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한국지구과학회
The Korean Earth Science Society

pISSN : 1225-6692  |  eISSN : 2287-4518



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kess64, vol. 42, no. 4, pp.412-424, August, 2021

DOI. https://doi.org/10.5467/JKESS.2021.42.4.412

Distribution of Heavy Metals in Sediment Cores Collected from the Nakdong River, South Korea

Ntahokaja Magalie1,2,†, Jiyeong Lee1,2,†, Jihye Kang2, Jeonghoon Kim1,2, Ho-Jin Park2, Sang Yeol Bae1,2, Seok Jeong1,2, Young-Seog Kim1,2, and Jong-Sik Ryu1,2,*
1Division of Earth Environmental System Sciences, Pukyong National University, Busan 48513, Korea 2Department of Earth and Environmental Sciences, Pukyong National University, Busan 48513, Korea

Abstract

Understanding the distribution of heavy metals in sediment is necessary because labile heavy metals can partition into the water column and bioaccumulate in aquatic organisms. Here we investigated six heavy metals (Co, Cu, Mn, Ni, Pb, and Zn) in sediment cores using a five-step sequential leaching method to examine the occurrence of heavy metals in the sediment. The results showed that all elements, except Mn, are depleted in the exchangeable and carbonate fractions. However, heavy metal concentrations are much higher in the Fe-Mn oxide and organic matter fractions, especially for Cu, indicating enrichment in the organic matter fraction. Furthermore, contamination parameters (contamination factor and geoaccumulation index) indicate that Mn contamination is high, primarily derived from anthropogenic sources, presenting a potential risk to ecosystems in the Nakdong River.

Keyword

Nakdong River, sequential leaching, sediment core, heavy metal, manganese

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