DD271179A1 - Device for the electrochemical determination of ammonia in gases - Google Patents

Device for the electrochemical determination of ammonia in gases Download PDF

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Publication number
DD271179A1
DD271179A1 DD31334188A DD31334188A DD271179A1 DD 271179 A1 DD271179 A1 DD 271179A1 DD 31334188 A DD31334188 A DD 31334188A DD 31334188 A DD31334188 A DD 31334188A DD 271179 A1 DD271179 A1 DD 271179A1
Authority
DD
German Democratic Republic
Prior art keywords
electrode
ammonia
device
invention
membrane
Prior art date
Application number
DD31334188A
Other languages
German (de)
Inventor
Hans Berge
Roland Lammert
Original Assignee
Univ Rostock
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Univ Rostock filed Critical Univ Rostock
Priority to DD31334188A priority Critical patent/DD271179A1/en
Publication of DD271179A1 publication Critical patent/DD271179A1/en

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Abstract

The invention relates to a device for the electrochemical determination of ammonia in gases, consisting of a voltammetric cell which is separated from the gas medium by an ammonia permeable membrane. The device operates cyclic-voltammetric or chronoamperometric with a stationary mercury electrode. The device can be used as a detector for alarm devices and also for trace determination of ammonia.

Description

embodiment

The invention will be explained in more detail with reference to a Ausführungsbeispils. The attached drawing shows the structure in section. According to Figure 1, the device consists of a test tube-like polyethylene tube, at the lower end of a round opening is kept free. Before this opening, a gas-permeable membrane A made of PTFE is stretched. The cell is filled with 0.1 M Na 2 CO 3 / NaHCO 3 buffer E.

In the center of the opening, a stationary mercury electrode B is brought close to the membrane. If necessary, an auxiliary electrode of platinumaze can be introduced from B without contact between A and B. The counter electrode used is a platinum or gold tube D, by which a current key for the reference electrode C (GKE or Ag / AgCl) is brought into the vicinity of B. The polyethylene tube is closed by a PVC Straubverschluß containing all electrical connection options including the reference electrode at the top. By this arrangement, the apparatus can be used to measure gaseous ammonia in gases or liquids. The device is operated with a conventional voltammetric measuring device in three-electrode technology. Typical potential ranges are from + 40OmV to -40OmV. It can be cyclic voltammetric with a polarization speed of 1 V / min or chronoamperometrisch work. The effect of ammonia is expressed in a reduction of the Oxidatinsstromes, which is concentration-proportional.

Claims (3)

1. A device for the electrochemical determination of ammonia, characterized in that a stationary mercury B electrode behind an ammonia-permeable membrane A is arranged such that the stationary mercury B periodically oxidized or reduced in cyclic-voltametric or chronoamperometric mode in three-electrode technology and thereby an ammonia concentration-dependent Signal change is effected, with a not closer? Auxiliary electrode arrangement between membrane A and the working electrode B can be used to suppress disturbances.
2. Device according to claim 1, characterized in that the current key to the reference electrode C through the tubular counter-electrode D in the vicinity of the stationary mercury B electrode is guided.
3. Apparatus according to claim 1 and 2, characterized in that the inner electrolyte E is an alkaline buffer solution, in particular ene sodium carbonate-sodium bicarbonate buffer solution.
For this 1 page drawing
Field of application of the invention
The invention relates to a device for the electrochemical determination of small amounts of ammonia in gases. The device can be used as a detector when exceeding specified low concentrations of ammonia. In addition to the use as an alarm device and a quantitative determination of ammonia is thus possible.
Characteristic of the known state of the art
The known electrochemical devices for the determination of ammonia in gases are more potentiometric (K. Cammann, "Working with ion-sensitive electrodes", p 165 [1977]) and voltammetric type. (G. Chuiton, Pollut. Atmos 17 (1975) These known devices have the disadvantage of lower specificity due to their measuring method, whereby a greater design effort is required to achieve sufficient selectivity.
Object of the invention
The aim of the invention is to provide an ammonia-specific sensor which, in contrast to the above-mentioned known devices has a high specificity and sensitivity with reduced design complexity.
Explanation of the essence of the invention
The object of the invention is to achieve a high selectivity by the application of a reaction specific to ammonia during the electrode process in a specially developed for the process voltametric device with three-electrode technology for the measuring method, wherein the device in combination with a gas-permeable membrane and an auxiliary electrode trouble-free measurement of ammonia permits.
According to the invention, this object is achieved by the use of an ammonia-permeable membrane, an auxiliary electrode assembly and an ammonia-specific reaction, so that during the electrode process, the disturbances in potentiometric method (by K + , NR 3 H + etc.), in voltammetric and coulometric method by electrochemically active substances occur, can be eliminated. The device consists of a voltammetric cell in tube form, which has a referential electrode (preferably an Ag / AgCl electrode or saturated calomel electrode with diaphragm or an Ag / Ag 2 O electrode without diaphragm), a counter electrode of inert material! (preferably platinum or gold), a working electrode (stationary mercury electrode on platinum, gold, silver or glassy carbon) and an alkaline Leitelektroiyten buffered property (preferably sodium carbonate-sodium bicarbonate buffer). The working electrode is pressed on the underside of the arrangement against an ammonia-permeable PTFE membrane so that a galvanic contact with the other electrodes is ensured. When using an auxiliary electrode arrangement, this is inserted between the working electrode and the gas membrane so that the latter is not touched. The arrangement is cyclic-voltametrisch or chronoamperometrisch operated, wherein mercury is oxidized and reduced again. The action of ammonia leads to a current drop during the oxidation process.
DD31334188A 1988-03-03 1988-03-03 Device for the electrochemical determination of ammonia in gases DD271179A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DD31334188A DD271179A1 (en) 1988-03-03 1988-03-03 Device for the electrochemical determination of ammonia in gases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD31334188A DD271179A1 (en) 1988-03-03 1988-03-03 Device for the electrochemical determination of ammonia in gases

Publications (1)

Publication Number Publication Date
DD271179A1 true DD271179A1 (en) 1989-08-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DD31334188A DD271179A1 (en) 1988-03-03 1988-03-03 Device for the electrochemical determination of ammonia in gases

Country Status (1)

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DD (1) DD271179A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9835582B2 (en) 2005-09-30 2017-12-05 Ascensia Diabetes Care Holdings Ag Devices using gated voltammetry methods
US9933385B2 (en) 2007-12-10 2018-04-03 Ascensia Diabetes Care Holdings Ag Method of using an electrochemical test sensor
US10067082B2 (en) 2004-02-06 2018-09-04 Ascensia Diabetes Care Holdings Ag Biosensor for determining an analyte concentration
US10190150B2 (en) 2006-10-24 2019-01-29 Ascensia Diabetes Care Holdings Ag Determining analyte concentration from variant concentration distribution in measurable species

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10067082B2 (en) 2004-02-06 2018-09-04 Ascensia Diabetes Care Holdings Ag Biosensor for determining an analyte concentration
US9835582B2 (en) 2005-09-30 2017-12-05 Ascensia Diabetes Care Holdings Ag Devices using gated voltammetry methods
US10190150B2 (en) 2006-10-24 2019-01-29 Ascensia Diabetes Care Holdings Ag Determining analyte concentration from variant concentration distribution in measurable species
US9933385B2 (en) 2007-12-10 2018-04-03 Ascensia Diabetes Care Holdings Ag Method of using an electrochemical test sensor

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