Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Natural Background and Enrichment Characteristics of the Stream Sediments from the Hamyang-Sancheong Area

함양-산청지역 하상퇴적물의 자연배경치 및 부화특성

  • Published : 2009.06.28
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Abstract

We investigated natural background and enrichment characteristics and predicted geochemical disaster for stream sediments in the Hamyang-Sancheong area. Stream sediments samples were collected 95 ea in study area. The stream sediments were well known that had not possibility of contamination effect and represented drainage basins. We got the major and hazardous elements concentrations by XRF, ICP-AES and NAA analysis methods. Acid decomposition for the ICP-AES has been used $HClO_4$ and HF with $200^{\circ}C$ heating at 1st and after that $HClO_4$ HF and HCl with $200^{\circ}C$ heating at 2nd stage. We could know the characteristics that concentration of Cu and Co decreased when concentration of $SiO_2$ increased in correlation analysis. The enrichment factor of the stream sediments was below 2 in study area. This result indicated that study area belonged to moderate enrichment. The stream sediments of Hamyang area were enriched in order of Pb>Th>Cr>V>Co>Cu and those of Sancheong area were enriched in order of Pb>Th>Cr>Co>V>Cu. The enrichment factor(E.F.) of the Pb, Cr, Co and V was similar between Hamyang and Sancheong area. The enrichment factor of the Th was higher in Hamyang area and that of the Cu was higher in Sancheong area. The enrichment factor of the Pb was highly enriched in all study area than earth crust mean. But we could know that study area was not exposed to the pollution of the Pb through the tolerable level.

함양-산청지역 하상퇴적물의 자연배경치와 부화특성을 알아보고, 지구화학적 재해에 대해 예견하였다. 오염의 우려가 없고, 집수분지를 대표할 수 있는 하상퇴적물 시료를 채취하였다. XRF, ICP-AES와 NAA 분석을 이용하여 주성분원소와 유해원소 함량을 얻었다. 산분해법은 1차로 $HClO_4$와 HF를 혼합하여 $200^{\circ}C$에서 분해시킨 후, 2차로 $HClO_4$, HF 및 HCl를 혼합한 후 $200^{\circ}C$에서 분해시켜 이를 1% $HNO_3$용액으로 만들었다. 상관분석에서 하상퇴적물의 $SiO_2$ 함량이 증가할수록 Cu와 Co의 함량이 감소하는 특징을 보임을 알 수 있었다. 함양-산청내 환경유해원소 대부분 부화지수 2 이하로 부화되어 있었으며, 함양지역 하상퇴적물은 Pb>Th>Cr>V>Co>Cu순으로, 산청지역 하상퇴적물은 Pb>Th>Cr>Co>V>Cu순으로 부화되어 있었다. Pb, Cr, Co 및 V의 부화지수는 함양지역과 산청지역에서 거의 비슷한 부화특성을 보였으나, Th의 부화지수는 함양지역 지역에서, Cu의 부화지수는 산청지역에서 높은 부화특성을 보였다. Pb의 부화지수는 각각 2.24(함양), 2.57(산청) 이상으로 부화되어 있었지만, 토양 및 환경오염 허용 한계치(tolerable level)를 이용하여 살펴본 결과에서는 오염에 특별히 노출되지 않은 것으로 판단된다.

Keywords

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