433 results about "Ion selective electrode" patented technology

The invention is a polymeric reference electrode having properties equal to or superior to prior art electrodes without the presence of a plasticizer and in which such properties are achieved by incorporation in the membrane of a polymer with a sufficiently low glass transition temperature (T_g) to mimic the characteristics of a highly plasticized thermoplastic membrane. Preferred polymers are the polyacrylates, preferably with a linear backbone and pendant substituent groups. The membrane may further include lipophilic polymers and lipophilic additives, such as salts. In the reference electrode the membrane is overlaid on an internal electrode comprised of an internal contact optionally coated with an electrolyte and entrapped in a hydrophilic polymer. The polymeric reference electrode is preferably for use in the context of an ion selective electrode assembly.

In the mass spectrometer of the present invention, a flight space is provided before the mass analyzer, and the flight space includes a loop orbit on which ions fly repeatedly. While ions fly on the loop orbit repeatedly, ion selecting electrodes placed on the loop orbit selects object ions having a specific mass to charge ratio in such a manner that, for a limited time period when the object ions are flying through the ion selecting electrodes, an appropriate voltage is applied to the ion selecting electrodes to make them continue to fly on the loop orbit, but otherwise to make or let other ions deflect from the loop orbit. If ions having various mass to charge ratios are introduced in the loop orbit almost at the same time, the object ions having the same mass to charge ratio continue to fly on the loop orbit in a band, but ions having mass to charge ratios different from that are separated from the object ions while flying on the loop orbit repeatedly. Even if the difference in the mass to charge ratio is small, the separation becomes large when the number of turns of the flight becomes large. After such a separation is adequately achieved, the ion selecting electrodes can select the object ions with high selectivity, or at high mass resolution. By adding dissociating means, fragment ions originated only from the selected object ions can be analyzed, which enables the identification and structural analysis of the sample at high accuracy.

The invention discloses an ion-selective electrode based on a graphene electrode, comprising an electrode base body and an ion-selective polymer film coated on the surface of the electrode base body, wherein the electrode base body is an electrode doped with graphene or decorated by a graphene film on the electrode surface by electro-deposition. The ion-selective electrode, provided by the invention, has the advantages of simple preparation, low cost, fast electron transfer, stable potential, high sensitivity, good selectivity and the like, is applied to detection of ion concentration in solution, and provides a new idea to development of the ion-selective electrode towards a microelectrode aspect.

Devices and methods for measuring a target ion concentration uses an electrode pair. The pair includes a working electrode and a reference electrode. The working and reference electrodes are ion-selective electrodes (ISEs). The reference ISE can include a sodium ISE. The ISE pair interacts with body fluids where a target ion concentration changes more than sodium ion concentration over time. Some ISE membranes of a pair vary essentially only in the ionophore. An ISE pair can determine the ratio of a target ion concentration to sodium ion concentration in vivo. Periodic measurement of sodium concentration in drawn blood can be used to calibrate an ISE pair and provide target ion concentration as an output. Or, a potassium/sodium ISE pair beneficially monitors potassium concentration changes over time in heart- or kidney-failure patients. Then, manual or automatic titration of a diuretic material can be implemented to maintain a desired potassium concentration.

The invention discloses a full-solid potassium ion sensor, which comprises a substrate, a potassium ion selective electrode and an external reference electrode, wherein the potassium ion selective electrode and the external reference electrode are positioned in parallel on the substrate; both the potassium ion selective electrode and the external reference electrode comprise a reaction electrode,a contact electrode and a conductive lead for connecting the two electrodes; the reaction electrode is provided with an electrolyte layer; the electrolyte layer of the potassium ion selective electrode is provided with a potassium ion sensitive film; the electrolyte layer of the external reference electrode is provided with a reference film; and an insulating layer encircles the potassium ion sensitive film and the reference film and is provided with an opening for exposing the potassium ion sensitive film and the reference film, wherein the opening is used as a reaction area contacting solution to be detected during practical detection. The traditional potassium ion selective electrode and the traditional external reference electrode are integrated on the substrate, so the potassium ion sensor realizes microminiaturization and has the advantages of convenience for carrying, simple operation and rapid response. The invention also provides a preparation method for the full-solid potassium ion sensor. The preparation method simplifies the manufacturing flow, reduces the manufacturing cost and is suitable for mass production.

