WO2014092540A2 - An aquatic pollutant sensor - Google Patents

An aquatic pollutant sensor Download PDF

Info

Publication number
WO2014092540A2
WO2014092540A2 PCT/MY2013/000241 MY2013000241W WO2014092540A2 WO 2014092540 A2 WO2014092540 A2 WO 2014092540A2 MY 2013000241 W MY2013000241 W MY 2013000241W WO 2014092540 A2 WO2014092540 A2 WO 2014092540A2
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
percent
reference electrode
transducer
inert
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.)
Ceased
Application number
PCT/MY2013/000241
Other languages
French (fr)
Other versions
WO2014092540A3 (en
Inventor
Ahmad Mohd Rais
Alva Sagir
Embong SAAT SHUKRI
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.)
Mimos Bhd
Original Assignee
Mimos Bhd
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 Mimos Bhd filed Critical Mimos Bhd
Publication of WO2014092540A2 publication Critical patent/WO2014092540A2/en
Publication of WO2014092540A3 publication Critical patent/WO2014092540A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • G01N27/28—Electrolytic cell components
    • G01N27/30—Electrodes, e.g. test electrodes; Half-cells
    • G01N27/333—Ion-selective electrodes or membranes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G01N33/1826—Organic contamination in water

Definitions

  • the present invention relates to a continuous aquatic pollutant sensor.
  • Pollutant/chemical sensors such as ion selective electrode (ISE) or ion sensitive field effect transistor (ISFET) typically use plasticized lipophilic sensing membrane to achieve selectivity for the target analyte. Upon long exposure in aqueous media the plasticizer molecules leach out and the sensing membrane becomes too hard.
  • ISE ion selective electrode
  • ISFET ion sensitive field effect transistor
  • One of the examples of water sensor which bearing said problems isEP0651248 which relates towater quality sensor apparatus comprising a substrate on which a plurality of sensors are supported in spaced apart relationship, each sensor being responsive to a different water characteristic and each sensor comprising a sensor region which, in use, is arranged to be contiguous with water the characteristics of which are to be sensed, which sensor regions are electrically connected to connector means via conductors supported on the substrate, the conductors and the connector means being arranged to be non-contiguous with the water in use of the apparatus. Therefore there is a need for a sensor which overcomes such problems.
  • the present invention provides
  • anaquatic pollutant sensor comprising: a transducer (101) as sensing electrode to convert analyte concentrations to voltage signals; an ion selective layer (103) deposited on the transducer (101) to selectively transport target analyte to the said transducer (101); potentiometry readout circuit (105) to measure potential difference between chemical sensor and reference electrode; an inert sensor tip substrate (107) having at least one sensor opening, at least one reference electrode opening and at least two tracks for wire traces; a protector (109) to provide mechanical strength, reduce fouling and allow cleaning; and a reference electrode (111); characterized in that the transducer (101) further comprising an electrochemical transducer nanocomposit; the reference electrode (111) is in the form of solid; and the protector (109) further comprising an inert porous protective encapsulation.
  • the proposed invention is advantageous for ion selective chemical sensors intended for long term exposure in aqueous media and in situ measurement due the electrochemical transducer nanocomposite (101) ensures that the transduced signals represent accurate detection of analyte at sub-ppm levels, with negligible error due to signal drift or noise.
  • the solid reference electrode (111) does not need liquid electrode and thus maintenance free and suitable for field deployment, and the inert sensor tip substrate (107) and the porous protective encapsulation (109) provide mechanical strength, reduce fouling and allow cleaning.
  • Figure 1 illustrates cross section view of the sensor tip substrate (107) of the present invention.
  • Figure 2 illustrates top view of the sensor tip substrate (107) of the present
  • Figure 3 illustrates the electrochemical transducer nanocomposite (101) and the ion selective layer (103) of the present invention.
  • Figure 4 illustrates the solid reference electrode (111) of the present invention.
  • Figure 5 illustrates flowchart of a method for preparing an aquatic pollutant sensing procedure of the present invention.
