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Photochemical chemical oxygen demand (COD) sensor and method of measuring same

A sensor and photochemical technology, applied in the field of sensors, can solve problems such as failure to achieve real-time measurement, and achieve the effects of fast measurement speed, good real-time performance and extended life.

Inactive Publication Date: 2010-03-17
肖剑
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Problems solved by technology

[0007] Up to now, whether it is the traditional potassium dichromate and potassium permanganate method or the latest photochemical catalytic oxidation method, reagents, complex and precise flow injection system and complex water sample pretreatment system are required, and the real real-time measurement

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  • Photochemical chemical oxygen demand (COD) sensor and method of measuring same
  • Photochemical chemical oxygen demand (COD) sensor and method of measuring same

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Embodiment Construction

[0025] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0026] see figure 1 , figure 2A photochemical COD sensor, including electrode body 1, electrode cover 2, central processing circuit board 3, silver / silver chloride reference electrode 4, nano-titanium dioxide working electrode 5, filter hole cleaning brush 6, electrode glass substrate polytetrafluoroethylene Ethylene filter element 7, supporting electrolyte chamber 8, ultraviolet light-emitting diode 9, counter electrode 10, counter electrode electrolyte chamber 11, battery diaphragm polytetrafluoroethylene filter element 12, O-ring 13. The electrode casing and the electrode body are both processed by turning polytetrafluoroethylene rods.

[0027] The reference electrode was a silver / silver chloride electrode. Production method: Plating a si...

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Abstract

The invention provides a photochemical chemical oxygen demand (COD) electrode and a method of measuring the same. The working electrode is a nanometer titanium dioxide photocatalysis and photooxidation electrode and is arranged in a supported electrolyte solution cavity. After organic matters in the water sample under test enter the supported electrolyte solution cavity and reach the surface of the working electrode by a polytetrafluoroethylene filter element through diffusion, the working electrode generates photo-generated electrons and holes under the ultraviolet irradiation; the holes arecaptured by the organic matters and then catalyzed and oxidized by the organic matters; the photo-generated electrons are forced to flow to a counter electrode and a platinum electrode under the action of an external electric field; and the platinum electrode is captured by oxidant in an electrolyte solution cavity of the counter electrode to form the light current. The amperage of the light current depends on the speed the organic matters enter the supported electrolyte solution cavity through diffusion and is proportional to the concentration of the oxidizable organic matters in the water sample under test, i.e., the COD in the water sample under test. The outer surface of the polytetrafluoroethylene filter element is provided with an automatic cleaning brush which can clean the surfaceof the polytetrafluoroethylene filter element at regular time to prevent the polytetrafluoroethylene filter element from being blocked. The invention is very practical and is suitable for both outdoorconvenient measuring and long-time real-time monitoring.

Description

technical field [0001] The invention relates to a sensor, in particular to a sensor for detecting chemical oxygen demand in water by catalyzing and oxidizing organic matter in water with tin dioxide / titanium dioxide multilayer composite nano-film and a measuring method thereof. Background technique [0002] Chemical oxygen demand (COD) is one of the most important and widely used parameters to characterize the quality of water body. The world spends more than 10 billion on COD measurement every year. The COD measurement methods publicly recognized and widely used in the world mainly include potassium dichromate method and potassium permanganate method. Among them, the potassium dichromate method is mainly used for sewage with high chemical oxygen demand, while the potassium permanganate method is mainly used for surface water and natural water bodies with low chemical oxygen demand. Both methods require complex testing processes and complex supporting systems, including he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/413G01N27/30
Inventor 肖剑姚辉张清敏申雄兵丁萍
Owner 肖剑
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