Embodiments of the present disclosure relate generally to nutrient monitoring in an agricultural field, and more specifically to devices, systems and methods that provide real time analysis and monitoring of one or more nutrients using ion selective electrodes.

A hand-held portable drug monitoring system to detect and quantitate cocaine and other organic drugs in saliva, sweat, and surface wipes by using an ion selective electrode or an array of ion selective electrodes. The ion selective electrode has a cast membrane reference electrode and a sensing electrode with a hydrophobic polymer, a plasticizer, and an ionophore selective for the organic drug to be tested. The ion selective electrode can be connected to a converter that coverts a voltage reading from the ion selective electrode to a quantitative drug concentration level. Also disclosed is the related method of using an ion selective electrode to detect an organic drug in saliva, sweat, and surface wipes, the method of testing electrical contact in an ion selective electrode, and the method of making a cast membrane reference electrode.

The invention relates to the technical field of electrochemical sensors, and particularly relates to a solid contact type ion-selective electrode based on nanoporous gold and a preparation method of the solid contact type ion-selective electrode. The electrode comprises an electrode substrate and an ion-selective polymer film, wherein the ion-selective polymer film coats the surface of the electrode substrate through a dropping manner, and the electrode substrate is an electrode modified by the nanoporous gold. The ion-selective electrode can be applied to detecting the ion concentration of a solution. The ion-selective electrode provided by the invention has the advantages of simplicity in preparation and good stability, and a new idea is provided for the development of miniaturized ion-selective electrodes.

The invention relates to a sensor, in particular to an ion selective electrode based on a conducting polymer film and a preparation method thereof. The ion selective electrode based on the conducting polymer film aims at solving the problem that a traditional ion selective electrode with internal reference solution is difficult to miniaturize and is short in service life. The ion selective electrode comprises an insulation electrode shell, a metal platinum wire, conducting polymer, an ion selective electrode film and a filled gold contact. The metal platinum wire is fixed into the insulation electrode shell, the electrode is arranged on the metal platinum wire, one end of the metal platinum wire is connected with the filled gold contact, the other end of the metal platinum wire forms the conducting polymer on the surface of the metal platinum wire through cyclic voltammetry, and the ion selective electrode film covers the conducting polymer. The ion selective electrode based on the conducting polymer film has the advantages of being miniaturized, and long in service life.

Plasticizer-free ion-detecting sensors for detecting a target ion in a sample are provided. The sensor comprises a plasticizer-free copolymer comprised of polymerized units of methacrylate monomers and a polymerizable ion exchanger, wherein the methacrylated monomers have pendent alkyl groups of different length and wherein the functionalized ion-exchanger is grafted into the copolymer through covalent linkages. The ion exchanger comprises a C-derivative of a halogenated closo-dodecacarborane anion having a polymerizable moiety. Sensors of this invention include carrier-based ion-selective electrodes or optodes such as thin film ion-specific optodes, particle-based optodes, or bulk optodes.

The invention provides a preparation method and applications of graphene aerogel. The graphene aerogel is prepared by the following steps: oxidizing a graphene water solution, and then preparing the graphene aerogel through a hydrothermal method. The graphene aerogel can be used as an ion-selective electrode, and can be especially used as an ion-selective electrode to detect the nitrate ions. The graphene aerogel is innovatively used as an ion-selective electrode applied in electrochemical detection, the detection results are excellent, and the application range of graphene aerogel based materials is enlarged.

The invention disclosed is a total organic carbon (TOC) analyzer comprised of an electrochemical cell comprising a diamond-film electrode (2) doped with boron or other conductivity including material. The diamond-film electrode is the working electrode and carries out the oxidation of TOC to produce carbon dioxide. The apparatus further comprises sensors for detecting the carbon dioxide produced. Such sensors include but are not limited to a tunable diode laser (1) and/or ion-selective electrode (5). The invention also discloses a method for measuring TOC in an aqueous solution using a total organic carbon analyzer.

