Econ. Environ. Geol. 2008; 41(6): 673-683

Published online December 31, 2008

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Geochemical Investigation on Arsenic Contamination in the Alluvial Groundwater of Mankyeong River Watershed

Jeong-Tae Moon, Kangjoo Kim*, Seok-Hwi Kim, Cheon-Sung Jeong and Gab-Soo Hwang

School of Civil and Environmental Engineering, Kunsan National University, Jeonbuk, 573-701, Korea

Correspondence to :

Kangjoo Kim

kangjoo@kunsan.ac.kr

Received: September 30, 2008; Accepted: December 24, 2008

Abstract

As-rich alluvial groundwaters occurring in the agricultural area of Mankyeong River watershed were geochemically studied. 15 out of 29 investigated wells (52%) showed As levels exceeding the WHO drinking water standard (10 μg/L). Their chemistry is characterized by low Eh levels, low NO3 and SO4 concentrations, and high pH, alkalinity, Fe, NH4, and PO4 levels. This suggests that arsenic is enriched by the reductive dissolution of As-bearing Fe-/Mn-(hydro)oxides, the commonest process in Bangladesh and West Bengal of India, of which groundwaters are severely contaminated by As. It was also revealed that As concentrations in the area are strongly regulated by the presence of agrochemicals such as NO3 and SO4.

Keywords arsenic, groundwater, alluvial aquifer, reductive dissolution of Fe (hydro)oxide, agrochemicals

Article

Econ. Environ. Geol. 2008; 41(6): 673-683

Published online December 31, 2008

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Geochemical Investigation on Arsenic Contamination in the Alluvial Groundwater of Mankyeong River Watershed

Jeong-Tae Moon, Kangjoo Kim*, Seok-Hwi Kim, Cheon-Sung Jeong and Gab-Soo Hwang

School of Civil and Environmental Engineering, Kunsan National University, Jeonbuk, 573-701, Korea

Correspondence to:

Kangjoo Kim

kangjoo@kunsan.ac.kr

Received: September 30, 2008; Accepted: December 24, 2008

Abstract

As-rich alluvial groundwaters occurring in the agricultural area of Mankyeong River watershed were geochemically studied. 15 out of 29 investigated wells (52%) showed As levels exceeding the WHO drinking water standard (10 μg/L). Their chemistry is characterized by low Eh levels, low NO3 and SO4 concentrations, and high pH, alkalinity, Fe, NH4, and PO4 levels. This suggests that arsenic is enriched by the reductive dissolution of As-bearing Fe-/Mn-(hydro)oxides, the commonest process in Bangladesh and West Bengal of India, of which groundwaters are severely contaminated by As. It was also revealed that As concentrations in the area are strongly regulated by the presence of agrochemicals such as NO3 and SO4.

Keywords arsenic, groundwater, alluvial aquifer, reductive dissolution of Fe (hydro)oxide, agrochemicals

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

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