Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Characteristics of composition and surface morphology of soil particles influenced by inorganic acids with different acidity

산해리도가 다른 무기산에 의한 토양 입자 표면 특성

  • Lee, Dong-Sung (Department of Bio-Environmental Chemistry, College of Agriculture and Life science, Chungnam National University) ;
  • Lee, Kyo-suk (Department of Bio-Environmental Chemistry, College of Agriculture and Life science, Chungnam National University) ;
  • Shin, Ji-Soo (Department of Bio-Environmental Chemistry, College of Agriculture and Life science, Chungnam National University) ;
  • Lee, Jae-Bong (Department of Bio-Environmental Chemistry, College of Agriculture and Life science, Chungnam National University) ;
  • Joo, Ri-Na (Department of Bio-Environmental Chemistry, College of Agriculture and Life science, Chungnam National University) ;
  • Lee, Myong-Youn (Department of Bio-Environmental Chemistry, College of Agriculture and Life science, Chungnam National University) ;
  • Min, Se-Won (Daejeon Doonsan Girl's High School Daejeon) ;
  • Chung, Doug-Young (Department of Bio-Environmental Chemistry, College of Agriculture and Life science, Chungnam National University)
  • 이동성 (충남대학교 농업생명과학대학 생물환경화학과) ;
  • 이교석 (충남대학교 농업생명과학대학 생물환경화학과) ;
  • 신지수 (충남대학교 농업생명과학대학 생물환경화학과) ;
  • 이재봉 (충남대학교 농업생명과학대학 생물환경화학과) ;
  • 주리나 (충남대학교 농업생명과학대학 생물환경화학과) ;
  • 이명연 (충남대학교 농업생명과학대학 생물환경화학과) ;
  • 민세원 (대전둔산여자고등학교) ;
  • 정덕영 (충남대학교 농업생명과학대학 생물환경화학과)
  • Received : 2015.08.05
  • Accepted : 2015.09.10
  • Published : 2015.09.30
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Abstract

We conducted this research to observe the changes of surface morphology and composition of clay minerals influenced by various concentrations of fluoric acid. Hydrofluoric acid (HA), a solution of hydrogen fluoride (HF) in water, is a colourless solution that is highly corrosive, capable of dissolving many materials, especially oxides. To do this, we treated several concentrations of HA on the ground soil samples collected from the agricultural experimental station located at Chungnam National University to observe the influence of fluoric acid on the changes of surface structures and elemental composition of clay particles. Generally, microscopic examination showed that the HA can not only attack an edge of clay particles but also start at any point where structural defects and weaknesses predisposed sites to acid. The orderly flake arrangement of clay minerals may reflect certain crystal symmetry elements. The ESEM-EDS results of element composition of clay particles influenced by HA indicated the changes of structures of clay minerals. It is also clear from the formation of etch figures and element composition of clay particles that the product layer at least partially dissolved or disintegrated in the presence of acid. Conclusively, the clay structures can be strongly influenced by concentrations of HA, resulting in changes of physical and chemical properties that can determine the behavior of solute transport as well as mobility of ions in soils.

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