Method for detecting COD (chemical oxygen demand) and turbidity of water quality through spectroscopy method

Abstract

The invention discloses a method for detecting COD (chemical oxygen demand) and turbidity of water quality through a spectroscopy method. The method comprises the following steps: (1) a plurality of spectral feature curves affected only by the turbidity are obtained, preprocessed and then fit, and thus a turbidity correlation model F1 is obtained; (2) a plurality of spectral feature curves affected only by the turbidity and the COD are obtained, preprocessed and then divided into spectral band data sets when turbidity values are different, each set is fit, thus COD correlation models when theturbidity values are different are obtained, then each COD correlation model and the corresponding turbidity are fit, and thus an associated turbidity and COD correlation model F2 is obtained; and (3)according to the spectral feature curve of a to-be-detected water sample, the turbidity value is calculated through the turbidity correlation model F1, and a COD value is calculated through the correlation model F2 based on the turbidity. According to the method, the COD and the turbidity ingredient in the monitored water sample can be analyzed quickly and effectively.

Description

technical field [0001] The invention relates to water quality detection, in particular to a spectral water quality COD and turbidity detection method. Background technique [0002] The problem of drinking water safety is directly related to the health of the general public. It is necessary to actively explore and adopt advanced and feasible monitoring technologies and methods, to grasp the changes in water quality of important drinking water sources in real time, and to strengthen water quality early warning and emergency response capabilities for sudden water pollution incidents. Urgent. [0003] The 2012-2014 National Water Resources Monitoring Capacity Building Project (hereinafter referred to as the first phase project) was completed in 2015. After the completion of the first phase of the project, it has played an important role in filling the lack of water resources monitoring means in my country, improving the weak water resources management infrastructure, and improv...

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Problems solved by technology

[0004] In recent years, my country's water quality related indicators still use chemical methods. Although the measurement is relatively accurate, it takes a long time, requires many chemical reagents, complex operations, poor stability, and serious secondary pollution. Fast speed, it is an essential means for online monitoring

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