Method for detecting chemical composition of soil organic matter with mid-infrared spectra

A technology of chemical composition and infrared spectroscopy, applied in the field of ecology, can solve the problems of long test period, high test cost, and the need for special personnel to operate, and achieve the effect of improving prediction accuracy, improving prediction accuracy, and wide application range

Inactive Publication Date: 2016-07-20
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many advantages mentioned above, the use of nuclear magnetic resonance to analyze the SOM structure also has the following disadvantages: expensive instruments, time-consuming sample processing, long test cycle, special operation, high test cost, and difficulty in large-scale promotion, etc.
The difference between MIR and NIR spectroscopy is that near-infrared spectroscopy is the absorption of the double frequency and combined frequency of the internal vibration of the substance molecule. The bands of different components and functional groups are easy to overlap and the information intensity is weak, which makes the analysis of the spectrum relatively difficult. The model building is easily affected by external factors, and the stability is poor; while the mid-infrared spectrum is the fundamental frequency absorption of the molecular internal vibration, its information intensity is strong, and information extraction is relatively easy

Method used

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  • Method for detecting chemical composition of soil organic matter with mid-infrared spectra
  • Method for detecting chemical composition of soil organic matter with mid-infrared spectra
  • Method for detecting chemical composition of soil organic matter with mid-infrared spectra

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Prediction of Alkyl Carbon Relative Content in Example 1 Soil Organic Matter

[0070] (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.

[0071] (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

[0081] Prediction of relative content of alkoxycarbon in embodiment 2 soil organic matter

[0082] (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.

[0083] (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

[0091] Example 3 Prediction of Relative Aromatic Carbon Content in Soil Organic Matter

[0092] (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.

[0093] (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 the chemical composition of soil organic matter with mid-infrared spectra.The method includes the following steps that 1, the chemical composition of organic matter in a plurality of calibrated soil samples is measured; 2, diffuse reflection spectra of mid-infrared wavebands of the calibrated soil samples are collected, and original spectra are obtained; 3, the original spectra are subjected to smoothing preprocessing, and processed spectra are obtained; 4, a quantitative relationship model between spectral information and the chemical composition in the organic matter of processed spectra of the calibrated soil samples is established with a support vector machine; 5, diffuse reflection spectra of the mid-infrared wavebands of soil samples to be measured are collected, and the chemical composition of organic matter in the soil samples to be measured is calculated according to the quantitative relationship model.By means of the method, the chemical composition of soil organic matter can be predicated rapidly and accurately with a low cost.

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 by using mid-infrared spectrum. 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 ...

Claims

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Application Information

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IPC IPC(8): G01N21/3563G01N24/08G01N1/28G01N1/40
CPCG01N1/286G01N1/40G01N21/3563G01N24/081G01N2021/3572
Inventor 康宏樟喻文娟刘星宁沐蕾
Owner SHANGHAI JIAO TONG UNIV
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