UV scanning type multispectral water-quality COD rapid detection method and device therefor

A detection device and scanning technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of inability to fully reflect the degree of water pollution, non-compliance of linear correlation, and limitations of data communication networks, so as to improve applicability and measurement accuracy performance, improve measurement speed, and reduce measurement error

Inactive Publication Date: 2007-05-23
ZHEJIANG UNIV
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Problems solved by technology

The linear correlation relationship established with a single absorbance value and COD does not conform to and cannot fully reflect the pollution degree of the water body. The use of ultraviolet single-band COD measurement method is subject to the applicability and accuracy of different water bodies, and the networking of data communication. very restrictive

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  • UV scanning type multispectral water-quality COD rapid detection method and device therefor
  • UV scanning type multispectral water-quality COD rapid detection method and device therefor
  • UV scanning type multispectral water-quality COD rapid detection method and device therefor

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Embodiment Construction

[0023] An ultraviolet scanning multi-spectral water quality COD rapid detection method of the present invention: firstly scan the water sample in the entire ultraviolet range from 200 nm to 400 nm; secondly, calculate the absorption spectrum data of the entire ultraviolet range based on the blank calibration result and the scanning result, The third is to obtain multiple characteristic spectra reflecting the characteristics of the organic pollution of the water body from all the absorbance data. The fourth is to use these characteristic spectra and the corresponding COD values ​​to establish a correlation model between the two using BP neural network. In the actual water sample measurement, the measured characteristic spectrum and the established correlation model are used to quickly retrieve the COD value of the water sample.

[0024] As shown in Figure 1: The UV-scanning multi-spectral water quality COD rapid detection device of the present invention is composed of a flow measur...

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Abstract

The invention discloses an ultraviolet scanning multi-spectral water quality COD rapid detection method and its device. Embedded computer system connects to the single-chip system, and the single-chip system connects in turn to spectrum scanning stepper motor, measuring valve, cleaning valve, and the flow measurement groove respectively connects with automatic cleaning device, water sample export, cleaning valve, measuring valve, and cleaning valve connecting with washing water import, measuring valve connecting with water sample import, and ultraviolet light of deuterium lamp is gathered by measuring groove, and the ultraviolet light after water absorption is gathered to project to the plane grating spectrophotometry system, and after spectrophotometry, project to the photoelectric conversion circuit, the photoelectric conversion circuit connecting the single-chip system. The invention increases the applicability and the measurement accuracy of UV absorption based COD measuring instrument; it implements the fully automation of water extraction, measuring groove cleansing and measurement, and increases the on-line measurement speed, and cat fit in the online, fast and accurate analysis and test of the environmental water and various waste water COD.

Description

Technical field [0001] The invention relates to an ultraviolet scanning type multispectral water quality COD rapid detection method and device. Background technique [0002] Chemical Oxygen Demand (COD) is a representative indicator of organic pollution in water quality. In water environmental protection and governance, this parameter is used as a mandatory item to characterize the degree of water pollution at home and abroad. At present, the measurement methods of COD parameters at home and abroad mainly include: potassium dichromate method (CODcr method) for wastewater, potassium permanganate method (CODMn) for surface water, and ultraviolet absorbance method (UV method) can simultaneously measure wastewater and Surface water. Because the UV method has the advantages of no secondary pollution and fast measurement speed, the current on-site measurement has shown a trend to replace the CODcr method. UV method has relatively mature products abroad, and has been widely used in Euro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N21/27
Inventor 王晓萍詹舒越林桢
Owner ZHEJIANG UNIV
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