Journal of the Korean Geographical Society (대한지리학회지)

The Korean Geographical Society (대한지리학회)
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Comparisons of Grain Size Analysis Results by Different Pretreatments Procedures in Loess-paleosol Sediments

뢰스-고토양 퇴적물의 전처리 과정에 따른 입도분석 결과 비교

  • Yoon, Soon-Ock (Department of Geography and Research Institute for Basic Sciences, Kyung Hee University) ;
  • Park, Chung-Sun (Department of Geogmphy, Kyung Hee University) ;
  • Hwang, Sang-Ill (Department of Geography, Kyungpook National University)
  • 윤순옥 (경희대학교 지리학과 및 기초과학연구소) ;
  • 박충선 (경희대학교 지리학과) ;
  • 황상일 (경북대학교 지리학과)
  • Received : 2010.10.03
  • Accepted : 2010.10.16
  • Published : 2010.10.31
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Abstract

Grain size analysis of sediments and soils has been regarded as a one of the most important analytical methods in Earth Sciences. The results of grain size analysis by 10 different pretreatment procedures in loess-paleosol sediments are compared in the study. In spite of the most powerful effectiveness of dispersant(sodium hexametaphosphate) on the dispersions of sediments, the effects show large differences by its treatment orders with HCl. It may result from that $Na^+$ ions in the dispersant may not be able to effectively substitute $Ca^{2+}$ ions in the sediments due to the electrostatic forces between $Na^+$ and $Cl^-$ ions in the dispersant and HCl, respectively. Although $H_2O_2$ and HCl are more effective in dispersion than hot water, they do not affect greatly the dispersions. Therefore, the reliable results of grain size analysis can be obtained by selecting the adequate pretreatment procedures most suitable for the purposes of researches and characteristics of sediments.

퇴적물이나 토양의 입도분석은 가장 중요하고 기초적인 지구과학적 연구방법 중 하나이다. 본 연구는 뢰스-고토양 퇴적물을 대상으로 10가지 전처리 과정에 따른 입도분석 결과의 차이를 비교하였다. 퇴적물의 분산에 있어 확산제의 효과가 가장 크지만, 확산제와 염산의 처리 순서에 따라 큰 차이를 보인다. 이는 염산의 염소 이온과 확산제의 나트륨 이온 사이의 정전기적 인력으로 인해, 나트륨 이온이 효과적으로 퇴적물의 칼슘 이온을 치환하지 못하기 때문으로 생각된다. 또한 과산화수소와 염산은 끓는 물보다는 효과적이지만 퇴적물의 분산에 큰 영향을 미치지 않는다. 따라서 연구 목적 및 시료 특성에 맞는 적절한 방법을 선정해야 신뢰할 수 있는 입도분석 결과를 얻을 수 있을 것이다.

Keywords

Acknowledgement

Supported by : 기상청

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