Nitrate Determination in Soil Pastes using Attenuated Total Reflectance Mid-infrared Spectroscopy: Improved Accuracy via Soil Identification

Linker, Raphael; Weiner, Myron; Shmulevich, I.; Shaviv, A.

doi:10.1016/j.biosystemseng.2006.01.014

Cited by 44 publications

(38 citation statements)

References 10 publications

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“…In this case the results are much more consistent, with R 2 values of 0.95 or more reported in the studies of Janik&Skjemstad (1995), Bertrand et al (2002), Canasveras et al (2010) and Du et al (2008b). Linker et al (2006) and Du et al (2008a) showed that the spectral information related to carbonate and other soil constituents can be used to discriminate between soils, and Linker et al (2006) further showed that such a automatic discrimination can improve the estimation of nutrients such as nitrate.…”

Section: Soil Characterizationmentioning

confidence: 99%

Application of FTIR Spectroscopy to Agricultural Soils Analysis

Linker¹

2011

Fourier Transforms - New Analytical Approaches and FTIR Strategies

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Section: Soil Characterizationmentioning

confidence: 99%

Application of FTIR Spectroscopy to Agricultural Soils Analysis

Linker¹

2011

Fourier Transforms - New Analytical Approaches and FTIR Strategies

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“…[10][11][12][13] They found that the most accurate measurements required first determining the type of soil and then applying a calibration specifically for that soil type. 11,13 They used a combination of principal component analysis and neural networks to identify the soil type and then partial least squares (PLS) to determine the nitrate concentration, resulting in determination errors of 6.2-13.5 mg N/kg soil (dry basis), depending on the soil type. 13 Choe et al 14 have also used ATR FT-IR of soil pastes to determine nitrate concentrations.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Sensing of Soil Nitrate Concentration in the Parts per Million Range While the Soil is in Motion

et al. 2013

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Reactive nitrogen (Nr) is a term used to describe non-nitrogen gas (non-N2) forms of nitrogen (N) in the biosphere. It causes major pollution problems when it occurs in excess, and it has many sources, including fertilizers used in production agriculture. Currently there is no on-the-go soil nitrate sensor that could guide the application of the optimal amount of fertilizer, which often varies significantly within a field. We report for the first time nitrate-in-soil measurements performed on moving soil samples at concentration levels relevant for fertilizer application. An infrared emission technique called transient infrared spectroscopy (TIRS) was tested on soil samples spiked with different nitrate concentrations in the parts-per-million range and moving at a velocity of 2.6 m/s (5.8 miles per hour) in the laboratory. The TIRS Fourier transform infrared (FT-IR) spectra were modeled by partial least squares and produced a standard error of cross-validation (SECV) of 6.3 parts per million (ppm) N and an R 2 of 0.938 for 512-scan spectra. These results are compared to those using fewer TIRS scans and to those from photoacoustic spectroscopy (PAS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurements on stationary samples. TIRS 128-, 32-, and 8-scan spectra yielded SECVs of 11.2, 11.4, and 18.4 ppm N and R 2 values of 0.800, 0.831, and 0.583, respectively. The PAS and DRIFTS measurements produced SECVs of 12.4 and 9.0 ppm N and R 2 values of 0.766 and 0.876, respectively. Reactive nitrogen (Nr) is a term used to describe non-nitrogen gas (non-N 2 ) forms of nitrogen (N) in the biosphere. It causes major pollution problems when it occurs in excess, and it has many sources, including fertilizers used in production agriculture. Currently there is no on-the-go soil nitrate sensor that could guide the application of the optimal amount of fertilizer, which often varies significantly within a field. We report for the first time nitrate-in-soil measurements performed on moving soil samples at concentration levels relevant for fertilizer application. An infrared emission technique called transient infrared spectroscopy (TIRS) was tested on soil samples spiked with different nitrate concentrations in the parts-per-million range and moving at a velocity of 2.6 m/s (5.8 miles per hour) in the laboratory. The TIRS Fourier transform infrared (FT-IR) spectra were modeled by partial least squares and produced a standard error of cross-validation (SECV) of 6.3 parts per million (ppm) N and an R 2 of 0.938 for 512-scan spectra. These results are compared to those using fewer TIRS scans and to those from photoacoustic spectroscopy (PAS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurements on stationary samples. TIRS 128-, 32-, and 8-scan spectra yielded SECVs of 11.2, 11.4, and 18.4 ppm N and R 2 values of 0.800, 0.831, and 0.583, respectively. The PAS and DRIFTS measurements produced SECVs of 12.4 and 9.0 ppm N and R 2 values of 0.766 and 0.876, respective...

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“…As the interest in precision agriculture (PA) and the maintenance of a safe and healthy environment increases, so does the need for direct and fast monitoring methods for nutrients in soils (Shaviv et al 2003;Linker et al 2005;Linker et al 2006). Nitrate is one of the inorganic fertilizers required for implementation of PA (Linker 2004), and there are many researches on the link between intensive agriculture and nitrate pollution (Al-Darby and Abdel-Nasser 2006).…”

Section: Introductionmentioning

confidence: 99%

An Alternate Method for Fourier Transform Infrared (FTIR) Spectroscopic Determination of Soil Nitrate Using Derivative Analysis and Sample Treatments

Choe

Meer

Rossiter³

et al. 2009

Water Air Soil Pollut

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This study aimed at examining effective sample treatments and spectral processing for an alternate method of soil nitrate determination using the attenuated total reflectance (ATR) of Fourier transform infrared (FTIR) spectroscopy. Prior to FTIR measurements, soil samples were prepared as paste to enhance adhesion between the ATR crystal and sample. The similar nitrate peak heights of soil pastes and their supernatants indicated that the nitrate in the liquid portion of the soil paste mainly responded to the FTIR signal. Using a 0.01-M CaSO 4 solution for the soil paste, which has no interference bands in the characteristic spectra of the analyte, increased the concentration of the nitrates to be measured. Secondorder derivatives were used in the prediction model to minimize the interference effects and enhance the performance. The second-order derivative spectra contained a unique nitrate peak in a range of 1,400-1,200 cm −1 without interference of carbonate. A partial least square regression model using secondorder derivative spectra performed well (R 2 =0.995, root mean square error (RMSE) = 23.5, ratio of prediction to deviation (RPD)=13.8) on laboratory samples. Prediction results were also good for a test set of agricultural field soils with a CaCO 3 concentration of 6% to 8% (R 2 =0.97, RMSE=18.6, RPD= 3.5). Application of the prediction model based on soil paste samples to nitrate stock solution resulted in an increased RMSE (62.3); however, validation measures were still satisfactory (R 2 =0.99, RPD=3.0).

show abstract

Nitrate Determination in Soil Pastes using Attenuated Total Reflectance Mid-infrared Spectroscopy: Improved Accuracy via Soil Identification

Cited by 44 publications

References 10 publications

Application of FTIR Spectroscopy to Agricultural Soils Analysis

Application of FTIR Spectroscopy to Agricultural Soils Analysis

Real-Time Sensing of Soil Nitrate Concentration in the Parts per Million Range While the Soil is in Motion

An Alternate Method for Fourier Transform Infrared (FTIR) Spectroscopic Determination of Soil Nitrate Using Derivative Analysis and Sample Treatments

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