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Characterization of nano Iron oxide in the soil

wallpapers News 2021-11-03
The characterization of nano iron oxide in soil mainly includes composition analysis, morphology analysis, particle size analysis, structure analysis, and surface interface analysis. According to the different analysis purposes, the composition analysis of nano-ferric oxide in soil mainly includes the whole element composition analysis and the micro-area composition analysis. The spectral methods include flame and electrothermal atomic absorption spectroscopy (AAS), inductively coupled plasma atomic emission spectroscopy (ICP-OES), and X-ray diffraction spectroscopy (XRD). Energy spectrum analysis mainly includes electron microscope energy spectrum analysis method EDAX, X-ray photoelectron spectroscopy (XPS), and Auger electron spectroscopy (AES). These two methods are suitable for surface and micro-area composition analysis. The size and shape of nano-ferric oxide particles in soil have a significant relationship with their mobility, stability, and reactivity in the soil-water system. Therefore, it is of great significance to characterize the size and shape of nano-ferric oxide particles in the soil. At present, the sedimentation method is used to characterize particle size. There is also electron microscopy particle size analysis, mainly scanning electron microscopy and transmission electron microscopy.
The particle resolution of ordinary scanning electron microscopy is about 6nm, and that of field emission scanning electron microscopy is up to 0.5nm. For transmission electron microscopy, the range of particle size analysis is between 1 and 300nm due to the need for an electron beam through the sample. In addition, there are laser diffraction granulometric, which can accurately analyze iron oxide above 5μ m, dynamic light scattering granulometry, which can accurately determine samples below 5μm. The exciting light scattering method can measure the particle size distribution between 20m and 3500μ m. Moreover, photon coherence spectroscopy can measure the particle size distribution in the range of 1nm-3000nm, which is suitable for the particle size analysis of ultrafine nanoparticles.
The phase structure and crystal structure of nanoparticles also play an important role in the properties of nanoparticles. At present, the commonly used phase analysis methods include X-ray diffraction analysis (XRD), laser Raman analysis, and micro electron diffraction analysis. Analysis in mineral facies. Generally, XRD is used. XRD phase analysis is based on the X-ray diffraction effect of polycrystalline samples to analyze the presence of each component in the sample. The sensitivity of this method is low. Firstly, it can only determine the phase with the content of 1% or more in the sample. At the same time, the accuracy of quantitative determination is not high, generally in the order of 1%, and can not analyze the amorphous sample. The crystallization can also be determined by X-ray electron diffraction.

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