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- W1968778867 abstract "Abstract Fourier transform infrared attenuated total reflection (FTIR-ATR) spectroscopy was utilized to quantify nitrate contents, 14NO3-N and 15NO3-N in KNO3 solution and soil. The results showed that the characteristic band of nitrate in solution and soil was 1200–1500 cm−1, and about 35 cm−1 of red shift was observed in the characteristic band of 15NO3− compared with 14NO3−. The intensity of the characteristic band of nitrate increased with the nitrate concentration and with less interference involved. The linear regression was made between the first principal component of characteristic band and nitrate-N content with a correlation coefficients of 0.9840, which indicated that FTIR-ATR spectroscopy was feasible for rapid monitoring of nitrate in solution and soil. Furthermore, based on the red shift of 15NO3− absorption, partial least squares (PLS) method was employed to predict the nitrate -N labeled with different N-isotope in solution and soil. As a result, all the prediction models were excellent. For 14NO3-N and 15NO3-N in solution, the determination coefficients (R2) were 0.9980 and 0.9982, respectively, and corresponding RPD were 6.44 and 4.76, respectively. For 14NO3-N and 15NO3-N in soil, the determination coefficients (R2) were 0.9794 and 0.9679, respectively, and the corresponding RPD were 5.75 and 4.78, respectively. Therefore, FTIR-ATR spectroscopy can be applied for rapid monitoring different N-isotope labeled nitrate in solution and soil, which provides a new method for in situ and fast analysis of nitrification process in soil." @default.
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- W1968778867 date "2014-05-01" @default.
- W1968778867 modified "2023-09-27" @default.
- W1968778867 title "Rapid Determination of N Isotope Labeled Nitrate Using Fourier Transform Infrared Attenuated Total Reflection Spectroscopy" @default.
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- W1968778867 doi "https://doi.org/10.1016/s1872-2040(13)60734-3" @default.
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