Water sample high-precision COD detection device and method

Abstract

The invention provides a water sample high-precision COD detection device and method which are used for improving the detection precision of a micro COD detection device; an absorbance detection and correction method in the method specifically comprises the steps: firstly, preparing calibration solutions with various concentrations, and then measuring in a temperature range required by COD detection to obtain a calibration data set of the COD absorbance of the calibration solutions along with the temperature change; and carding to obtain curves of COD absorbance of the high-concentration calibration solution and COD absorbance of the low-concentration calibration solution changing along with temperature, fitting the two curves to obtain a temperature compensation curve formula of a high-concentration COD water sample and a low-concentration COD water sample, and correcting measured original absorbance data by using the temperature compensation curve formula when the water samples are detected by the micro COD detection device. According to the invention, a temperature compensation scheme based on software is adopted to correct COD detection data of the water samples, so that the detection device can be miniaturized on the premise of ensuring the detection precision; and meanwhile, a miniaturized cleaning device is also arranged at the detection light path of the product, so that the influence of light path smudginess on the detection precision can be reduced.

Description

technical field [0001] The invention relates to the technical field of water sample detection, in particular to a water sample high-precision COD detection device and method. Background technique [0002] Ultraviolet light is often used for optical detection in the detection of water samples, but the temperature will affect the absorbance of the solution to ultraviolet light, thereby affecting the measured value. Because the temperature will affect the chemical reaction of the solution and the movement of molecules. Some chemical reactions do not react at room temperature, but they may react when the temperature is very high; and the temperature will affect the energy of the electrons in the outer shell of the atom, thereby changing its The absorption spectrum shifts the absorption spectrum and requires temperature compensation. [0003] At the same time, the COD detection device commonly used in the market currently uses optocoupler detection and positioning as a solution ...

AI Technical Summary

Problems solved by technology

[0002] Ultraviolet light is often used for optical detection in water sample detection, but the temperature will affect the absorbance of the solution to ultraviolet light, thereby affecting the measured value

Because the temperature will affect the chemical reaction of the solution and the movement of molecules. Some chemical reactions do not react at room temperature, but they may react when the temperature is very high; and the temperature will affect the energy of the electrons in the outer shell of the atom, thereby changing its The absorption spectrum shifts the absorption spectrum and requires temperature compensation

[0003] At the same time, the COD detection device commonly used in the market currently uses optocoupler detection and positioning as a solution to the positioning of cleaning brushes. However, this method is costly, and the structure requires the installation of optocoupler positions. The error rate is high and the requirements for process assembly are high. It is not easy to design the structure of miniaturized products, and often there is not enough space to place optocouplers

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