Water quality multi-parameter detection method based on ultraviolet-visible absorption spectrum technology

Abstract

The invention discloses a water quality multi-parameter detection method based on an ultraviolet-visible absorption spectrum technology, which comprises the following steps: preparation before detection, water sample pretreatment, spectral feature extraction, measurement of the absorbance spectrum of a water sample by using an ultraviolet-visible spectrograph to obtain original spectral data; the method comprises the following steps: using a spectral feature extraction algorithm to obtain an average change rate S, adjusting the weight of spectral data, establishing a partial least square model, using a weighted spectral data set as input, combining the model and using a comprehensive prediction algorithm to obtain a comprehensive prediction value and a result report of water quality parameters. The method has the advantages that the influence of redundant features is reduced, the target water quality parameters are detected, the detection precision is improved, the calculation burden is reduced, the detection efficiency is improved, the comprehensive prediction value can utilize the strong terms of each model, the problems of over-fitting and under-fitting possibly occurring in a single model are reduced, and the prediction accuracy of the whole model is improved.

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