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Electrochemical sensor and application thereof in rapid detection for hydrogen sulphide

A sensor and electrochemical technology, which is applied in the field of H2S electrochemical sensors, can solve the problems of high electrode cost and impact on electrode life, and achieve the effect of requiring less sample volume, low detection cost, and extremely high detection cost

Inactive Publication Date: 2015-07-01
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these modification methods require long-term pretreatment of the electrode, and the electrode is expensive. For some corrosive samples, it may have a great impact on the life of the electrode.

Method used

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  • Electrochemical sensor and application thereof in rapid detection for hydrogen sulphide
  • Electrochemical sensor and application thereof in rapid detection for hydrogen sulphide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Electrode pretreatment: soak the screen-printed electrodes with 0.1 M nitric acid and 0.1 M sulfuric acid for 2 minutes respectively, then wash them with double distilled water and dry them for later use;

[0022] (2) Preparation of buffer: prepare 0.2 M K 2 HPO 4 solution and 0.2 M KH 2 PO 4 solution, mix the two solutions to adjust the pH to 5.6, and store for later use.

[0023] (3) Preparation of electronic mediator: weigh K 3 [Fe(CN) 6 ], K 4 [Fe(CN) 6 ] and KCl were formulated to contain 5 mM K 3 [Fe(CN) 6 ], 5 mM K 4 [Fe(CN) 6 ] and 0.1 M KCl solution, stored for later use;

[0024] (4) Preparation of detection bottom solution: respectively take 10 mL of the buffer obtained in step (2) and 0.1 mL of the electronic mediator obtained in step (3) into the detection cell, and mix them evenly; use DPV for electrochemical detection of H 2 S, the standard curve of DPV response current and concentration is made as figure 2 , the detection range is 6 ~ 3...

Embodiment 2

[0027] (1) Electrode pretreatment: soak the screen-printed electrodes with 0.1 M nitric acid and 0.1 M sulfuric acid for 2 minutes respectively, then wash them with double distilled water and dry them for later use;

[0028] (2) Preparation of buffer: prepare 0.2 M K 2 HPO 4solution and 0.2 M KH 2 PO 4 solution, mix the two solutions and adjust the pH to 5.6, and store for later use.

[0029] (3) Preparation of electronic mediator: weigh K 3 [Fe(CN) 6 ], K 4 [Fe(CN) 6 ] and KCl were formulated to contain 5 mM K 3 [Fe(CN) 6 ], 5 mM K 4 [Fe(CN) 6 ] and 0.1 M KCl solution, stored for later use;

[0030] (4) Preparation of detection bottom solution: respectively take 10 mL of the buffer obtained in step (2) and 0.1 mL of the electronic mediator obtained in step (3) into the detection pool, and mix them evenly;

[0031] (5) Treatment and detection of samples: extract H-containing fruit from the dryer for fumigation 2 10 mL of S gas was slowly injected into the pre-prep...

Embodiment 3

[0033] (1) Electrode pretreatment: soak the screen-printed electrodes with 0.1 M nitric acid and 0.1 M sulfuric acid for 2 minutes respectively, then wash them with double distilled water and dry them for later use;

[0034] (2) Preparation of buffer: prepare 0.2 M K 2 HPO 4 solution and 0.2 M KH 2 PO 4 solution, mix the two solutions and adjust the pH to 5.6, and store for later use.

[0035] (3) Preparation of electronic mediator: weigh K 3 [Fe(CN) 6 ], K 4 [Fe(CN) 6 ] and KCl were formulated to contain 5 mM K 3 [Fe(CN) 6 ], 5 mM K 4 [Fe(CN) 6 ] and 0.1 M KCl solution, stored for later use;

[0036] (4) Preparation of detection bottom solution: respectively take 10 mL of the buffer obtained in step (2) and 0.1 mL of the electronic mediator obtained in step (3) into the detection pool, and mix them evenly;

[0037] (5) Sample treatment and detection: 0.1 mL of wastewater sample (coal-measure groundwater of Huaibei Coal Mine) was taken and added to the pre-prepared...

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Abstract

The invention aims at providing an electrochemical sensor manufactured by adopting a silk-screen printing electrode, and a method for rapidly detecting H2S by using the electrochemical sensor. According to the method provided by the invention, a qualitative and quantitative detection is carried out on H2S in a nitrogen atmosphere environment mainly by virtue of a redox reaction between S<2-> and Fe<3+>; the electrochemical detection is carried out on H2S by virtue of the silk-screen printing electrode, and modification treatment does not need to be previously carried out on the electrode, thus solving the problems of complex operation, high cost, high sample size, high time consumption and the like of a common detection method; instant detection for H2S is realized, and the method has the advantages of being convenient and fast, high in detection sensitivity (the detection limit is as low as 2muM), low in needed sample quantity, extremely low in detection cost, less in interference, and the like.

Description

technical field [0001] The present invention relates to an electrochemical sensor, in particular to a fast detection of H in plant cells, air and liquid solutions 2 Electrochemical sensors for S. Background technique [0002] Hydrogen sulfide is a toxic gas with the smell of rotten eggs. It is an acute neurotoxin. Low concentrations of hydrogen sulfide can affect the eyes, respiratory system, and nerve center. Inhalation of high concentrations of hydrogen sulfide can cause permanent brain damage. injury or even death. However, many studies have also shown that H 2 S will also have a greater impact on the urinary, digestive, blood and other systems. People are often exposed to H in their daily life 2 S, such as: closed environments of factories, sewers and oil fields often contain high concentrations of H 2 S, a serious threat to human life; research results in recent years have shown that hydrogen sulfide has a good effect on fruit preservation, so it is also useful H ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/28G01N27/48
Inventor 叶永康徐后传葛晓光操小栋丁顺高娇娜
Owner HEFEI UNIV OF TECH