Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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A Study of Interference Factor of Analysis Method of Hexavalent Chromium in Soil using UV/VIS Spectrometry and Application of Ion Chromatography

자외선/가시선 분광법을 이용한 토양 중 6가 크롬 분석방법의 방해요인 분석 및 이온크로마토그래피 적용에 관한 연구

  • Noh, Hoe-Jung (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Lee, Myung-Gyu (Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Hyeon Seok (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Kim, Mira (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Kim, Dongho (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Kim, Tae Seung (Soil and Groundwater Research Division, National Institute of Environmental Research)
  • 노회정 (국립환경과학원 토양지하수연구과) ;
  • 이명규 (한국세라믹기술원) ;
  • 이현석 (국립환경과학원 토양지하수연구과) ;
  • 김미라 (국립환경과학원 토양지하수연구과) ;
  • 김동호 (국립환경과학원 토양지하수연구과) ;
  • 김태승 (국립환경과학원 토양지하수연구과)
  • Received : 2012.03.09
  • Accepted : 2012.11.01
  • Published : 2012.12.31
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Abstract

This study was performed to find the problems according to interference factors (organic matter, pH, Cr, Mn, Fe, clay, and etc.) when we analyzed the hexavalent chromium [Cr(VI)] in soils using UV/VIS spectrometer (US EPA 7196A), attempted to evaluate the domestic applicability of analytical method (US EPA 7199) using IC-UV/VIS spectrometer as alternative method. The recovery rate of certified reference materials was 75.0% (US EPA 7196A) and 101.4% (US EPA 7199) by the analytical methods. As the results of performing QA/QC about US EPA 7199, method detection limit (MDL) and limit of quantification (LOQ) were 0.062 mg/kg, 0.196 mg/kg, respectively. The LOQ of US EPA 7199 was lower than that of the current soil official testing method in Korea (0.5 mg/kg). Cr(VI) contents in 23 soil samples were compared by the analytical methods of EPA 7196A and 7199. Cr(VI) was detected in 13 of 23 soil samples by EPA 7196A, while EPA 7199 was not detected in any soil samples. The Cr(VI) content in 23 soil samples by EPA 7196A was not clearly correlated with Cr, Fe, Mn and clay content in the soil samples. However, the contents of Cr(VI) and organic matter of the soil samples had the highest coefficient of determination ($R^2$) of 0.80. In order to evaluate the correlation between the recovery rates of Cr(VI) and organic matter contents in the soil samples, the recovery rates of 5 soil samples added Cr(VI) standard solution were analyzed by the analytical methods. According to the results, the higher the organic matter contents in soil samples, the lower the recovery rates of Cr(VI) by US EPA 7196, while in case of US EPA 7199, the recovery rates were stable regardless of the organic matter contents.

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