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Chemical oxygen demand and nitrate nitrogen water quality monitoring probe and method

A technology for chemical oxygen demand and water quality monitoring, applied in measuring devices, scientific instruments, color/spectral characteristic measurement, etc., can solve problems such as high nitrate nitrogen concentration, achieve good monochromaticity, accurate and effective online real-time monitoring, structure simple effect

Inactive Publication Date: 2021-01-29
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the dissolved organic matter in the water sample also has a strong absorption at 229nm, the measured nitrate nitrogen concentration will be seriously high

Method used

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  • Chemical oxygen demand and nitrate nitrogen water quality monitoring probe and method
  • Chemical oxygen demand and nitrate nitrogen water quality monitoring probe and method
  • Chemical oxygen demand and nitrate nitrogen water quality monitoring probe and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 , shows the dissolved organic matter and nitrate nitrogen water quality monitoring probe, including a casing 1, a circuit board 2, and an optical detection component 3.

[0043] The housing 1 adopts a four-section structure, including a front-end housing 1-1, an optical detection protection housing 1-2, a main circuit protection housing 1-3 and a cable fixing housing 1-4, and the optical detection component 3 is located in the optical detection protection housing. Inside the casing 1-2, the circuit board 2 is located inside the main circuit protection casing 1-3, wherein the front end casing 1-1, the optical detection protection casing 1-2 and the main circuit protection casing 1-3 pass through each other Rubber gaskets and threads are used to fix the waterproof connection. M3 holes are opened at the end of the main circuit protection casing 1-3, and the rubber gasket is used to waterproof and fix the connection cable to fix the casing 1-4.

[0044] Su...

Embodiment 2

[0060] This embodiment is basically the same as Embodiment 1, the difference is:

[0061] Such as figure 2 As shown, the second deep ultraviolet LED 3-2 with a peak wavelength of 275±5nm is packaged in a TO39 metal package, and the corresponding photodiode B and the feedback resistor used in the operational amplifier circuit on the circuit board is 1MΩ. Since there is no metal packaging form for 235±5nm deep ultraviolet LEDs on the market, 3535nm SMD packaging is still used.

Embodiment 3

[0063] This embodiment is basically the same as Embodiment 1, the difference is:

[0064] The photodiode used for ultraviolet detection and the photodiode used on the circuit board are SiC-based photodiodes. Compared with AlGaN-based photodiodes, the response wavelength is mainly below 300nm.

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Abstract

The invention belongs to the field of spectrum method water quality analysis and detection, and discloses a chemical oxygen demand and nitrate nitrogen water quality monitoring probe and method. The probe comprises a shell, a circuit mainboard and an optical detection assembly, and the circuit mainboard and the optical detection assembly are arranged in the shell; the optical detection assembly comprises a first ultraviolet LED with the peak wavelength of 235 + / -5 nm, a second deep ultraviolet LED with the peak wavelength of 275 + / -5 nm, an ultraviolet detection photodiode A and an ultravioletdetection photodiode B, and the centers of the light sources of the first deep ultraviolet LED and the second deep ultraviolet LED are respectively opposite to the centers of the ultraviolet detection photodiode A and the ultraviolet detection photodiode B in pairs through quartz plates. According to the monitoring device, in the nitrate nitrogen monitoring process, interference of dual wavelengths on organic matter is utilized for calibration, and accurate and effective online real-time monitoring of two water quality indexes of chemical oxygen demand and nitrate nitrogen can be achieved atthe same time.

Description

technical field [0001] The invention relates to the technical field of spectroscopic water quality analysis and detection, in particular to a chemical oxygen demand and nitrate nitrogen water quality monitoring probe and method. Background technique [0002] Dissolved organic matter (DOM) is ubiquitous in various natural water bodies and sewage, and DOM is the main contributor to the Chemical Oxygen Demand (COD). Nitrogen is an important nutrient element that causes eutrophication in water bodies, and nitrate nitrogen is an important monitoring indicator for water environment and sewage discharge. [0003] At present, the methods for testing COD mainly include chemical methods and spectroscopic methods. Among them, the chemical method mainly uses potassium dichromate or potassium permanganate reagents to oxidize organic matter and other reducing substances in water; while the spectroscopic method mainly uses the characteristic absorption of dissolved organic matter in the r...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N21/31G01N21/25G01N21/27
CPCG01N21/33G01N21/3151G01N21/255G01N21/276G01N2021/3133G01N2021/3181G01N2201/022G01N2201/062G01N2201/12715
Inventor 李文涛季闻翔李爱民陆海周东韩玉泽申珊齐谢显传周庆双陈冬施鹏潘旸路瑶孟倩
Owner NANJING UNIV
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