A low temperature compensation method for cod detection

Abstract

A low-temperature compensation method for COD detection, which relates to the field of environmental monitoring technology. In order to solve the problem that the existing detection technology cannot perform temperature compensation for COD at low temperatures, the method includes: step 1, using a binary cubic polynomial to represent the absorbance value z(x , y) and the temperature value x, COD concentration value y function relationship; step two, collect the absorbance corresponding to COD under different temperatures and different concentrations; step three, determine the objective function of z (x, y); step four, use the minimum Find the optimal solution of the function z(x, y) by the square method Step 5, establish a COD low temperature compensation model; this method uses the least square method to establish a COD low temperature compensation model among temperature, concentration, and absorbance, and solves the problem that cannot The problem of temperature compensation for COD at low temperature (0°C‑20°C). The built model has strong intuitiveness, high detection accuracy and good practicability, and can be widely used in COD detection in low-temperature environments in natural waters.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a low temperature compensation method for COD detection. Background technique [0002] Chemical oxygen demand, or COD, is a chemical method to measure the amount of reducing substances that need to be oxidized in a water sample, indicating the degree of pollution of the water body by reducing substances. [0003] Among the COD detection methods, the spectral detection method is an effective method for COD detection. When detecting the COD temperature of water quality in the field, the detection value of COD solution at different temperatures varies greatly. In the existing literature, only the influence of temperature on the detection of COD is discussed. For example, the journal is "Spectroscopy and Spectral Analysis", the author is Bi Weihong, etc., and the title is "Study on the Effect of Temperature on the Detection of Nitrate in COD by Ultraviolet Spectrosc...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing detection technology cannot perform temperature compensation for COD at low temperature, the present invention provides a low temperature compensation method for COD detection, which can compensate the COD value detected by low temperature water samples (0°C-20°C) in real time as COD value at standard temperature (20°C), good compensation effect

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