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Evaluation of Exposure Indicators for Plants by Silicon Tetrachloride Release

사염화규소 누출사고지점 주변 식물에 대한 노출지표 평가

  • Park, Jae-Seon (Department of Earth System Sciences, College of Science, Yonsei University) ;
  • Kim, Jee-Young (Monitoring and Analysis Division, Wonju Regional Environmental Office, Ministry of Environment) ;
  • Kim, Myeong-Ock (Environmental Measurement & Analysis Center, Fundamental Environment Research Department, National Institute of Environmental Research) ;
  • Park, Hyun-Woo (Environmental Measurement & Analysis Center, Fundamental Environment Research Department, National Institute of Environmental Research) ;
  • Chung, Hyen-Mi (Fundamental Environment Research Department, National Institute of Environmental Research) ;
  • Choi, Jong-Woo (Environmental Measurement & Analysis Center, Fundamental Environment Research Department, National Institute of Environmental Research)
  • 박재선 (연세대학교 이과대학 지구시스템과학과) ;
  • 김지영 (환경부 원주지방환경청 측정분석과) ;
  • 김명옥 (국립환경과학원 환경기반연구부 환경측정분석센터) ;
  • 박현우 (국립환경과학원 환경기반연구부 환경측정분석센터) ;
  • 정현미 (국립환경과학원 환경기반연구부) ;
  • 최종우 (국립환경과학원 환경기반연구부 환경측정분석센터)
  • Received : 2017.11.15
  • Accepted : 2017.11.23
  • Published : 2017.12.31

Abstract

BACKGROUND: Silicon tetrachloride reacts with moisture in the atmosphere to generate hydrogen chloride, which affects the environment. Since silicon tetrachloride and its by-products are dispersed in the atmosphere in a short time after the silicon tetrachloride release into the atmosphere, it is difficult to directly assess the extent of environmental impact. In the present study, the exposure test of silicon tetrachloride or hydrogen chloride was examined in order to establish the criterion of the range affected by the silicon tetrachloride release, and the actual crops in the area exposed to silicon tetrachloride leakage were analyzed. METHODS AND RESULTS: For the experiment of exposure to silicon tetrachloride or hydrogen chloride, the leaves of red-pepper and corn were used in glass sealed containers. In the actual accident area, 59 samples from 10 different kinds of crops were collected. The pretreatment of the sample was performed by freezing and grinding, and then extracted using distilled water. The pH and concentration of chloride ($Cl^-$) ion of the extracted solution were measured using pH meter and ion chromatograph, respectively. CONCLUSION: Exposure to silicon tetrachloride caused visible damage, increasing the concentration of chloride ion, and decreasing the pH as well as hydrochloric acid. In the actual crops of the affected area, the tendency was the same as the result of the laboratory test, and the range of influence could be estimated through the concentration of $Cl^-$ ion over 2,000 mg/kg, and the correlation evaluation between the concentration of $Cl^-$ and pH. Therefore, the concentration of $Cl^-$ ion and the correlation between $Cl^-$ and pH would be considered as the factors to estimate the influence range of silicon tetrachloride release.

Keywords

References

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