Dissolved oxygen micro electrode and preparing method thereof
A dissolved oxygen microelectrode and reference electrode technology, applied in the direction of material electrochemical variables, can solve the problems of long response time, low sensitivity, cumbersome operation, etc., and achieve the effects of short response time, wide application prospects and high sensitivity
Active Publication Date: 2009-04-15
陕西省膜分离技术研究院有限公司
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Problems solved by technology
[0005] The currently used dissolved oxygen electrodes are bulky, have long response time, are generally not high in sensitivity, and are cumbersome to operate, and most of them are still on a macro basis
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[0026] see figure 2 with image 3 , a kind of dissolved oxygen microelectrode prepared according to the technical scheme of the present invention comprises an outer casing 10 filled with an electrolyte 12 after the membrane, the outer casing 10 is made of soda-lime glass, and its one end is pointed, and its tip is smaller than 50 μm. The tip is injected with a silicone rubber film 18; the center of the outer casing 10 is equipped with an induction cathode made of a platinum wire 16, and the platinum wire 16 has a section of platinum wire exposed at the tip of the outer casing 10. Outside the capillary glass tube 14, the exposed platinum wire is corroded and plated with gold; the outer casing 10 is also equipped with an Ag / AgCl internal reference electrode and a silver protective cathode, wherein the sensing cathode is connected to the Ag / AgCl internal reference electrode, and the silver The protective electrode is inserted separately, the tip of the silver protective electr...
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Abstract
The invention discloses a dissolved oxygen microelectrode and a preparation method thereof. The prepared dissolved oxygen microelectrode comprises an external bushing which is filled with postretinal electrolyte, one end of the external bushing takes the shape of a tip which is injected with silastic film; an induction cathode, an Ag / AgCl internal reference electrode and a sliver protection cathode which are made of platinum filament are arranged in the central part of the external bushing, and the distance between the tip of the sliver protection electrode and the tip of the platinum filament is 50Mum-200Mum; epoxide resin is adopted to enseal the external busing and a capillary glass tube; and down-leads of the platinum filament induction cathode, the Ag / AgCl internal reference electrode and the sliver protection cathode are respectively welded on post heads which are corresponding to polarized plugs. The invention has the advantages of small volume, high resolving capability, short response time, high sensitivity, wide application range, simple preparation method and low cost, can rapidly detect the dissolved oxygen of activated sludge floc or infinitesimal environment in a biomembrane; in addition, the invention has wide application prospect on the microstudy in the fields of environmental microbiology, biological sewage treatment, etc.
Description
technical field [0001] The invention relates to a microelectrode and its preparation, in particular to a dissolved oxygen microelectrode and its preparation method. Background technique [0002] The water environment is closely related to human life, and the quality of water seriously affects human health. The content of D0 (dissolved oxygen) in the water body environment is one of the important indicators of the pollution degree of the water body and the quality of the ecological environment. It is closely related to other indicators in the water such as BOD and COD. It is an indispensable monitoring project for water quality monitoring department. In environmental monitoring, the most classic method for determining D0 in water is iodometric method, but the whole off-line determination process of iodometric method from sampling fixation to titration is easily interfered by many factors. Especially for the determination of extremely hypoxic or anaerobic water samples, the ...
Claims
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Inventor 王磊王旭东杨永哲张立卿李志霞王韬孟千秋崔星许维白晓荣佐藤久福士宪一
Owner 陕西省膜分离技术研究院有限公司