  • the present invention relates toanaquatic pollutant sensor comprising:a transducer (101) as sensing electrode to convert analyte concentrations to voltage signals; an ion selective layer (103) deposited on the transducer (101) to selectively transport target analyte to the said transducer (101); potentiometry readout circuit (105) to measure potential difference between chemical sensor and reference electrode; an inert sensor tip substrate (107) having at least one sensor opening, at least one reference electrode opening and at least two tracks for wire traces; a protector (109) to provide mechanical strength, reduce fouling and allow cleaning; and a reference electrode (111); characterized in that the transducer (101) further comprising an electrochemical transducer nanocomposite; the reference electrode (111) is in the form of solid; and the protector (109) further comprising an inert porous protective encapsulation.
  • Figure 1 and Figure 2 shows the following main features: inert electrode holders (1), (2) are for housing sensing electrodes, inert holder (3) for housing the solid reference electrode (111), a temperature sensor (4) encapsulated with inert materials, wire traces (5), (10) and electrical contact connecting the traces (5), (10) to the readout circuit (105).
  • a chemical resistant o-ring (6) prevents water or analyte from entering the electronics board.
  • a sensor tip (7) is for securing the sensor/transducer (101) and reference electrode holders (3) on the inert substrate (107) and providing channels for electrical wire tracings from the electrodes to the electrical contact.
  • the inert porous protective encapsulation (109) comprising porous and curved windows on top of the sensor (101) and reference electrode (111) surfaces.
  • the inert porous protective encapsulation (109) further comprising: protective windows having at least flat surface, at least 0.5mm thickness and at least 0.5um pore size, having direct contact with or detached from the sensor tip substrate.
  • the inert porous protective encapsulation (109) having flat or curved surface which is detachable from the sensor tip substrate (107) and having fitting tracks.
  • FIG. 3 illustrates the electrochemical transducer nanocomposite (101) and the ion selective layer (103) of the present invention which make up the sensing electrode.
  • An inert cup (11), preferably made of Teflon materials, is for holding the compacted solid sensing electrode.
  • a conductive adhesive (16) is to secure the electrode to the inert casing, holding the wire tracing and give adhesion with the compacted electrode.
  • the electrochemical transducer nanocompositenanocomposite (101) further comprising: 1 to 30 percent graphite; 1 to 5 percent clay nanoparticles; 3 to 30 percent doped polypyrrole nanoparticles; and 0.1 to 5 percent carbon nanotubes of total weight.
  • the ion selective sensing layer (103) further comprising: 0.2 to 3 percent lipophilic salt; 0.2 to 8 percent ionophore; 30 to 90 percent polymeric matrix; and 0 to 10 percent polypyrrole of total weight, configuredfor selective determination of ionic chemical analyte.
  • the inert porous protective encapsulation (109), preferably made of Teflon is to avoid fouling of the sensor surface, to allow washing of the cap surface and to provide mechanical strength to the sensing composite.
  • FIG 4 illustratesthe solid reference electrode (111) of the present invention.
  • the reference electrode (111) further comprising: 1 to 30 percent graphite; 1 to 5 percent clay nanoparticles; 3 to 30 percent silver nanoparticles; 3 to 30 percent silver chloride; 1 to 30 percent chloride salt; and 0.1 to 5 percent carbon nanotubes of total weight.
  • the conductive adhesive (16) is to secure the electrode (111) to the inert casing, holding the wire tracing and give adhesion with the sensing electrode (101).
  • a chemical sensors having inert sensor tip substrate (107) and inert porous protective encapsulation (109) configured to detect aquatic pollutant; a solid reference electrode (111) configured to complete readout circuit for potentiometry measurement; a potentiometry readout circuit (105) configured to measure potential difference between chemical sensor and reference electrode; an analog to digital converter circuit configured to digitize sensor signal; a microcontroller circuit configured to convert electrical signal to chemical concentration; and a radio transmitter circuit to transmit sensor and system data via wireless transmission.
  • Figure 5 illustrates flowchart of a method for preparing an aquatic pollutant sensing procedure of the present invention.
  • the method for preparing an aquatic pollutant sensing procedure comprising: fabricating an inert sensor tip substrate (201); fabricating an inert porous protective encapsulation (203); securing electrochemical transducer nanocomposite and reference electrode in the sensor tip substrate with conducting adhesive (205); depositing ion selective layer on the electrochemical transducer (207); connecting the sensor and reference electrode wire traces to a potentiometry circuit (209); recording the emf signals in target analyte solutions, at least two points between 10 1 M and 10 6 M (211); and plotting emf values (mV) versus log activity of analyte concentrations (213).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

