Direct Determination of Soil Nitrate Using Diffuse Reflectance Fourier Transform Spectroscopy (DRIFTS)

중적외선 분광학을 이용한 토양 내의 질산태 질소 정량분석

  • Choe, Eunyoung (Soil & Fertilizer Management Division, National Academy of Agricultural Science, RDA) ;
  • Kim, Kyoung-Woong (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Hong, Suk Young (Soil & Fertilizer Management Division, National Academy of Agricultural Science, RDA) ;
  • Kim, Ju-Yong (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology)
  • 최은영 (농촌진흥청 국립농업과학원 토양비료관리과) ;
  • 김경웅 (광주과학기술원 환경공학과) ;
  • 홍석영 (농촌진흥청 국립농업과학원 토양비료관리과) ;
  • 김주용 (광주과학기술원 환경공학과)
  • Received : 2008.06.20
  • Accepted : 2008.08.03
  • Published : 2008.08.28

Abstract

Mid-infrared (MIR) spectroscopy, particularly Fourier transform infrared spectroscopy (FTIR), has emerged as an important analytical tool in quantification as well as identification of multi-atomic inorganic ions such as nitrate. In the present study, the possibility of quantifying soil nitrate via diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) without change of a sample phase or with least treated samples was examined. Four types of soils were spectrally characterized in terms of unique bands of soil contents and interferences with nitrate bands in the range of $2000-1000cm^{-1}$. In order to reduce the effects of soil composition on calibration model for nitrate, spectra transformed to the 1st order derivatives were used in the partial least squared regression (PLSR) model and the classification procedure associated with input soil types was involved in calibration system. PLSR calibration models for each soil type provided better performance results ($R^2$>0.95, RPD>6.0) than the model considering just one type of soil as a standard.

Acknowledgement

Supported by : Laboratory for Environmental-oriented Electrochemical Engineering (LEEE)

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