대도시 주변 강과 하천에서 인위적기원 gadolinium의 유입

Title
대도시 주변 강과 하천에서 인위적기원 gadolinium의 유입
Alternative Title
Substantial gadolinium enrichments in lake and river near metrocities in Korea
Author(s)
김인태
KIOST Author(s)
Kim, Intae(김인태)
Publication Year
2019-12-12
Abstract
We measured dissolved rare earth elements (REEs) in the water samples from Shihwa Lake (SL), which was assumed to be highly polluted, as well as in the downstream portion of the Han River (HR), which runs through, Seoul, Korea. Among the investigated REEs, only Gadolinium (Gd) was found to be significantly enhanced after REE concentrations were shale-normalized (SN). The calculated Gd anomaly (Gd/Gd* = 3×GdSN/(SmSN + 2×TbSN)) was about 1.5±0.1 (n=16) in SL and 1.6±0.3 in HR (n=26) water relative to other types of natural water such as groundwater, seawater, and river water in uncontaminated areas (Gd/Gd*~1.2, n>400). These significant Gd anomalies seem to be due to the inputs of anthropogenic Gd (Gdanth),especially by the use of Gd-based contrast agents for magnetic resonance imaging (MRI) tests from a number of hospitals and medical institutes surrounding our study areas. The Gdanth inventory was estimated to be 190±80 g and 680±360 kg Gd in SL and the HR (watersheds in our study area), respectively. The Gdanth flux to the Yellow Sea from the HR is estimated to be 530±330 g Gd day-1. Overall, these results suggest that quantitative evaluation of man-made REEs for associated human risk assessments are needed, because considerable amounts of REEs are now used by modern high-tech industries.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/21025
Bibliographic Citation
2019 AGU Fall Meeting, pp.1, 2019
Publisher
American Geophysical Union
Type
Conference
Language
English
Publisher
American Geophysical Union
Related Researcher
Research Interests

Chemical Oceanography,Environmental Radiochemistry,Environmental Chemistry,화학해양학,환경방사능화학,환경분석화학

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