DE937259C - Process for the electrochemical measurement of oxygen dissolved in liquids - Google Patents

Process for the electrochemical measurement of oxygen dissolved in liquids

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Publication number
DE937259C
DE937259C DET6207A DET0006207A DE937259C DE 937259 C DE937259 C DE 937259C DE T6207 A DET6207 A DE T6207A DE T0006207 A DET0006207 A DE T0006207A DE 937259 C DE937259 C DE 937259C
Authority
DE
Germany
Prior art keywords
anode
cathode
electrochemical measurement
compartment
diaphragm
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
DET6207A
Other languages
German (de)
Inventor
Fritz Dr-Ing Toedt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DET6207A priority Critical patent/DE937259C/en
Application granted granted Critical
Publication of DE937259C publication Critical patent/DE937259C/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/404—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Electrolytic Production Of Metals (AREA)

Description

Das Prinzip der elektrochemischen Sauerstoffmessung beruht auf der Tatsache, daß der Stromfluß geeigneter galvanischer Elemente von derjenigen Sauerstoffmenge abhängig ist, welche an der Kathode (der edleren Elektrode) elektrochemisch reduziert bzw. depolarisiert wird. Daher ist die abgelesene oder registrierte Stromstärke ein genaues Maß für die Konzentration an gelöstem Sauerstoff. The principle of electrochemical oxygen measurement is based on the The fact that the current flow of suitable galvanic elements depends on that amount of oxygen which is electrochemically reduced at the cathode (the nobler electrode) or is depolarized. Hence the current reading or registered is an accurate measure of the concentration of dissolved oxygen.

Wegen ihrer Einfachheit sowie wegen der zeitlich lückenlosen Erfassung von Änderungen des Sauerstoffgehaltes besitzt diese Methode besonders für biologische Anwendungen eine große praktische Bedeutung. Hierbei ist es wichtig, daß die bei der Messung entstehenden Ionen des unedleren Metalls nicht in die Meßlösung, welche die Mikroorganismen enthält, gelangen. Bis zu einem gewissen Grad wird diese Bedingung zwar durch Abtrennung des Anodenraumes mit Hilfe eines Diaphragmas erreicht, aber selbst Spuren von gelösten Metallsalzen, welche durchs Diaphragma gelangen, können- die Ergebnisse verfälschen.Because of their simplicity as well as because of the timeless recording This method possesses changes in the oxygen content especially for biological ones Applications are of great practical importance. It is important that the The ions of the less noble metal produced during the measurement do not enter the measurement solution, which contains microorganisms. To some extent, this condition will achieved by separating the anode compartment with the help of a diaphragm, but even traces of dissolved metal salts that get through the diaphragm can- falsify the results.

Um derartige Fehler völlig auszuschließen, wird im Sinne der vorliegenden Erfindung zwischen Anoden- und Kathodenraum ein besonderer mit Salzlösung gefüllter Trennraum angebracht, welcher durch je-ein Diaphragma mit dem Kathodenraum und Anodenraum in elektrolytisch leitender Verbindung steht. Auf diese Weise gelangen die anodisch gelösten Metallionen, sobald sie bei der Messung durch Diffusion oder elektrolytische Uberführung das den Anodenraum begrenzende Diaphragma durchdringen, zunächst in denTrennraum. In order to completely rule out such errors, in the context of the present Invention between the anode and cathode space a special one filled with saline solution Separating space attached, which is connected to the cathode compartment and anode compartment by a diaphragm each is in electrolytically conductive connection. This is how the anodic gets dissolved metal ions as soon as they are measured by diffusion or electrolytic Transfer to penetrate the diaphragm delimiting the anode space, initially in the separation space.

Eine zeitweise Erneuerung der Salzlösung des Trennraumes bewirkt dann, daß keine Metallionen in den Kathodenraum kommen.A temporary renewal of the salt solution in the separation space then causes that no metal ions get into the cathode compartment.

Als Salzlösungen für den Anodenraum und den Trennraum sind beispielsweise gesättigte Kochsalzlösungen oder gesättigte Kaliumchloridlösungen geeignet. The salt solutions for the anode space and the separation space are, for example saturated saline solutions or saturated potassium chloride solutions are suitable.

Die Wirkungsweise der Meßanordnung ist in der Abbildung dargestellt. I ist die Anode, 2 die Kathode sowie 3, und 3b die beiden den Trennraum 4 vom Anodenraum und vom Kathodenraum abschließenden Diaphragmen. Am Galvanometer 5 wird der Sauerstoffgehalt abgelesen oder registriert. The function of the measuring arrangement is shown in the figure. I is the anode, 2 the cathode and 3, and 3b the two separating space 4 from the anode space and diaphragms closing off the cathode compartment. The oxygen content is measured on the galvanometer 5 read or registered.

6 und 7 sind Zuleitung und Ableitung für die zu messende Flüssigkeit sowie für eine Gasdurchleitung. 8, und 8o sind Hähne zur Erzielung eines Luftabschlusses. Als Kathodenmetall haben sich die Edelmetalle Gold und Platin als geeignet erwiesen. Als Anode ist bei PH 7 und darüber Zinn, zwischen PH 5 und 7 Eisen und bei tieferen pn-Werten Blei brauchbar.6 and 7 are supply and discharge lines for the liquid to be measured as well as for a gas passage. 8, and 8o are taps to achieve an air seal. The noble metals gold and platinum have proven to be suitable as cathode metals. The anode is tin for PH 7 and above, iron between PH 5 and 7 and lower ones pn values lead usable.

Claims (1)

PATENTANSPRUCH: Verfahren zur elektrochemischen Messung des in Wasser gelösten Sauerstoffs unter Verwendung eines galvanischen Elementes, dessen Stromlieferung nur von der an die Kathode gelangenden und dort depolarisierend wirkenden Sauerstoffmenge abhängig ist, dadurch gekennzeichnet, daß zwischen dem Anodenraum und dem Kathodenraum ein besonderer mit Salzlösung gefüllter Trennraum angebracht wird, welcher durch je ein Diaphragma mit dem Anoden- und Kathodenraum in elektrolytisch leitende Verbindung gebracht wird, so daß die durch das Anodendiaphragma gelangenden Metallionen vom Kathodenraum ferngehalten werden. PATENT CLAIM: Method for the electrochemical measurement of the in water dissolved oxygen using a galvanic element, its current delivery only on the amount of oxygen reaching the cathode and having a depolarizing effect there is dependent, characterized in that between the anode compartment and the cathode compartment a special separation space filled with saline solution is attached through which One diaphragm each with the anode and cathode compartment in electrolytically conductive connection is brought so that the metal ions passing through the anode diaphragm from Cathode compartment are kept away.
DET6207A 1952-05-20 1952-05-20 Process for the electrochemical measurement of oxygen dissolved in liquids Expired DE937259C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET6207A DE937259C (en) 1952-05-20 1952-05-20 Process for the electrochemical measurement of oxygen dissolved in liquids

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET6207A DE937259C (en) 1952-05-20 1952-05-20 Process for the electrochemical measurement of oxygen dissolved in liquids

Publications (1)

Publication Number Publication Date
DE937259C true DE937259C (en) 1955-12-29

Family

ID=7545240

Family Applications (1)

Application Number Title Priority Date Filing Date
DET6207A Expired DE937259C (en) 1952-05-20 1952-05-20 Process for the electrochemical measurement of oxygen dissolved in liquids

Country Status (1)

Country Link
DE (1) DE937259C (en)

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