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Article

An Assessment of Heavy Metal Contamination in the Nakdong River Around the Weir

Department of Environmental Science and Engineering, Ewha Womans University, 52, Seoul 03760, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Bulgariu Laura
Water 2021, 13(5), 684; https://doi.org/10.3390/w13050684
Received: 14 January 2021 / Revised: 19 February 2021 / Accepted: 1 March 2021 / Published: 3 March 2021
(This article belongs to the Special Issue Geochemical Water Monitoring)
In this study, the concentrations and characteristics of copper (Cu), zinc (Zn), and lead (Pb) contamination in sediment samples were investigated using aqua regia extraction and Tessier’s five-step sequential extraction. Based on the concentration of metals, the influence of the Hapcheon-Changnyeong weir on sediments in the Nakdong River was assessed. The origins of the contaminants, their bioavailability, and their mobility were determined using sequential extraction. Greater concentrations of heavy metals were found in samples collected closer to the weir. The largest proportion of Cu was identified in the residual fraction based on sequential extraction, whereas Zn was predominantly found in the reducible fraction. Iron-manganese in the reducible fraction of Zn has the potential to leach back to the water body. In addition, the combined concentration of fractions 1 and 2 of Cu comprised more than 20% of total amount that still has potential to affect the water quality. The results of this study were compared with existing sediment standards set out by the NIER (National Institute of Environmental Research), Canada, and US EPA (United States Environmental Protection Agency) guidelines, as well as the risk assessment code (RAC). The concentrations of heavy metals exceeded the standards set by the Canadian guideline by up to four times in particular samples, highlighting the need for continual monitoring. View Full-Text
Keywords: heavy metal; surface water quality; aqua regia extraction; sequential extraction; monitoring; water contaminants heavy metal; surface water quality; aqua regia extraction; sequential extraction; monitoring; water contaminants
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MDPI and ACS Style

Son, H.W.; Shim, S.H.; Oh, H.; Choi, J.H. An Assessment of Heavy Metal Contamination in the Nakdong River Around the Weir. Water 2021, 13, 684. https://doi.org/10.3390/w13050684

AMA Style

Son HW, Shim SH, Oh H, Choi JH. An Assessment of Heavy Metal Contamination in the Nakdong River Around the Weir. Water. 2021; 13(5):684. https://doi.org/10.3390/w13050684

Chicago/Turabian Style

Son, Hee Won, Sun Hee Shim, Haeseong Oh, and Jung Hyun Choi. 2021. "An Assessment of Heavy Metal Contamination in the Nakdong River Around the Weir" Water 13, no. 5: 684. https://doi.org/10.3390/w13050684

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