The present invention relates to an aquatic pollutant sensor comprising: a transducer (101) as sensing electrode to convert analyte concentrations to voltage signals; an ion selective layer (103) deposited on the transducer (101) to selectively transport target analyte to the said transducer (101); potentiometry readout circuit (105) to measure potential difference between chemical sensor and reference electrode; an inert sensor tip substrate (107) having at least one sensor opening, at least one reference electrode opening and at least two tracks for wire traces; a protector (109) to provide mechanical strength, reduce fouling and allow cleaning; and a reference electrode (111); characterized in that the transducer (101) further comprising an electrochemical transducer nanocomposite; the reference electrode (111) is in the form of solid; and the protector (109) further comprising an inert porous protective encapsulation.

Description

Description
Title of Invention: AN AQUATIC POLLUTANT SENSOR
[ 1 ] FIELD OF INVENTION
[2] The present invention relates to a continuous aquatic pollutant sensor.
[3] BACKGROUND OF THE INVENTION
[4] Pollutant/chemical sensors such as ion selective electrode (ISE) or ion sensitive field effect transistor (ISFET) typically use plasticized lipophilic sensing membrane to achieve selectivity for the target analyte. Upon long exposure in aqueous media the plasticizer molecules leach out and the sensing membrane becomes too hard.
Moreover, the membrane adhesion to electrode becomes weaker and the membrane could delaminate. Both reasons result in functional failure of the sensors. There are many issues encountered in measuring analytes in the field and problems suffered by field deployed chemical sensors, such as conventional pollutant analysis methods use chemical reagents and analytical instruments, available pollutant monitoring sensors integrate large sensor probes, existing chemical sensors use liquid electrolytes in reference electrode, continuous monitoring in polluted environment causes foulingon sensor element/tip, and long exposure to aqueous media causes delamination of polymeric sensing membranes.
[5] One of the examples of water sensor which bearing said problems isEP0651248 which relates towater quality sensor apparatus comprising a substrate on which a plurality of sensors are supported in spaced apart relationship, each sensor being responsive to a different water characteristic and each sensor comprising a sensor region which, in use, is arranged to be contiguous with water the characteristics of which are to be sensed, which sensor regions are electrically connected to connector means via conductors supported on the substrate, the conductors and the connector means being arranged to be non-contiguous with the water in use of the apparatus. Therefore there is a need for a sensor which overcomes such problems.
[6] SUMMARY OF THE INVENTION
[7] According to an aspect of the present invention, the present invention provides
anaquatic pollutant sensor comprising:a transducer (101) as sensing electrode to convert analyte concentrations to voltage signals; an ion selective layer (103) deposited on the transducer (101) to selectively transport target analyte to the said transducer (101); potentiometry readout circuit (105) to measure potential difference between chemical sensor and reference electrode; an inert sensor tip substrate (107) having at least one sensor opening, at least one reference electrode opening and at least two tracks for wire traces; a protector (109) to provide mechanical strength, reduce fouling and allow cleaning; and a reference electrode (111); characterized in that the transducer (101) further comprising an electrochemical transducer nanocomposit; the reference electrode (111) is in the form of solid; and the protector (109) further comprising an inert porous protective encapsulation.
[8] The proposed invention is advantageous for ion selective chemical sensors intended for long term exposure in aqueous media and in situ measurement due the electrochemical transducer nanocomposite (101) ensures that the transduced signals represent accurate detection of analyte at sub-ppm levels, with negligible error due to signal drift or noise. The solid reference electrode (111) does not need liquid electrode and thus maintenance free and suitable for field deployment, and the inert sensor tip substrate (107) and the porous protective encapsulation (109) provide mechanical strength, reduce fouling and allow cleaning.
[9] BRIEF DESCRIPTION OF THE DRAWINGS
[10] Figure 1 illustrates cross section view of the sensor tip substrate (107) of the present invention.
[11] Figure 2 illustrates top view of the sensor tip substrate (107) of the present
invention.
[12] Figure 3 illustrates the electrochemical transducer nanocomposite (101) and the ion selective layer (103) of the present invention.
[13] Figure 4 illustrates the solid reference electrode (111) of the present invention.
[14] Figure 5 illustrates flowchart of a method for preparing an aquatic pollutant sensing procedure of the present invention.
