Econ. Environ. Geol. 2004; 37(6): 657-667

Published online December 31, 2004

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Occurrence and Species of Arsenic in the Groundwater of Ulsan Area

Uk Yun1*, Byong-Wook Cho1 and Kyu-Youl Sung2

1Korea Institute of Geoscience and Mineral Resources, Daejon 305-350, Korea
2Department of Earth and Environemental Sciences, Korea University, Seoul 136-701, Korea

Correspondence to :

Uk Yun

yunuk@kigam.re.kr

Received: October 31, 2004; Accepted: November 29, 2004

Abstract

<p>Arsenic was detected in the 29 water samples out of the 46 groundwaters located in the Ulsan metropolitan area and it's concentration ranges from <0.1 to 72㎍/L. Among them the arsenic concentrations of three samples are over domestic drinking-water requirements (50㎍/L), and those of 10 samples are more than WHO MCLs, 10㎍/L. High arsenic groundwater were recognized in the two region; one was the tectonic line, especially Ulsan iron mine at Dalcheunri and the other was around Hyomundong distributed Jeongja conglomerate. It is estimated that the former is originated from pyrite oxydation type, oxygenated redox, whilst the latter is resulted from oxidation of reducted FeOOH. The species of arsenic in groundwater is in pentavalent arsenic, H2AsO4-, HAsO4-2 near tectonic line, and trivalentarsenic, H3AsO3 around Hyomundong.

Keywords Ulsan, arsenic, groundwater, WHO

Article

Econ. Environ. Geol. 2004; 37(6): 657-667

Published online December 31, 2004

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Occurrence and Species of Arsenic in the Groundwater of Ulsan Area

Uk Yun1*, Byong-Wook Cho1 and Kyu-Youl Sung2

1Korea Institute of Geoscience and Mineral Resources, Daejon 305-350, Korea
2Department of Earth and Environemental Sciences, Korea University, Seoul 136-701, Korea

Correspondence to:

Uk Yun

yunuk@kigam.re.kr

Received: October 31, 2004; Accepted: November 29, 2004

Abstract

Arsenic was detected in the 29 water samples out of the 46 groundwaters located in the Ulsan metropolitan area and it's concentration ranges from <0.1 to 72㎍/L. Among them the arsenic concentrations of three samples are over domestic drinking-water requirements (50㎍/L), and those of 10 samples are more than WHO MCLs, 10㎍/L. High arsenic groundwater were recognized in the two region; one was the tectonic line, especially Ulsan iron mine at Dalcheunri and the other was around Hyomundong distributed Jeongja conglomerate. It is estimated that the former is originated from pyrite oxydation type, oxygenated redox, whilst the latter is resulted from oxidation of reducted FeOOH. The species of arsenic in groundwater is in pentavalent arsenic, H2AsO4-, HAsO4-2 near tectonic line, and trivalentarsenic, H3AsO3 around Hyomundong.

Keywords Ulsan, arsenic, groundwater, WHO

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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