Method for quick detection of stable carbon isotope ratio of soil by means of mid-infrared spectroscopy

A technology of stable carbon isotope and infrared spectroscopy, which is applied in the field of detecting the stable carbon isotope ratio of soil, and achieves the effects of wide application range, strong popularity and easy operation

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

AI Technical Summary

Problems solved by technology

[0008] At present, domestic and foreign analyzes of soil δ 13 C basically adopts the stable isotope ratio mass

Method used

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  • Method for quick detection of stable carbon isotope ratio of soil by means of mid-infrared spectroscopy
  • Method for quick detection of stable carbon isotope ratio of soil by means of mid-infrared spectroscopy
  • Method for quick detection of stable carbon isotope ratio of soil by means of mid-infrared spectroscopy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Example 1 Soil including Oe and Oa

[0065] (1) Prepare the soil sample to be tested. Remove impurities, air-dry, pulverize the soil in the mineral layer, pass through a 60-mesh sieve, and store in a desiccator for later use; dry the soil in the Oe and Oa layers at 60°C for 48 hours to remove water, pulverize, pass through a 60-mesh sieve, and store in a desiccator for later use. A total of 199 samples were obtained from cork oak forests at different depths (Oe, Oa, 0-2, 2-5, 5-10, 10-20cm) soil samples, including 139 soil samples in the mineral layer and 60 samples in the Oe and Oa layers.

[0066] From Table 1, the accuracy of the spectral model is only slightly improved after preprocessing with multivariate scattering correction, which proves that the sample is well prepared and the influence of particle scattering effect on the spectrum acquisition is minimized.

[0067] (2) Using stable isotope ratio mass spectrometry to measure the δ of the soil sample to be tes...

Embodiment 2

[0076] Example 2 Mineral layer soil not including Oe and Oa

[0077] (1) Prepare the soil sample to be tested. The soil of the mineral layer was removed, air-dried, pulverized, passed through a 60-mesh sieve, and stored in a desiccator for later use. A total of 139 samples were obtained from cork oak forests at different depths (0-2, 2-5, 5-10, 10-20cm) of mineral layer soil samples.

[0078] It can be seen from Table 1 that the accuracy of the spectral model is not improved after pretreatment with multivariate scattering correction, which proves that the sample is well prepared and the influence of particle scattering effect on the spectral acquisition is minimized.

[0079] (2) Using stable isotope ratio mass spectrometry to measure the δ of the soil sample to be tested 13 C value.

[0080] (3) Spectral collection. A 200 mg soil sample was weighed and placed in a 11 mm round stainless steel tank with a ZnSe window at the bottom, and the top of the sample was flattened. ...

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Abstract

The invention provides a method for quick detection of the stable carbon isotope ratio of soil by means of mid-infrared spectroscopy.The method comprises the steps of 1, measuring the stable carbon isotope ratios of multiple calibration soil samples; 2, acquiring the diffuse reflection spectrogram of middle-infrared bands of the calibration soil samples to obtain an original spectrogram; 3, conducting smooth pretreatment on the original spectrogram to obtain a treated spectrogram; 4, establishing a model about the quantitative relation between the treated spectrogram of the calibration soil samples and the stable carbon isotope ratios by means of a support vector machine; 5, acquiring the diffuse reflection spectrogram of the middle-infrared band of a soil sample to be measured, and calculating the stable carbon isotope ratio of the soil sample to be measured according to the quantitative relation model.By the adoption of the method, the delta 13 C value of soil can be measured quickly, accurately and easily at low cost.

Description

technical field [0001] The invention relates to the field of ecology, in particular to a method for detecting the stable carbon isotope ratio of soil. Background technique [0002] Stable carbon isotope ratio (δ 13 C) Analytical methods can be used to indicate the source of soil organic matter, study the degree of decomposition and turnover of soil organic matter and its components, and reproduce C 3 / C 4 The change history of vegetation is increasingly becoming a powerful tool in soil organic matter studies and ecology. Determination of soil δ 13 C generally uses stable isotope ratio mass spectrometry (IRMS), and its working principle is: the organic carbon in the soil is converted into gaseous CO through high-temperature combustion. 2 ; After being separated from other gases by the chromatographic column or adsorption column, it is ionized in the ion source; after the ion beam is focused and accelerated, it enters the mass analyzer; z) Deflection occurs, because the m...

Claims

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Application Information

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IPC IPC(8): G01N21/3563G01N1/28
CPCG01N1/286G01N21/3563G01N2021/3572
Inventor 康宏樟喻文娟刘星黄天颖
Owner SHANGHAI JIAO TONG UNIV
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