Correction method for turbidity influence during water quality COD detection by using ultraviolet-visible spectroscopy

A spectroscopic and turbidity technology, which is applied in the direction of color/spectral characteristic measurement, measuring device, material analysis through optical means, etc., can solve the problems of interference accuracy and lifting, and achieve the goal of deducting the influence of turbidity and realizing rapid determination Effect

Pending Publication Date: 2021-02-05
CHONGQING UNIV OF TECH
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Problems solved by technology

[0004] The detection of water quality COD by UV-visible spectroscopy also has the above advantages, but in turbid water, turbidity will cause a nonlinear rise in the overall UV-visible spectrum, thereby

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  • Correction method for turbidity influence during water quality COD detection by using ultraviolet-visible spectroscopy
  • Correction method for turbidity influence during water quality COD detection by using ultraviolet-visible spectroscopy
  • Correction method for turbidity influence during water quality COD detection by using ultraviolet-visible spectroscopy

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Embodiment 2

[0067] Through the correction method of turbidity influence when detecting water quality COD by ultraviolet-visible spectroscopy, the establishment of multiple comparison data is carried out, and the actual test is carried out. For the actual water sample of a certain lake, the COD value measured by the Hach DRB200 and DR2800 instruments is 32mg / L. The instrument is a permanganate method, determined by chemical method, compared with lake water and deionized water, which meets the national standard. The turbidity measured by Hach HACN2100Q is 6NTU. Using this method and system, the turbidity correction is obtained. For the UV-Vis absorption spectrum, see Image 6 .

[0068] At the same time, it can be seen from the above experimental analysis that the overall effect of turbidity on the UV-visible spectrum of water samples is a nonlinear rise, and it is difficult to use a single wavelength for correction.

[0069] In summary, the algorithm proposed by the present invention can ...

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Abstract

The invention relates to a correction method for turbidity influence during water quality COD detection by using ultraviolet-visible spectroscopy. The correction method comprises the following steps of: firstly, acquiring absorption spectrum data of a to-be-detected water sample and a plurality of turbidity standard solutions, and solving a turbidity influence matrix, wherein the concentrations ofthe turbidity standard solutions correspond to the concentration of the water sample to be detected; calculating an observation matrix and a sparse basis matrix through utilizing a compressed sensingtheory to obtain a turbidity influence factor; solving an optimal solution through using a norm to reconstruct a turbidity absorption spectrum influence matrix; and finally, deducting the turbidity absorption spectrum influence from the absorption spectrum data of the to-be-detected water sample to obtain the COD absorption spectrum. According to the correction method, under the condition that the ultraviolet absorption properties of the ultraviolet-visible spectroscopy is not influenced, turbidity correction of the ultraviolet-visible absorption spectrum of an actual water sample can be effectively realized, turbidity influence is deducted, the COD absorption spectrum of a detection result and the correlation coefficient of the actual water sample reach 0.9941, the root-mean-square erroris 0.0098, and an effective new method is provided for accurately realizing accurate calculation of the COD of the water quality.

Description

technical field [0001] The invention belongs to the technical field of using optical means to test or analyze materials in physical testing, and in particular relates to a method for correcting the influence of turbidity when detecting water quality COD by ultraviolet-visible spectroscopy. Background technique [0002] At present, the detection of water quality mainly adopts chemical method and spectroscopic analysis method. Although the traditional chemical method has high detection accuracy, the detection cycle is long and requires professional operation. The chemical reagents used are also prone to secondary pollution. [0003] Ultraviolet-visible spectroscopy is a method of analyzing and measuring by using the molecules of certain substances to absorb radiation in the 200-800nm ​​spectral region. It uses a spectrometer to connect to a computer for data processing and recording to complete and form an absorption spectrum. By establishing sample spectral information and it...

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Application Information

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IPC IPC(8): G01N21/27G01N21/31G01N21/33
CPCG01N21/274G01N21/31G01N21/33
Inventor 汤斌李奉笑陈庆汪仁杰赵明富缪俊锋黄子恒张愉
Owner CHONGQING UNIV OF TECH
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