A chemical oxygen demand detction device

Abstract

The invention discloses a chemical oxygen demand detection device, which comprises a three-electrode module, a fixing base, an electrochemical control and measuring module and an analyzing module. The working electrodes of the three-electrode module can include a titanium dioxide nanotube array electrode which is 1800-2300nm long; an ultraviolet light emitting diode with a single wavelength provides exciting light and the electrochemical control and measuring module provides a voltage to complete the photoelectrocatalysis reaction of the working electrodes. The fixing base is used for fixing the three-electrode module and the ultraviolet light emitting diode to be immersed in samples. The electrochemical control and measuring module can be electrically connected with the three-electrode module to receive a current signal corresponding to a unit time. The analyzing module can be connected with the electrochemical control and measuring module and used for performing integration on the current signal according to time to obtain a total electric charge quantity and calculate a chemical oxygen demand measuring result according to the total electric charge quantity.

Description

technical field [0001] The invention relates to a detection device for chemical oxygen demand, in particular to a detection device for detecting chemical oxygen demand by utilizing the photocatalytic reaction of titanium dioxide nanotube arrays. Background technique [0002] The testing standards commonly used to detect water pollution are chemical oxygen demand (COD) and biochemical oxygen demand (BOD). Generally speaking, the biochemical oxygen demand can be calculated from the value of chemical oxygen demand. They are used to detect the dissolved oxygen consumed by oxidants or microorganisms to decompose substances in water to indicate the degree of organic pollution in water. Traditionally, methods for detecting chemical oxygen demand include reflux method, titration method, potassium permanganate method, etc. In the operation of the above methods, excessive potassium dichromate or potassium permanganate will be added to the sample for oxidation reaction, and then revers...

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Problems solved by technology

[0003] (1) The reaction and operation time is long, about 3 to 4 hours

[0004] (2) Mercury sulfate needs to be added during the detection process, which will produce mercury-containing waste liquid and cause secondary pollution to the environment

[0005] (3) There will be many interferences during the detection, such as: sample pH value, chloride ion, cyanide ion, hexavalent chromium ion, hydrogen peroxide, heavy metals and other toxic chemicals, and other reagents need to be added to exclude them during detection

[0021] However, the existing detection device uses a xenon lamp as the ultraviolet light source. In order to prevent the sample solution from being heated by infrared rays, an infrared filter and an optical shutter are required for use. Then open the shutter to complete the experimental operation, which is inconvenient in a large number of detection processes, and causes the structure of the detection device to be complicated

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