[15] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[16] Generally, the present invention relates toanaquatic pollutant sensor comprising:a transducer (101) as sensing electrode to convert analyte concentrations to voltage signals; an ion selective layer (103) deposited on the transducer (101) to selectively transport target analyte to the said transducer (101); potentiometry readout circuit (105) to measure potential difference between chemical sensor and reference electrode; an inert sensor tip substrate (107) having at least one sensor opening, at least one reference electrode opening and at least two tracks for wire traces; a protector (109) to provide mechanical strength, reduce fouling and allow cleaning; and a reference electrode (111); characterized in that the transducer (101) further comprising an electrochemical transducer nanocomposite; the reference electrode (111) is in the form of solid; and the protector (109) further comprising an inert porous protective encapsulation.
[17] Figure 1 and Figure 2 shows the following main features: inert electrode holders (1), (2) are for housing sensing electrodes, inert holder (3) for housing the solid reference electrode (111), a temperature sensor (4) encapsulated with inert materials, wire traces (5), (10) and electrical contact connecting the traces (5), (10) to the readout circuit (105). A chemical resistant o-ring (6) prevents water or analyte from entering the electronics board. A sensor tip (7) is for securing the sensor/transducer (101) and reference electrode holders (3) on the inert substrate (107) and providing channels for electrical wire tracings from the electrodes to the electrical contact. The inert porous protective encapsulation (109) comprising porous and curved windows on top of the sensor (101) and reference electrode (111) surfaces. The inert porous protective encapsulation (109) further comprising: protective windows having at least flat surface, at least 0.5mm thickness and at least 0.5um pore size, having direct contact with or detached from the sensor tip substrate.The inert porous protective encapsulation (109) having flat or curved surface which is detachable from the sensor tip substrate (107) and having fitting tracks.
[18] Figure 3 illustrates the electrochemical transducer nanocomposite (101) and the ion selective layer (103) of the present invention which make up the sensing electrode. An inert cup (11), preferably made of Teflon materials, is for holding the compacted solid sensing electrode. A conductive adhesive (16) is to secure the electrode to the inert casing, holding the wire tracing and give adhesion with the compacted electrode. The electrochemical transducer nanocompositenanocomposite (101) further comprising: 1 to 30 percent graphite; 1 to 5 percent clay nanoparticles; 3 to 30 percent doped polypyrrole nanoparticles; and 0.1 to 5 percent carbon nanotubes of total weight.The ion selective sensing layer (103) further comprising: 0.2 to 3 percent lipophilic salt; 0.2 to 8 percent ionophore; 30 to 90 percent polymeric matrix; and 0 to 10 percent polypyrrole of total weight, configuredfor selective determination of ionic chemical analyte. The inert porous protective encapsulation (109), preferably made of Teflon is to avoid fouling of the sensor surface, to allow washing of the cap surface and to provide mechanical strength to the sensing composite.
[19] Figure 4 illustratesthe solid reference electrode (111) of the present invention.The reference electrode (111) further comprising: 1 to 30 percent graphite; 1 to 5 percent clay nanoparticles; 3 to 30 percent silver nanoparticles; 3 to 30 percent silver chloride; 1 to 30 percent chloride salt; and 0.1 to 5 percent carbon nanotubes of total weight. The conductive adhesive (16) is to secure the electrode (111) to the inert casing, holding the wire tracing and give adhesion with the sensing electrode (101).
[20] Taking the present invention as basis, theaquatic pollutant sensing system
comprising: a chemical sensors having inert sensor tip substrate (107) and inert porous protective encapsulation (109) configured to detect aquatic pollutant; a solid reference electrode (111) configured to complete readout circuit for potentiometry measurement; a potentiometry readout circuit (105) configured to measure potential difference between chemical sensor and reference electrode; an analog to digital converter circuit configured to digitize sensor signal; a microcontroller circuit configured to convert electrical signal to chemical concentration; and a radio transmitter circuit to transmit sensor and system data via wireless transmission.
[21] After having the present invention as basis of the sensing system, Figure 5 illustrates flowchart of a method for preparing an aquatic pollutant sensing procedure of the present invention. The method for preparing an aquatic pollutant sensing procedure comprising: fabricating an inert sensor tip substrate (201); fabricating an inert porous protective encapsulation (203); securing electrochemical transducer nanocomposite and reference electrode in the sensor tip substrate with conducting adhesive (205); depositing ion selective layer on the electrochemical transducer (207); connecting the sensor and reference electrode wire traces to a potentiometry circuit (209); recording the emf signals in target analyte solutions, at least two points between 10 1 M and 106 M (211); and plotting emf values (mV) versus log activity of analyte concentrations (213).
[22] Although the invention has been described with reference to particular embodiment, it is to be understood that the embodiment is merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiment that other arrangements may be devised without departing from the scope of the present invention as defined by the appended claims.

