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Spectral Characteristics associated with Heavy Metal Concentration and Mineral Composition in Cropland and Rice Field Soils from Downstream of an Abandoned Coal Mine
폐석탄광 하류 밭토양 및 논토양의 중금속 함량과 광물조성에 따른 분광학적 특성
Econ. Environ. Geol. 2020 Dec;53(6):743-53
Published online December 31, 2020;  https://doi.org/10.9719/EEG.2020.53.6.743
Copyright © 2020 the Korean society of economic and environmental gelology.

Jihee Seo1, Jaehyung Yu2*, Sang-Mo Koh3 and Bum Han Lee3
서지희1 · 유재형2* · 고상모3 · 이범한3

1Department of Astronomy, Space Science, & Geology, Chungnam National University
2Departmentpf Geological Sciences, Chungnam National University
3Convergence research center for development of mineral resources (DMR), Korea Institute of Geoscience and Mineral Resources
1충남대학교 우주·지질학과, 2충남대학교 지질환경과학과, 3한국지질자원연구원 DMR융합연구단
Received October 12, 2020; Revised November 23, 2020; Accepted December 2, 2020.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
This study analyzed heavy metal concentration, mineral composition, and spectral characteristics of heavy metal contaminated soil samples of cropland and rice field located in downstream of abandoned Okdong coal mine. X-ray fluorescence analysis detected heavy metal elements including cadmium, copper, arsenic, lead, zinc and nickel in the soils. Both cropland and rice field samples were severely contaminated with arsenic showing higher concentration over the concerned standard. The pollution index of cropland samples was higher than that of rice field samples. X-ray powder diffraction analysis identified that the mineral composition of cropland and rice field samples is similar with quartz, calcite, kaolinite, illite, smectite, magnetite and hematite. The range of organic matter content were more widely distributed in cropland samples. The spectral analysis showed that the reflectance spectra and the absorption features of cropland and rice field samples were alike. The absorption features that appeared near 490nm and 900nm were attributed to the ferric iron, and clay minerals such as kaolinite and smectite caused the absorption features at 1410nm, 1910nm and 2200nm. The reflectance of the soil spectral decreased with an increase in organic content. The absorption depths of both types of soil samples decreased with higher organic matter content at 490nm and 1916nm as well as higher heavy metal concentration.
Keywords : Okdong Mine, cropland, rice field, heavy metal concentration, spectral characteristics

 

February 2021, 54 (1)