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KMID : 1024520170260030311
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Journal of the Environmental Sciences
2017 Volume.26 No. 3 p.311 ~ p.324
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Change in Geochemical Characteristics of Surface Sediments in the Nakdong River Main Stream
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Kim Shin
Lee Kwon-chul
Kim Ju-eon
Jung Kang-Young
Ahn Jung-Min
Kim Hyoung-Geun
Lee In-Jung
Shin Dong-Seok
Yang Duk-Seok
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Abstract
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To certificate change in the geochemical characteristics of surface sediments in the main stream of the Nakdong River, surface sediments from 12 sampling sites during the first and second half year (total 24 sampling sites) were collected and analyzed for grain size, ignition loss, total organic carbon and heavy metal content. Surface sediments mainly composed of sand (coarse and medium sand) and fining changed from the first half to the second half of the year. Ignition loss, total organic carbon and heavy metals content increased in the second half of the year. Some heavy metals (Zn, Ni and Cu) were found to be at the lowest effect levels according to Ontario sediment quality guidelines. Additionally, most heavy metals were found to be at the non polluted level and level I according to USEPA sediment quality standards and National Institute of Environmental Research sediment pollution evaluation standard, respectively. The enrichment factor (< 1) and index of geoaccmulation (< 0) were non polluted in the study area. The correlation analysis results showed that ignition loss, total organic carbon and heavy metal content were highly correlated with grain size. Regarding changes in geochemical characteristics of surface sediments in the study area, grain size fine and organic matter and heavy metal content increased in the second half year. Nonetheless these results indicated pollution levels that did not adversely affect the benthos.
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KEYWORD
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Nakdong River, Surface sediment, Grain size, Ignition loss, Total organic carbon, Heavy metal content
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