Estimation of Soil Nitrate (NO3) Level Using Laser-Induced Breakdown Spectroscopy (LIBS)

2nd International Conference on Agricultural Engineering for Sustainable Agricultural Production

Angkat, A.R.^1 ; Seminar, K.B.^1 ; Rahmat, M.^2 ; Sutandi, A.^3

Department of Mechanical and Biosystem Engineering, Bogor Agricultural University, Indonesia^1

Department of Mechanical Engineering, Ibnu Khaldun University, Indonesia^2

Department of Soil and Land Resources, Bogor Agricultural University, Indonesia^3

关键词: Determination coefficients;    Laserinduced breakdown spectroscopy (LIBS);    Nitrate contents;    Rapid measurement;    Repetition rate;    Second derivatives;    Spectrum characterizations;    Wavelength ranges;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/147/1/012045/pdf
DOI  :  10.1088/1755-1315/147/1/012045

来源: IOP

【 摘 要 】

Laser-Induced Breakdown Spectroscopy (LIBS) is a method for measuring level of nitrogen (N) in the soil in the form of N-nitrate (NO3) rapidly without going through the process of sieving and drying. The sample soil in the form of pellets subjected to laser pulses using a wavelength of 532 nm, pulse duration 5.5 ns, repetition rate of 10 Hz, and Q-switch delay of 150 μs. Emissions are captured by the spectrometer with the wavelength range of 190-1130 nm. Spectrum characterization was processed through the second derivative in order to obtain a wavelength identity that could be rapidly used to estimate the nitrate content of the soil with a determination coefficient of (R2) 0.9254 and a coefficient of variation (CV) of 8.41%. The results of this study are very potential to be applied for rapid measurement of soil nitrate.