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A kind of determination method of water cod value based on ultraviolet absorption spectrum

A determination method and external absorption technology are applied in the field of water COD value determination based on ultraviolet absorption spectrum to achieve the effect of improving accuracy

Active Publication Date: 2020-04-07
YANSHAN UNIV
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  • Application Information

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Problems solved by technology

It can be seen that the UV absorption spectrometry of the prior art is only applicable to water bodies when the COD value is small

Method used

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  • A kind of determination method of water cod value based on ultraviolet absorption spectrum
  • A kind of determination method of water cod value based on ultraviolet absorption spectrum
  • A kind of determination method of water cod value based on ultraviolet absorption spectrum

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Embodiment 1

[0102] (1) The prepared COD value is 40mg / L, 80mg / L, 160mg / L, 180mg / L, 190mg / L, 200mg / L, 210mg / L, 220mg / L, 240mg / L, 260mg / L, 280mg / L , 300mg / L, 320mg / L, 340mg / L, 360mg / L, 380mg / L, 400mg / L, 440mg / L, 480mg / L, 520mg / L, 560mg / L, 600mg / L, 640mg / L of 23 Group samples, and use a 10mm quartz glass cuvette with an ultraviolet transmittance of more than 85% to measure the absorbance of each sample at 275nm; CUV-ALL-UV4-WAY cuvette transmission bracket and portable computer;

[0103] (2) Use the COD value and absorbance data obtained in step (1) as a calibration set, and arrange them in ascending order;

[0104] (3) Based on the data points of the COD value in the calibration set ranging from 40 mg / L to 190 mg / L, the one-variable robust linear least squares regression method is used to obtain the COD value-absorbance linear equation, that is, 190 mg / L is used as the hypothetical low concentration critical point Point, using the COD value-absorbance linear equation to predict the COD va...

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Abstract

The invention belongs to the technical field of water COD (chemical oxygen demand) value determination and provides a water COD value determination method based on an ultraviolet absorption spectrum.The method comprises the steps of repeatedly fitting a linear or exponential equation to predict a next data point by a point-to-point predicting mode, accurately finding out a preset low-concentration critical point and a high-concentration critical point, obtaining a low-concentration section model and a high-concentration section model, combining the low-concentration section model and the high-concentration section model to form a linear-exponential section model and the low-concentration critical point, calculating a COD value of a sample to be detected through the low-concentration section model when absorbance of the sample to be detected is less than the low-concentration critical point, and calculating the COD value of the sample to be detected through the high-concentration section model when the absorbance of the sample to be detected is greater than the low-concentration critical point. The accuracy of the determination method is greatly improved as compared with the Lambert-Beer law in the prior art.

Description

technical field [0001] The invention relates to the technical field of water body COD value measurement, in particular to a water body COD value measurement method based on ultraviolet absorption spectrum. Background technique [0002] At present, the national standard method to measure water quality is still dominated by conventional chemical methods, which are widely used, but the process of this kind of measurement method is relatively complicated, and because it is an offline measurement, the measurement time is long, and the measurement results cannot reflect the changes in water quality in time. Ultraviolet absorption spectroscopic analysis is a purely physical optical determination method for qualitative and quantitative analysis of pollutant categories and comprehensive indicators based on spectral data. Compared with conventional chemical methods, ultraviolet absorption spectrometry has simple equipment structure, less maintenance, and no The advantages of secondary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 田广军徐光耀田青
Owner YANSHAN UNIV
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