Claims

Claims
[Claim 1] An aquatic pollutant sensor comprising:
atransducer (101) as sensing electrode to convert analyte concentrations to voltage signals;
ionselective layer (103) deposited on the transducer (101) to selectively transport target analyte to the said transducer (101);
potentiometryreadout circuit (105) to measure potential difference between chemical sensor and reference electrode;
an inert sensor tip substrate (107) having at least one sensor holder (1),(2), at least one reference electrode holder (3) and at least two tracks for wire traces (5), (10);
aprotector (109) to provide mechanical strength, reduce fouling and allow cleaning; and
areference electrode (111);
characterizedin that
thetransducer (101) further comprising an electrochemical transducer nanocomposite; the reference electrode (111) is in the form of solid; and the protector (109) further comprising an inert porous protective encapsulation.
[Claim 2] An aquatic pollutant sensor as claimed in Claim 1, wherein the
reference electrode (109) further comprising:
1 to 30 percent graphite; 1 to 5 percent clay nanoparticles; 3 to 30 percent silver nanoparticles; 3 to 30 percent silver chloride; 1 to 30 percent chloride salt; and 0.1 to 5 percent carbon nanotubes of total weight.
[Claim 3] An aquatic pollutant sensor as claimed in Claim 1, wherein the electrochemical transducer nanocomposite (101) further comprising: 1 to 30 percent graphite; 1 to 5 percent clay nanoparticles; 3 to 30 percent doped polypyrrole nanoparticles; and 0.1 to 5 percent carbon nanotubes of total weight.
[Claim 4] An aquatic pollutant sensor as claimed in Claim 1, wherein the ion selective layer (103) further comprising: 0.2 to 3 percent lipophilic salt;
0.2 to 8 percent ionophore; 30 to 90 percent polymeric matrix; and 0 to
10 percent polypyrrole of total weight.
[Claim 5] An aquatic pollutant sensor as claimed in Claim 2, wherein the clay nanoparticle further comprising: kaolin; bentonite; montmorillonite K
10; montmorillonite K 10; and illite.
[Claim 6] An aquatic pollutant sensor as claimed in Claim 1, wherein the inert porous protective encapsulation (109) further comprising: protective windows having at least flat surface, at least 0.5mm thickness and at least 0.5um pore size, having direct contact with or detached from the sensor tip substrate.
[Claim 7] An aquatic pollutant sensor as claimed in Claim 1, wherein the inert porous protective encapsulation (109) having flat or curved surface which is detachable from the sensor tip substrate (107) and having fitting tracks.
[Claim 8] An aquatic pollutant sensor as claimed in Claim 3, wherein the clay nanoparticle further comprising: kaolin; bentonite; montmorillonite K 10; montmorillonite K 10; and illite.
[Claim 9] An aquatic pollutant sensing system comprising:
achemical sensors having inert sensor tip substrate (107) and inert porous protective encapsulation (109) configured to detect aquatic pollutant;
asolid reference electrode (111) configured to complete readout circuit for potentiometry measurement;
apotentiometry readout circuit (105) configured to measure potential difference between chemical sensor and reference electrode;
ananalog to digital converter circuit configured to digitize sensor signal;
amicrocontroller circuit configured to convert electrical signal to chemical concentration; and
aradio transmitter circuit to transmit sensor and system data via wireless transmission.
[Claim 10] A method for preparing an aquatic pollutant sensing comprising:
fabricatingan inert sensor tip substrate (201);
fabricatingan inert porous protective encapsulation (203);
securingelectrochemical transducer nanocomposite and reference electrode in the sensor tip substrate with conducting adhesive (205); depositingion selective layer on the electrochemical transducer (207); connectingthe sensor and reference electrode wire traces to a potentiometry circuit (209);
recordingthe emf signals in target analyte solutions, at least two points between 10 1 M and 106 M (211); and
plottingemf values (mV) versus log activity of analyte concentrations (213).
PCT/MY2013/000241 2012-12-10 2013-12-09 An aquatic pollutant sensor Ceased WO2014092540A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI2012005325 2012-12-10
MYPI2012005325A MY163549A (en) 2012-12-10 2012-12-10 An aquatic pollutant sensor

