A dom-based water quality evaluation method and device

Abstract

The invention discloses a water quality evaluation method and device based on DOM. The computer controls the laser to emit ultraviolet laser light and incident on the water sample to be tested, and the water sample to be tested generates a scattered light signal and a fluorescent signal, and the scattered light signal and the fluorescent signal are first filtered. The light is filtered by the grating spectroscopic system, and then focused on the surface of the photodetector through the optical lens and converted into electrical signals and transmitted to the computer for data processing to obtain the spectral curve, and obtain the Raman peak intensity and fluorescence peak intensity in the spectral curve and background noise spectral intensity, calculate the D of the water sample to be tested according to the water quality evaluation formula m value. The DOM content in the water sample to be tested can be quickly evaluated through the spectral curve, and the water quality can be measured in real time, which is helpful to understand and improve the water quality in time, and has guiding significance for the selection of water quality; and the device uses a miniature semiconductor laser and a spectroscopic system, and the circuit board Highly integrated, greatly reducing the device volume of the fluorescence spectrometer, making the device portable and easy to use.

Description

technical field [0001] The invention relates to the field of water quality detection, in particular to a DOM-based water quality evaluation method and device. Background technique [0002] Dissolved organic matter (Dissolved Organic Matter, DOM) is a highly heterogeneous mixture that plays an important role in the ecosystem process. It is a humic substance, and humic acid will have a major impact on the health of the ecology through light attenuation, nutrient availability, and pollutant migration. Therefore, DOM can be used to reflect the degree of water pollution as an important indicator in water quality testing. [0003] The traditional method of detecting the concentration of DOM is very time-consuming and the procedures are very complicated. It cannot monitor the changing water quality in time. With the development of spectral technology, a large number of fluorescence techniques are used in water quality detection. Its principle is to use certain substances It is in ...

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used fluorescence method for detecting DOM concentration is three-dimensional fluorescence spectroscopy. Although the three-dimensional fluorescence spectroscopy method has high precision, it requires a continuously variable wavelength excitation light source, which takes a long time to measure, and the equipment is large in size, complex in structure, and cumbersome in operation.

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