HCN (hydrogen cyanide) electrochemical sensor

A sensor and electrochemical technology, applied in the field of HCN four-electrode electrochemical sensor, to achieve accurate measurement and eliminate cross-interference

Active Publication Date: 2013-10-02
RAE SYST SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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However, this method also has certain limitations. At a certain potenti

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Examples

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Embodiment 1

[0066] In this embodiment, the first working electrode of the HCN electrochemical sensor is a graphite electrode, and the second working electrode is an Au / C / graphite electrode, wherein the mass percentage of Au, C, and graphite is 4:3:3, and the counter electrode is Pt electrode, the reference electrode is a Pt electrode. Electrolyte is H 2 SO 4 Aqueous solution, the concentration is 6M. The electrochemically active materials of the counter electrode and the reference electrode are fixed on the PTFE waterproof and gas-permeable membrane.

[0067] The preparation process of the Au / C / graphite diffusion electrode in this example is basically the same as the preparation method of the Au / C electrode described in U.S. Patent 4,042,464, the difference is that a certain amount of graphite, graphite It is a good conductive material. On the one hand, it can increase the conductivity of the electrode, and on the other hand, it can reduce the cost. In addition, from a certain point of...

Embodiment 2

[0070] In this embodiment, the first working electrode of the HCN electrochemical sensor is a C electrode, the second working electrode is an Au / C electrode, wherein the mass percentage of Au and C is 3:2, the counter electrode is a Pt electrode, and the reference electrode for the Pt electrode. Electrolyte is H 2 SO 4 Aqueous solution, the concentration is 6M. The electrochemically active materials of the counter electrode and the reference electrode are fixed on the PTFE waterproof and gas-permeable membrane.

[0071] In this embodiment, the preparation process of the Au / C electrode is the same as that described in US Patent 4,042,464.

[0072] In the presence of NO and NO 2 To test the HCN gas in the case of interference, first the mixed gas of the three gases reaches the first working electrode (C electrode), and the first working electrode is at a potential of 1.35V relative to the standard hydrogen electrode. At this time, NO 2 Under the catalytic action of C catal...

Embodiment 3

[0077] In this embodiment, the first working electrode of the HCN electrochemical sensor is a graphite electrode, and the second working electrode is an Au / C / graphite electrode, wherein the mass percentages of Au, C, and graphite are 3.5:3:3.5, and the counter electrode is Pt electrode, the reference electrode is a Pt electrode. Electrolyte is H 2 SO 4 Aqueous solution, the concentration is 6M. The electrochemically active materials of the counter electrode and the reference electrode are fixed on the PTFE waterproof and gas-permeable membrane.

[0078] The preparation process of the Au / C / graphite diffusion electrode in this example is basically the same as the preparation method of the Au / C electrode described in U.S. Patent 4,042,464, the difference is that a certain amount of graphite, graphite It is a good conductive material. On the one hand, it can increase the conductivity of the electrode, and on the other hand, it can reduce the cost. In addition, from a certain po...

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Abstract

The invention relates to the field of electrochemical sensors, and in particular relates to an HCN (hydrogen cyanide) four-electrode electrochemical sensor resistant to nitrogen monoxide and nitrogen dioxide interference. The HCN electrochemical sensor provided by the invention comprises a first working electrode, a second working electrode, a reference electrode and a counter electrode which form ion conduction via electrolyte, wherein the first working electrode is a carbon element electrode, and the second working electrode an Au-containing electrode. The HCN electrochemical sensor provided by the invention is capable of effectively eliminating the cross interference between NO and NO2 and accurately measuring the concentration of an HCN gas via the design of a four-electrode sensor system comprising the reference electrode, the counter electrode and the two working electrodes.

Description

technical field [0001] The invention relates to the field of electrochemical sensors, in particular to an HCN four-electrode electrochemical sensor capable of resisting the interference of nitric oxide and nitrogen dioxide. Background technique [0002] HCN gas is a colorless, highly toxic gas with an odor of bitter almonds. HCN gas needs to be strictly monitored in factories that manufacture nylon, dyes, fumigants, rubber, and plastics, as well as factories that preserve food, gold plating, and heavy metal extraction, and fire sites. [0003] Due to the high toxicity of HCN, all countries have regulated its safety value. For example, the American Occupational Safety and Health Association (OSHA) has recently given the following HCN safety values: 15-minute short-term exposure limit (STEL-15min) is 4.7ppm, and the immediate lethal dose (IDLH) is 50ppm. [0004] In addition, in the environment where the HCN sensor is used, such as at a fire scene, there are often nitrogen o...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 魏娜于玉忠刘玲胡平周华方
Owner RAE SYST SHANGHAI
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