Publications (2)

Publication Number Publication Date
WO2014092540A2 true WO2014092540A2 (en) 2014-06-19
WO2014092540A3 WO2014092540A3 (en) 2014-10-23

Family

ID=50156834

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/MY2013/000241 Ceased WO2014092540A2 (en) 2012-12-10 2013-12-09 An aquatic pollutant sensor

Country Status (2)

Country Link
MY (1) MY163549A (en)
WO (1) WO2014092540A2 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5378343A (en) * 1993-01-11 1995-01-03 Tufts University Electrode assembly including iridium based mercury ultramicroelectrode array

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
MY163549A (en) 2017-09-29
WO2014092540A3 (en) 2014-10-23

Similar Documents

Publication Publication Date Title
US20250102458A1 (en) Ion selective sensor
US6478950B1 (en) Sensing liquids in oil well using electrochemical sensor
CN102439431B (en) Device for providing a means for internal calibration in an electrochemical sensor
US4613422A (en) Ambient sensing devices
JP6503186B2 (en) Specimen sensing device
US8266795B2 (en) Methods of making an electrochemical gas sensor
US20170160228A1 (en) Potentiometric sensor
US20150082874A1 (en) Sensor array
CN102980931B (en) All-solid-state selective electrode based on functional ion liquid and preparation method of all-solid-state selective electrode
JP2025505358A5 (en)
US20070018652A1 (en) Micro sensor system for liquid conductivity, temperature and depth
WO2014092540A2 (en) An aquatic pollutant sensor
Pfeffer et al. A cost-effective, impediometric Na+-sensor in fluids
US20150323485A1 (en) A reference electrode and an arrangement for an electrochemical measurement
US8608927B2 (en) Ion sensor
KR101780668B1 (en) COMBINATION pH SENSORS HAVING SURFACE RENEWABLE SENSING PART, AND BOTTOM-UP TYPE SPOTTABLE COMBINATION pH SENSORS USING THE SAME
Park et al. All-Solid-State Ion-selective Electrodes for Wearable Healthcare Devices
ITGE970106A1 (en) MICROELECTRONIC PROBE FOR AUTOMATIC AND CONTEMPORARY CONTROL AND MONITORING OF DIFFERENT LIQUID AND THEIR CHEMICAL-PHYSICAL PARAMETERS
Son et al. Fabrication of low-cost and flexible potassium ion sensors based on screen printing and their electrochemical characteristics
CA1228895A (en) Ambient sensing devices
RU2260820C1 (en) Device for researching waters in wells
Amreen et al. based Electrodes for Detection of Neurotransmitters
ES2304265A1 (en) INTEGRATED MULTISENSOR FOR THE DETERMINATION OF PHYSICAL-CHEMICAL PARAMETERS OF LIQUID EFFLUENTS.
RU85660U1 (en) DEVICE FOR MEASURING HYDROPHYSICAL PARAMETERS OF SEA WATER
Prakash et al. A microfabricated impedance sensor for ionic transport in nanopores

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13831881

Country of ref document: EP

Kind code of ref document: A2

122 Ep: pct application non-entry in european phase

Ref document number: 13831881

Country of ref document: EP

Kind code of ref document: A2