Method for characterizing organic pollution characteristics of water body by using ultraviolet spectrum

Abstract

The invention discloses a method for characterizing organic pollution characteristics of a water body by using ultraviolet spectrum peak data. The method is characterized by comprising the following steps: establishing a database according to absorption characteristics of different types of organic matters in a 200-400nm ultraviolet region; in actual monitoring, firstly, enabling a water sample to be subjected to ultraviolet absorption spectrum determination, then carrying out characteristic extraction on an ultraviolet spectrogram after peak division, comparing the characteristics with absorption wavelengths in a database one by one, and expressing a comparison result in a vector form; for each group of water samples, obtaining a group of vectors representing pollutants, and calculating an included angle of the two groups of vectors to judge whether the pollutant compositions are similar or not; and for two groups of water samples with similar pollutant compositions, further judging whether the pollutant concentration is greatly changed or not by comparing vector lengths. The method is high in universality, and monitoring of specific types of pollutants can be achieved by adjusting the types of the pollutants in the database.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and more specifically relates to a method for characterizing characteristics of water body organic pollution by using ultraviolet spectroscopy. Background technique [0002] Traditional water quality testing equipment takes manual on-site sampling and then sends it to the laboratory for analysis and measurement; this method has the characteristics of long measurement period, high sampling cost, and requires professional operation. In recent years, the method of water quality analysis based on ultraviolet absorption spectroscopy has been widely used. The advantages of ultraviolet spectroscopy include: rich ultraviolet spectral information, the most accurate acquisition, no need to add additional chemical reagents, and avoid the hazard of secondary pollution; water sample treatment It is convenient, simple, non-destructive, and has fast detection and analysis speed. With the help o...

AI Technical Summary

Problems solved by technology

[0006] The present invention uses ultraviolet spectrum data to characterize the characteristics of water quality organic pollution, and then judges whether the water quality has changed. The technical problems to be solved include: 1. The absorbance of a certain wavelength in the ultraviolet absorption spectrum is the superimposed value of multiple substances, and the direct application of ultraviolet When judging the spectral peak, it is difficult to correspond to specific pollutants; 2. How to express the ultraviolet spectral data as the characteristics of water samples, and this characterization method is relatively general and can be applied to various water bodies; 3. How to establish a A method that is simple to calculate and does not require a large amount of data training to discriminate changes in water quality characteristics

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