A water quality multi-indicator detection method based on ultraviolet-visible absorption spectroscopy

Abstract

The invention relates to a water quality multi-index detection method based on ultraviolet-visible absorption spectrum, which comprises the following steps: 1) establishing a water quality algorithm model including each water quality index; 2) measuring and obtaining the ultraviolet-visible absorption spectrum of the water body to be tested; 3) According to the water quality algorithm model of the water body to be measured and the ultraviolet-visible absorption spectrum of the water body to be measured, calculate the preliminary calculation value of each water quality index in the water body to be measured; 4) perform the preliminary calculation value of each water quality index in the water body to be measured Local calibration to obtain the test results corresponding to each water quality index; 5) compare the obtained test results corresponding to each water quality index with the relevant water quality standards of each water quality index, and judge whether the water quality to be tested exceeds the standard and give an early warning. The invention measures the ultraviolet-visible full-wavelength absorption spectrum of the water body, and combines the water quality algorithm model and correction parameters to simultaneously calculate various water quality indicators in the water. Therefore, the present invention can be widely used in the monitoring and early warning mainly applicable to the process control of various surface water, various sewage, drinking water, sewage and water supply treatment process.

Description

technical field [0001] The invention relates to a water quality standard detection method, in particular to a water quality multi-index detection method based on ultraviolet-visible absorption spectrum. Background technique [0002] Water quality analysis is to measure and evaluate the quality status and change law of water resources, and provide scientific basis for the development, utilization, management and protection of water resources by the country and governments at all levels. The quality of water resources is usually described by water quality indicators, commonly used water quality indicators include COD (Chemical Oxygen Demand, chemical oxygen demand), TOC (Total Organic Carbon, total organic carbon), DOC (Dissolved Organic Carbon, dissolved organic carbon) , BOD (Biochemical Oxygen Demand, biochemical oxygen demand), nitrate nitrogen, nitrite nitrogen, turbidity / suspended solids, chromaticity (color and true color), UV254 (or called SAC254, that is, the waveleng...

AI Technical Summary

Problems solved by technology

However, due to the lack of analytical methods for UV-Vis absorption spectra, this method has not been widely used.

Although there are researches and applications on absorbance measurement based on ultraviolet-visible absorption spectrum, the absorbance of one to two absorption wavelengths is used to analyze and test a water quality index, and it cannot comprehensively reflect the situation of multiple water quality indexes. Therefore, the accuracy of the measurement results is low and the stability is poor, so it cannot be widely used.

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