Visual in-situ analysis method of nitrocompound in soil
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A technology of nitro compounds and analysis methods, applied in the field of analysis of the interface behavior of nitro compounds in polluted soil, can solve difficult and direct problems
Inactive Publication Date: 2014-12-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology
It is difficult to directly and simultaneously analyze the binding sites and distribution of nitro compounds, different forms of organic carbon and clay minerals in soil by conventional techniques
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Embodiment 1
[0028] Follow the steps below:
[0029] 1) Soil sample preparation:
[0030] 1,3-Dinitrobenzene (DNB) pollutes the brown soil with a pollution concentration of 1200 mg / kg; after mixing evenly, add sterile water to the field water holding capacity, and prepare for sectioning after overnight.
[0031] Select suitable size and stable microaggregates, use Microm HM525 cryostat, directly slice the microaggregates with a thickness of 0.1-10μm, and transfer them to Low-glass slides for spectroscopic analysis.
[0032] 2) FTIR microscopic imaging analysis:
[0033] Using the Taiwan Light Source (NSRRC) 14A1 beamline to directly analyze DNB polluted brown soil microsection samples, the analysis step is 5-30μm, and the resolution is 1-4cm -1 , scanned 32-128 times; the imaging data was analyzed by Omnic 8.0 to obtain the nitro group (1536cm -1 ), organic carbon aromatic group (1613cm -1 ), carboxyl (1730cm -1 ), fat base (2922cm -1 ) functional groups and clay minerals (the main c...
Embodiment 2
[0037] 1) Soil sample preparation:
[0038] 1,3-Dinitrobenzene-contaminated black soil: the pollution concentration is 1200mg / kg; after mixing evenly, add sterile water to the field water holding capacity, and prepare for slicing after overnight. The soil microsection preparation method is the same as Example 1.
[0039] 2) FTIR microscopic imaging analysis:
[0040] The main analytical instruments and parameters are the same as in Example 1. The imaging data was analyzed by Omnic 8.0 to obtain the nitro group (1543cm -1 ), organic carbon aromatic group (1613cm -1 ), carboxyl (1730cm -1), fat base (2922cm -1 ) functional groups and clay minerals (the main clay mineral in black soil is illite, and its O-H position is 3621cm -1 ) on the micro-area distribution map on the micro-section (such as Figure 4 shown).
[0041] 3) Through correlation analysis and Image-Pro Plus, it can be obtained that the micro-region distribution of 1,3-dinitrobenzene in black soil is also mai...
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Abstract
The invention relates to a visual in-situ analysis method of nitrocompound in soil. The method comprises the following steps: (1) slicing frozen soil microaggregate particle to obtain a micro-slice sample, and transferring the micro-slice sample onto a glass slide; (2) analyzing nitrocompound, different organic carbon morphologies and clay minerals constituents and microcell distribution in a to-be-detected micro-slice sample by utilizing a synchronous radiation Fourier transform infrared microscope imaging technology; and (3) performing spectrum unfolding on the measured data to obtain the occurrence form and microcell distribution spectrogram of the nitrocompound, different morphological organic carbon and clay minerals in the soil; analyzing the spectrogram to obtain a critical factor influencing the combination site and microcell distribution of the nitrocompound in the soil. The method has an intuitive effect, the visual observation of the nitrocompound in the soil is realized, and experiment evidence and theoretical support are supported for disclosing relevant reaction mechanism and repairing the polluted soil.
Description
technical field [0001] The invention belongs to the field of analytical chemistry of organic pollutants, and in particular relates to an analysis method for the interface behavior of nitro compounds in polluted soil, including a preparation method and analysis parameters of a sample to be analyzed. Background technique [0002] The interfacial migration and transformation behavior of organic pollutants in soil is closely related to their binding sites and storage forms on soil media. Research in this area has always been a hot spot in the field of environmental chemistry. Previous related research mainly relied on chemical extraction, mass spectrometry and other means. These methods inevitably cause disturbance and damage to soil composition and structure, and it is difficult to reflect the true distribution of pollutants in soil. Spectroscopy techniques based on synchrotron radiation sources have the characteristics of good spatial resolution and high sensitivity. With t...
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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3563
Inventor 罗磊吕继涛温蓓张淑贞
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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