Method for analyzing type of arsenic compound in water by utilizing infrared absorption spectrum generated by surface-enhanced infrared absorption effect

Abstract

The invention relates to a method for analyzing the type of an arsenic compound in water by utilizing an infrared absorption spectrum generated by a surface-enhanced infrared absorption effect, which is wide in application range, fast and convenient in analysis and beneficial to environmental protection. The technical scheme is that the method comprises the following steps: (1) conveying a water sample solution to be detected through a pump; (2) mixing the water sample solution with acetic acid, acetic acid in sodium acetate buffer solution pipeline and a chelating agent-potassium tartrate in a chelating agent solution pipeline; (3) mixing the mixed solution with a chelate sample selectively formed by the arsenic compound-a methyl arsenic compound in a water sample and an ethylenediamine tetraacetic acid solution in an ethylenediamine tetraacetic acid pipeline; (4) causing the mixed solution to enter an infrared absorption cell; (5) causing near infrared wave band light lambda 1-lambda 2 to synchronously pass through the infrared absorption cell; (6) synchronously collecting the spectroscopic data of lambda 1-lambda 2 through a CCD photoelectric detector positioned at the detection window of the infrared absorption cell to obtain wavelength-light intensity two-dimensional spectrum; and (7) calculating and analyzing the type and the concentration of the arsenic compound in water.

Description

Technical field [0001] The present invention is an analysis method in the type of arsenic compounds in water bodies. Specifically, it is a method of wide application scope, fast analysis, and environmental protection. [0002] This method uses the infrared absorption spectrum produced by the surface to enhance the infrared absorption effect and the optical characteristics of the "infrared characteristic spectrum" of various arsenic compounds in the water body — that is, the molecular vibration frequency of various arsenic compounds has different frequency with different infrared absorption wavelengths for comparison, Analyze the types of various arsenide compounds in water bodies, and calculate the concentration of various arsenide compounds based on spectral strength. Background technique [0003] Arsenic elements are a wide range of elements that are widely distributed in nature.In recent years, due to coal mining and other industrial pollution, the concentration of arsenic in ...

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Problems solved by technology

However, the cost and maintenance costs of this system are very expensive, and it is difficult to promote it in routine analysis.

In addition, the method adopts the mode of on-site sampling and analysis in the laboratory, that is, the method of on-site and real-time measurement cannot be realized, and other interfering substances are easily introduced during the sample transportation and processing process, which affects the accuracy of the analysis.

Therefore, it is impossible to guarantee that there will be no possibility of secondary pollution for the analysis of trace elements in this process, and for complex and changeable water environment, for example: element forms are greatly affected by time and space; most of them are interrelated and interact The state of the environment; the temperature and pressure changes greatly in the environment, the accuracy and reliability of the results are questioned, so it is impossible to accurately grasp the current status of water quality and its abnormal changes

[0005] In addition, the analysis process is complicated, the conditions are harsh, the consumption of reagents is large, and secondary pollution is generated. For the complex and changeable water body environment, that is, the structure and concentration of organic matter are greatly affected by time and space, and most of them are in a state of mutual correlation and mutual influence; water body environment The temperature and pressure changes greatly; for factors such as high concentration ions in seawater, such as chloride ions, whose content is relatively stable, the accuracy and credibility of the results will be questioned

[0006] The above methods have the following defects in varying degrees: 1. It must be completed in the laboratory, and the application cannot be real-time on site, and the scope is limited

2. The analysis takes a long time, at least a few days

3. The analysis process is complicated, the conditions are harsh, the energy consumption is high, and the technical level of the experimenters is high.

4. Chemical reagents must be used, resulting in secondary pollution, which is not conducive to environmental protection

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