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Method for detecting soil stable carbon isotope ratio through intermediate infrared spectrum

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: 2016-06-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • 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 spectrometry method, and there is no use of mid-infrared spectroscopy to detect soil δ 13 C's report

Method used

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  • Method for detecting soil stable carbon isotope ratio through intermediate infrared spectrum
  • Method for detecting soil stable carbon isotope ratio through intermediate infrared spectrum
  • Method for detecting soil stable carbon isotope ratio through intermediate infrared spectrum

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 from the mineral layer soil, air-dry, pulverize, pass through a 60-mesh sieve, and store in a desiccator for later use; bake the Oe and Oa layer soil at 60°C for 48 hours to remove moisture, pulverize, pass through a 60-mesh sieve, and store in a desiccator for future use. A total of 199 samples came from different depths (Oe, Oa, 0-2, 2-5, 5-10, 10-20cm) soil samples, including 139 mineral layer soils and 60 Oe and Oa layer soils.

[0066]From Table 1, the accuracy of the spectral model has not been improved after multivariate scattering correction preprocessing, which proves that the sample is well prepared, and the influence of particle scattering effect on spectral acquisition is minimized as much as possible.

[0067] (2) Using stable isotope ratio mass spectrometry to measure the δ of the soil sample to be tested 13 C value.

[0068] (3) Spectrum collection....

Embodiment 2

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

[0077] (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 139 samples came from different depths (0-2, 2-5, 5-10, 0-2, 2-5, 5-10, 10-20cm) of mineral layer soil samples.

[0078] From Table 2, the accuracy of the spectral model is only slightly improved after multivariate scattering correction preprocessing, which proves that the sample is prepared well, and the influence of particle scattering effect on spectral acquisition is minimized as much as possible.

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

[0080] (3) Spectrum collection. Weigh 200 mg of soil sample and place it in a 11 mm circular stainless steel sample tank with a ZnSe window at the bottom and flatten the top of the sample. The diffu...

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Abstract

The invention provides a method for detecting a soil stable carbon isotope ratio through an intermediate infrared spectrum. The method comprises the steps that 1, the stable carbon isotope ratio of multiple calibrated soil samples is measured; 2, a diffuse reflection spectrogram of intermediate infrared wavebands of the calibrated soil samples is collected, and an original spectrogram is obtained; 3, the original spectrogram is subjected to smoothing preprocessing, and a processed spectrogram is obtained; 4, a partial least square method is adopted for establishing a quantitative relation model between the processed spectrogram of the calibrated soil samples and the stable carbon isotope ratio; 5, a diffuse reflection spectrogram of intermediate infrared wavebands of the soil samples to be detected is collected, and the stable carbon isotope ratio of the soil samples to be detected is calculated according to the quantitative relation model. By means of the method, a soil delta 13 C value can be measured quickly, accurately, easily and conveniently 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): G01N21/3563
CPCG01N21/3563
Inventor 康宏樟喻文娟刘星高唤唤
Owner SHANGHAI JIAO TONG UNIV
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