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Nitrite ionic selectivity micro-electrode and preparing method thereof

A nitrite ion and selective technology, which is applied to the electrochemical variables of materials, material analysis through electromagnetic means, and measurement devices, can solve the problems of lack of testing methods for nitrite ions and the retention of nitrite ions, etc., to achieve The effect of fine tip, small size and optimized processing technology

Inactive Publication Date: 2009-05-20
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

For a long time, due to the lack of suitable tools, the determination of nitrite ions has remained on a macro basis, and the research on the changes of nitrite ions in the microscopic area lacks corresponding testing methods

Method used

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  • Nitrite ionic selectivity micro-electrode and preparing method thereof
  • Nitrite ionic selectivity micro-electrode and preparing method thereof

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Embodiment Construction

[0016] see figure 1 , the nitrite ion selective microelectrode of the present invention comprises a tapered outer casing 1, the cavity of the tapered glass casing 1 is filled with membrane back electrolyte 2, the tip of the tapered glass casing 1 Injected with nitrite ion selective liquid membrane 5, Ag / AgCl wire 3 is installed in tapered glass casing 1, Ag / AgCl wire 3 is fixed and sealed with epoxy resin 4 at the mouth of tapered glass casing 1 Tapered glass sleeve1.

[0017] The tapered glass sleeve 1 is a single-layer tube and is made into a pointed shape with a tip length of 1-10 μm.

[0018] Electrolyte behind membrane 210mmol / L NaNO 2 , 300mmol / L KCl, 10mmol / L Na 3 PO 4 12H 2 O composition, the pH was adjusted to 7.

[0019] The nitrite ion selective microelectrode has a tip of 1-10 μm and a linear response range of 10 -1 ~10 -5 M, the slope is 55.4mV / -log[NO 2 - ], the detection limit is 1×10 -5 M. The electrode response time is short, generally less than 5s...

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Abstract

The invention discloses a nitrite ion selective microelectrode and a preparation method thereof. The nitrite ion selective microelectrode comprises a conical glass bushing, an after-membrane electrolyte is filled in a cavity of the conical glass bushing, a tip part of the conical glass bushing is injected with a nitrite ion selective liquid membrane, an Ag / AgCl wire is arranged in the conical glass bushing, and an epoxy resin is used to fix the Ag / AgCl wire and seal the conical glass bushing at a mouth part of the conical glass bushing. The diameter of the tip of the nitrite ion selective microelectrode is between 1 and 10mu m, the linear response range is between 10<-1> and 10<-5>M, the slope is 55.4mV / -log[NO2<->], and the lower detection limit is between 1*10<-5>M. The response time of the microelectrode is short and is generally less than 5s, and the nitrite ion selective microelectrode has the advantages of small volume, simple production and low cost.

Description

technical field [0001] The invention relates to a microelectrode and its preparation, in particular to a nitrite ion selective microelectrode and its preparation method. technical background [0002] Severe environmental pollution has made sewage treatment more and more important. Nitrogen removal is an important part of sewage treatment. Its mechanism discussion and process optimization are inseparable from the determination of nitrite ions. For a long time, due to the lack of suitable tools, the determination of nitrite ions has remained on a macro basis, and the research on the changes of nitrite ions in the microscopic area lacks corresponding testing methods. Contents of the invention [0003] In view of the defects or deficiencies in the above-mentioned prior art, the object of the present invention is to provide a nitrite ion selective microelectrode and a manufacturing method thereof. The nitrite ion selective microelectrode made by the present invention is suitabl...

Claims

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Application Information

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IPC IPC(8): G01N27/333G01N27/36
Inventor 王旭东王磊杨永哲张立卿孟千秋王韬李志霞崔星许维白晓荣佐藤久福士宪一
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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