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Micro near-infrared spectral analytical method based on enrichment of integrated material

A technology of near-infrared spectroscopy and monolithic materials, which is applied in the direction of scattering characteristic measurement and test sample preparation, can solve the problems of unsuitability for low-content components, determination of metal elements, and low sensitivity of near-infrared spectroscopy technology analysis, and achieve adsorption The effect of improving the analytical sensitivity and improving the purification and enrichment effect without changing the enrichment effect

Inactive Publication Date: 2010-03-03
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

However, the analytical sensitivity of near-infrared spectroscopy is not high, and it is not suitable for the detection of low content components, so it is considered as a constant analysis technique
In addition, since inorganic elements have no obvious absorption to near-infrared spectra, metal elements cannot be directly determined by near-infrared spectroscopy. The metal elements in the samples measured by the method have been combined with the sample matrix in complex derivative forms such as complexation and chelation during the long-term growth of crops. The determination of metal elements is actually by measuring Together the organic matrix achieves

Method used

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  • Micro near-infrared spectral analytical method based on enrichment of integrated material

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Embodiment 1

[0024] Integral materials include two types of organic and inorganic substrates. The representative materials are polymethacrylate and silica gel integral materials. The following polymethacrylate integral materials are used to prepare enrichment devices for near-infrared spectroscopy of trace metal copper ions The analysis is taken as an example, and the present invention will be further described in conjunction with the accompanying drawings.

[0025] (1) Synthesis of polymethacrylate monolithic materials

[0026] ① Weigh (monomer) glycidyl methacrylate GMA 1.2960g, (crosslinking agent) ethylene glycol dimethacrylate EDMA 0.8640g, (initiator) benzoyl peroxide BPO 0.0216g, (porogen ) 0.5184g of dodecanol and 2.7216g of cyclohexanol are poured into a straight tube mold; the mold is a glass tube, metal tube or plastic tube with an inner diameter of 3mm to 50mm, and the length is 50mm to 200mm; ②Blow nitrogen until the BPO is completely dissolved, Put the stopper on immediately...

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Abstract

The invention relates to a micro near-infrared spectral analytical method based on enrichment of an integrated material, which comprises the following steps: the in-situ polymerization is carried outon the integrated material for enrichment in an enrichment device or a fixed mould; the material is modified according to needs; the thickness of the in-situ polymerization material is 5-10 mm; as forthe material previously synthesized in the mould, the integrated material is cut into round slices with the thickness of 5-10 mm; the integrated material round slice is fixed on one end of the deviceby adhesive or a physical cutting ferrule and aligned with the edge; and after the enrichment, the near-infrared spectrum of the material surface with concentrated analytical components is measured in a scattered reflection mode. The method enhances the effects of purification and enrichment, realizes the near-infrared spectral direction measurement of the material surface after the enrichment, enhances the analytical sensitivity, achieves the goal of the near-infrared spectral analysis on the micro substances and realizes the indirect measurement of metallic elements by using a near-infraredspectrum. The material can be repetitively used with basically unchanged effects of absorption and enrichment.

Description

【Technical field】 [0001] The invention mainly relates to the field of sample pretreatment of analytical chemistry, specifically, a micro-near-infrared spectral analysis method based on overall material enrichment. 【Background technique】 [0002] Near-infrared spectral analysis technology is the fastest-growing spectral analysis technology in recent years. Its outstanding advantages are no need for sample preparation, easy operation, non-destructive analysis, and no consumption of reagents. These have made this technology widely used in more and more fields. application, and has a good application prospect. However, the analytical sensitivity of near-infrared spectroscopy is not high, and it is not suitable for the detection of low content components, so it is considered as a constant analysis technique. In addition, since inorganic elements have no obvious absorption on near-infrared spectra, metal elements cannot be directly determined by near-infrared spectroscopy. The m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/49G01N1/28
Inventor 杜一平张维冰陈贵平方娟娟
Owner EAST CHINA UNIV OF SCI & TECH
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