information Engineering, Korea University Sejong Campus) ;
  • Lee, Jae Woo (Department of Electronics and Information Engineering, Korea University Sejong Campus) ;
  • Hong, Yongseok (Department of Environment System Engineering, Korea University Sejong Campus)
  • 권순길 (고려대학교 세종캠퍼스 환경시스템공학과) ;
  • 박동근 (고려대학교 세종캠퍼스 전자 및 정보공학과) ;
  • 최근영 (고려대학교 세종캠퍼스 전자 및 정보공학과) ;
  • 성재빈 (고려대학교 세종캠퍼스 전자 및 정보공학과) ;
  • 김현수 (고려대학교 세종캠퍼스 전자 및 정보공학과) ;
  • 이재우 (고려대학교 세종캠퍼스 전자 및 정보공학과) ;
  • 홍용석 (고려대학교 세종캠퍼스 환경시스템공학과)
  • Received : 2021.12.29
  • Accepted : 2022.03.18
  • Published : 2022.03.30
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Abstract

A gold amalgam voltammetric microelectrode (GAVM) system was developed for the quantification of dissolved biogeochemical species, such as O2, Fe2+, Mn2+, and HS- in sediment porewater. Commercially available Ag/AgCl and platinum electrodes were used as the reference and counter electrode, respectively, and a gold amalgam microelectrode was fabricated in the laboratory using 150-um diameter gold wire and a borosilicate capillary tube with a 1.6-mm diameter. A portable potentiostat (Metrohm, DropSens) was used for the application of voltage sweeping and to acquire the electric current. For sediment profiling, a commercially available actuator was customized and modified. The analysis method used in the system used the most widely used analysis method among the electrochemical analysis currently used The GAVM system was successively calibrated with the species and applied to estuarine sediments. The porewater analysis showed that the oxygen concentration was decreased to zero at a depth of 0.6 mm, and maximum Mn2+ and Fe2+ concentrations of 50 uM and 20 uM were detected at 2 and 3-cm depths, respectively. Maximum HS- concentrations of 10 uM were detected at 4 cm in the deeper sediments. The GAVM system was successfully developed and applied to the sediment and can be used to better understand biogeochemical reactions.

Keywords

References

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