Spectral water quality detection method

Abstract

The invention provides a spectrum water quality detection method. The spectrum water quality detection method comprises the following steps: acquiring an absorption spectrum of a water body to be detected in an ultraviolet-visible light full wave band; inverting the turbidity of the to-be-detected water body by utilizing a visible light wave band, and performing turbidity correction on the turbidity of the to-be-detected water body based on a singular value decomposition method to obtain an absorption spectrum after turbidity correction; and converting the absorption spectrum after turbidity correction into various water quality parameters by using an inversion model pre-trained by a partial least squares regression method. According to the method, turbidity correction is carried out on the absorption spectrum through the singular value decomposition method, the number of wave bands participating in turbidity correction is reduced, the turbidity correction precision is improved, and the inversion precision of other water quality parameters is further improved. And a laboratory standard sample and environmental water sample spectrum database is constructed during regression modeling, so that training samples can be supplemented during subsequent use, the inversion range of the model is expanded, and the environmental adaptability and the inversion precision of the model are improved.

Description

technical field [0001] The invention relates to the technical field of water quality detection, in particular to a spectral water quality detection method. Background technique [0002] In the process of water environment treatment and protection, detecting the concentration of various water quality parameters can reflect the quality of the water environment and the degree of pollution. National standards such as "Surface Water Environmental Quality Standard" (GB3838-2002), "Integrated Wastewater Discharge Standard" (GB8978-1996) and other national standards clearly stipulate the concentration limits of various water quality parameters. Quick detection is very important. [0003] The traditional water quality detection method is a chemical method. Although this method has high precision, it requires a lot of cost and is prone to secondary pollution during the detection process. In view of the problems existing in the commonly used water quality testing methods, water quali...

AI Technical Summary

Problems solved by technology

However, this method is difficult to completely deduct the influence of turbidity on the spectrum, especially in the ultraviolet band, so it also affects the inversion accuracy of various subsequent water quality parameters. Therefore, the inversion of water quality parameters is carried out by using the original absorption spectrum for turbidity compensation. There is still a large discrepancy

In addition, the widely used spectral water quality detection methods currently use several characteristic bands in the ultraviolet-visible band to invert the water quality parameters, which not only loses a lot of spectral information, but also changes the concentration. offset, resulting in a drop in inversion accuracy

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