Water quality multi-parameter ultraviolet-visible absorption spectrum quantitative inversion method

Abstract

The invention relates to a water quality multi-parameter ultraviolet-visible absorption spectrum quantitative inversion method, which comprises the steps of 1, selecting an original absorption spectrum 0A320-750 of a water sample of a waveband of 320-750nm, and carrying out analysis by using a partial least squares (PLS) method to obtain water turbidity; 2, calculating a turbidity extinction spectrum 1B200-320 of the waveband of 200-320nm by utilizing the original absorption spectrum 0A320-750 of the water sample of the waveband of 320-750nm and a Mie scattering correction method; subtractingthe turbidity extinction spectrum from the original absorption spectrum of the waveband to obtain an absorption spectrum 1A200-320 after turbidity compensation; 3, selecting an absorption spectrum 1A260-320 subjected to turbidity compensation at the waveband of 260-320nm, and analyzing by utilizing the partial least squares (PLS) method to obtain a COD concentration analysis result; 4, normalizinga COD absorption spectrum and the COD analysis result by utilizing the concentration, calculating a COD compensation spectrum 2B200-260 of the waveband of 200-260nm, and subtracting the COD compensation spectrum 2B200-260 from the absorption spectrum 1A200-260 after turbidity compensation of the waveband to obtain the turbidity and an absorption spectrum 2A200-260 after COD compensation; and 5, selecting 200-260nm turbidity and the absorption spectrum 2A200-260 after COD compensation, and analyzing by using the partial least squares (PLS) method to obtain the nitrate concentration.

Description

technical field [0001] The invention belongs to the fields of resources, environment and ocean, and in particular relates to a water quality multi-parameter ultraviolet-visible absorption spectrum quantitative inversion method. Background technique [0002] With the rapid development of my country's economy, industrial and agricultural wastewater and domestic sewage are increasing, which seriously exceed the purification ability of nature itself, and have a great impact on the aquatic ecosystem and human living environment. UV-Vis absorption spectrum contains a large amount of pollutant information, which can fully reflect the water quality status. It has the characteristics of no need for sample pretreatment and real-time online monitoring. It is a fast and efficient water quality multi-parameter detection method, which has been widely used in water quality monitoring in recent years. In the 1960s, Ogura et al. first pointed out that there is a certain correlation between t...

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Problems solved by technology

[0003] Aiming at the problem that it is difficult to quantify water quality parameters by ultraviolet-visible absorption spectroscopy due to the overlap and intersection between particle extinction spectra, organic matter and nitrate absorption spectra, the present invention proposes a water quality multi-parameter Quantitative inversion method of ultraviolet-visible absorption spectrum, through layered analysis of ultraviolet-visible absorption spectrum, solves the problem of overlapping of turbidity extinction spectrum, COD absorption spectrum and nitrate absorption spectrum, and realizes quantitative inversion of turbidity, COD and nitrate concentration , providing fast and effective means for rapid monitoring and evaluation of multi-parameters of water quality and emergency monitoring of sudden pollution accidents

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