Method for detecting organic components of soil by utilizing near infrared spectrum

A near-infrared spectroscopy and soil technology, which is applied in the field of detecting the chemical composition of soil organic matter, can solve the problems of special operation, expensive equipment, and high technical requirements, and achieve the effects of strong popularity, simple operation, and wide application range

Inactive Publication Date: 2016-07-13
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many advantages mentioned above, the use of NMR to analyze the SOM structure also has some disadvantages: such as expensive instruments, time-consuming sample processing, long test cycle, special operation, high test cost, and difficulty in large-scale promotion, etc.
For example, with cross-polarization and spin magic-angle 13 C solid-state nuclear magnetic resonance spectroscopy (CP-MAS 13 CNMR) research on soil organic matter structure has the following disadvantages: 1. The instrument is expensive and the test cost is high; 2. The technical requirements are high and it is not easy to operate; 3. The test time is long (a sample often needs more than 24h); 4. The pretreatment is time-consuming ( Processing a sample requires several times of hydrofluoric acid treatment, water washing, and the final sample freeze-drying, which often takes several days); 5. It is not easy to promote
In addition, because it uses a linear method (such as the least square method) to establish a calibration model, the prediction accuracy is not high enough (the prediction correlation coefficients of many functional group carbons are lower than 0.80)

Method used

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  • Method for detecting organic components of soil by utilizing near infrared spectrum
  • Method for detecting organic components of soil by utilizing near infrared spectrum
  • Method for detecting organic components of soil by utilizing near infrared spectrum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Prediction of Alkyl Carbon Relative Content in Example 1 Soil Organic Matter

[0064] (1) Prepare the soil sample to be tested. Remove impurities from the mineral layer soil, air-dry, pulverize, pass through a 60-mesh sieve, and store in a desiccator for future use. A total of 56 samples came from different depths (0-2, 2-5, 5-10, 0-2, 2-5, 5-10, 10-20cm) of soil samples.

[0065] (2) Using CP-MAS 13 The relative content of alkyl carbon in soil organic matter was measured by CNMR method. The soil samples were first pretreated with a hydrofluoric acid solution to remove some of the paramagnetic minerals and concentrate the organic matter. Soil samples treated with hydrofluoric acid were 13 C Solid state NMR analysis. The peaks in 0-50ppm on the NMR spectrum can be attributed to the alkyl carbon in SOM. After spectral processing such as phase correction and baseline correction, this band is integrated, and then the relative content of alkyl carbon in SOM can be obt...

Embodiment 2

[0075] Prediction of relative content of alkoxycarbon in embodiment 2 soil organic matter

[0076] (1) Prepare the soil sample to be tested. Remove impurities from the mineral layer soil, air-dry, pulverize, pass through a 60-mesh sieve, and store in a desiccator for future use. A total of 56 samples came from different depths (0-2, 2-5, 5-10, 0-2, 2-5, 5-10, 10-20cm) of soil samples.

[0077] (2) Using CP-MAS 13 The relative content of alkoxycarbons in soil organic matter was measured by CNMR method. The soil samples were first pretreated with a hydrofluoric acid solution to remove some of the paramagnetic minerals and concentrate the organic matter. Soil samples treated with hydrofluoric acid were 13 C Solid state NMR analysis. The spectral peaks in 50-110ppm on the nuclear magnetic spectrum can be attributed to the alkoxycarbons in SOM. After spectrogram processing such as phase correction and baseline correction, this band is integrated, and then the relative conten...

Embodiment 3

[0085] Example 3 Prediction of Relative Aromatic Carbon Content in Soil Organic Matter

[0086] (1) Prepare the soil sample to be tested. Remove impurities from the mineral layer soil, air-dry, pulverize, pass through a 60-mesh sieve, and store in a desiccator for future use. A total of 56 samples came from different depths (0-2, 2-5, 5-10, 0-2, 2-5, 5-10, 10-20cm) of soil samples.

[0087] (2) Using CP-MAS 13 The relative content of aromatic carbon in soil organic matter was measured by CNMR method. The soil samples were first pretreated with a hydrofluoric acid solution to remove some of the paramagnetic minerals and concentrate the organic matter. Soil samples treated with hydrofluoric acid were 13 C Solid state NMR analysis. The spectral peaks at 110-160ppm on the NMR spectrum can be attributed to the aromatic carbon in SOM. After spectrogram processing such as phase correction and baseline correction, this band is integrated, and then the relative content of aromat...

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Abstract

The invention provides a method for detecting organic components of soil by utilizing a near infrared spectrum. The method comprises the following steps: (1) detecting organic matter chemical compositions of a plurality of calibrated soil samples; (2) acquiring diffuse reflection spectrograms of near infrared wavebands of the calibrated soil samples to obtain original spectrograms; (3) carrying out smooth pre-processing on the original spectrograms to obtain processed spectrograms; (4) establishing a quantitative relationship model between the processed spectrograms of the calibrated soil samples and the organic matter chemical compositions by adopting a vector machine method; and (5) acquiring diffuse reflection spectrograms of near infrared wavebands of soil samples to be detected, and detecting the organic matter chemical compositions of the soil samples to be detected according to the quantitative relationship model. The method provided by the invention can be used for rapidly and accurately detecting the organic matter chemical compositions of the soil to be detected by utilizing the near infrared spectrum.

Description

technical field [0001] The invention relates to the field of ecology, in particular to a method for detecting the chemical composition of soil organic matter. Background technique [0002] Soil organic matter (SOM) plays an important role in maintaining soil microorganisms, normal life activities of animals and plants, maintaining soil fertility and buffering properties, and regulating environmental climate. The key to studying SOM is to deeply understand its chemical composition and structure. The structure of SOM can be studied by chemical methods, pyrolysis mass spectrometry, solid-state carbon 13 nuclear magnetic resonance, etc. Among them, the cross-polarization and spin magic-angle 13 C solid-state nuclear magnetic resonance spectroscopy (Solid-state 13 CNuclear Magnetic Resonance with cross-polarization and magic angles spinning, CP-MAS 13 CNMR), because it does not need to extract organic matter by chemical or other methods, and can provide more comprehensive info...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/359
CPCG01N21/359
Inventor 喻文娟王瑞斌康宏樟刘星吴节莉代傅娜吴玉森
Owner SHANGHAI JIAO TONG UNIV
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