Method for operating a measuring device having at least one probe, which has at least one ion selective electrode

A measurement device and probe measurement technology, which can be used in measurement devices, material electrochemical variables, material analysis by electromagnetic means, etc., and can solve problems such as increased readings

Inactive Publication Date: 2012-05-09
ENDRESS HAUSER CONDUCTA GESELLSCHAFT FUER MESS UND REGELTECHNIK MBH CO KG
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Problems solved by technology

[0011] However, such a solution has the disadvantage that the additional ISE has to be purchased and maintained and, for example, renewed at defined intervals by replacing the ion-selective membrane
In the case of an average concentration of potassium ions such as 20 mg / l, this results in an increase in the reading of ammonium-N by about 1 mg / l

Method used

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  • Method for operating a measuring device having at least one probe, which has at least one ion selective electrode
  • Method for operating a measuring device having at least one probe, which has at least one ion selective electrode

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Embodiment Construction

[0046] figure 1 The measuring device 1 shown schematically in the figure comprises a probe 13 comprising an electrode 2 with an ion-selective membrane 12 which has a specificity for certain measured ions, such as ammonium ions or nitrate ions. selective. When the ion-selective membrane 12 is in contact with the liquid 20 to be monitored, depending on the concentration of the ion to be measured in the liquid 20, the potential across the ion-selective membrane 12 increases. In the potentiometric measurement method, the potential rise on the membrane 12 is measured relative to the potential of the reference electrode 3 . The reference electrode 3 can be, for example, an Ag / AgCl electrode. In this embodiment, the ion-selective electrode 2 and the reference electrode 3 form a single-rod measuring chain 13 which is connected via an interface 14 to a measuring transducer 4 serving as a control unit of the measuring device 1 . The measuring signal of the probe 13 is the measuring ...

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Abstract

A method for operating a measuring device comprising the following steps: providing a first sample of the liquid; ascertaining an updated calibration function by means of a standard addition method, wherein the first sample is supplemented at least once with a standard solution, which has a known concentration of the measured ion; determining a measured value of concentration of the measured ion in the first sample; providing a second sample of the liquid; ascertaining a measured value of concentration of the measured ion in the second sample as a reference measured ion concentration (cref) by means of a reference method; and determining a difference (cdisturb) between the apparent measured ion concentration (capparent) and the reference measured ion concentration (cref) and deriving a correction value (ckorr) therefrom for future measured values of concentration of the measured ion in the liquid, as ascertained with the measuring device.

Description

technical field [0001] The invention relates to a method for operating a measuring device having at least one probe with at least one ion-selective electrode. Background technique [0002] In general, ion-selective electrodes (ISE) are electrochemical sensors, in which case the relative change in the equilibrium Galvani voltage between the measured medium and the sensing electrode is preferably significantly influenced by a certain ion Effects of activity changes. Such ion-selective electrodes allow a relatively simple and rapid determination of ion concentrations in different media, even for example in turbid and colored solutions. Ion-selective electrodes can be used, for example, in the analysis of process liquids and in the analysis of waste water. [0003] Potentiometric measurements with ion-selective electrodes correspond largely metrologically to the classic pH measurement technique, which is based on pH glass membrane electrodes. With reference to a reference ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/28G01N27/333G01N27/49
CPCG01N27/333
Inventor 斯特凡·维尔克安杰·哈尔比格丹尼尔·伊滕冈特·雅尔
Owner ENDRESS HAUSER CONDUCTA GESELLSCHAFT FUER MESS UND REGELTECHNIK MBH CO KG
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