The invention relates to a method and a device for detecting a polymer film ion selective electrode. The method comprises the following steps of: putting a nucleic acid aptamer and polycation into a detection pond, and inserting a polycation selective electrode into the detection pond to generate a comparison signal; adding the nucleic acid aptamer into the detection tank, reacting with standard solution of a substance to be detected, adding the polycation, and inserting the polycation selective electrode into the detection pond to generate standard signals of the standard solution of the substance to be detected at different concentrations; obtaining a standard curve according to the standard signals and the comparison signal; adding liquid to be detected into the detection pond, adding the nucleic acid aptamer, reacting with the liquid to be detected, adding the polycation in the ratio to conduct the signals, and inserting the polycation selective electrode into the detection pond to generate a sample signal; and acquiring a signal to be detected according to the sample signal and the comparison signal, and acquiring the concentration of the liquid to be detected by the reference of the standard curve. The method is wide in application range, high in generality, large in electrode response signals and obvious in potential change, so the method is a marking-free and immobilization-free method.

Ion-selective electrode sensor systems, and methods of fabricating such systems, may be utilized to analyze microfluidic sample volumes, i.e., sample volumes on the order of 1 to 1000 microliters.

The invention relates to detection of heavy metal ions, in particular to a method and a device for detecting low-concentration heavy metal ions. The method comprises the following steps of: inserting an ion selective electrode into a solution containing ions to be detected at high concentration of 10<-2> to 10<-5>M and applying pulse current of -1*10<-4> to -1*10<2> mu A to ensure that two adjacent kinds of high-concentration solution to be detected can achieve a Nernst response, and adhering a polymer sensitive film to the bottom of the ion selective electrode; measuring the Nernst response of the solution containing the ions to be detected at the concentration of below a reference until the lowest detection limit of the ions is reached, wherein a potential value of the solution containing lower-concentration ions to be detected is used as the reference; drawing a standard curve according to the detected value and current and solution concentration values; and measuring the solution containing the ions to be detected at the unknown concentration by a gradually approaching method, and acquiring the concentration of a solution sample according to the applied current, the acquired potential value and the standard curve. By the method and the device, the detection limit of the ion selective electrode is obviously reduced, and the sensitivity of the electrode is improved.

The invention discloses a sodium ion sensor and a preparation method thereof. The sodium ion sensor comprises a substrate, a first sodium ion selection electrode, a second sodium ion selection electrode, a solid electrolyte reference layer, a sodium ion sensitive film, an insulating layer and a salt bridge, wherein the first sodium ion selection electrode comprises a first reaction electrode arranged on the substrate; the second sodium ion selection electrode comprises a second reaction electrode arranged on the substrate; the solid electrolyte reference layer covers the first reaction electrode and the second reaction electrode; the sodium ion sensitive film is arranged on the solid electrolyte reference layer; the insulating layer is arranged on the sodium ion sensitive film; a first opening and a second opening are formed in the insulating layer; the first opening is communicated with the sodium ion sensitive film to form a first reaction cavity; the second opening is communicated with the sodium ion sensitive film to form a second reaction cavity; the salt bridge is arranged on the insulating layer; one end of the salt bridge extends to the inside of the first reaction cavity; and the other end of the salt bridge extends to the inside of the second reaction cavity. Through the manner, the sodium ion sensor disclosed by the invention can be miniaturized, so that the sodium ion sensor is convenient to carry and convenient to operate.

Ion concentration measurement requires a calibration before the start of the measurement, and thus the start of the measurement is delayed for the calibration period. Hence, the calibration is made unnecessary by reading an electrode slope value specific to an ion selective electrode for measuring the concentration of particular ions dissolved in a test solution, from an information presenting unit of an ion selective electrode cartridge including the ion selective electrode.

The invention discloses an all-solid-state ion-selective electrode and a preparation method thereof, and a biosensor. The all-solid-state ion-selective electrode comprises a substrate, an electron conversion layer arranged on the outer surface of the substrate and containing graphene oxide, and a sensitive film layer arranged on the outer surface of the electron conversion layer. Thus, the stability of the all-solid-state ion-selective electrode can be effectively improved.

The invention relates to a test instrument for detecting electrolyte item and total carbon dioxide, wherein a power part for forming a liquid path comprises an aspirating needle which is fixed on a two-freedom rotary arm and is connected with a second two-way flow valve by a pipeline; the second two-way flow valve is connected with a main liquid suction push pump; a first two-way flow valve is connected with a cleaning pump and a cleaning liquid bottle by a pipeline; a measurement part for forming the liquid path comprises a reverse push flow injection hole, an electrolyte sensor module, a carbon dioxide reaction tank, a one-way flow valve and a waste liquid bottle which are sequentially connected by a pipeline; and the carbon dioxide reaction tank is connected with a carbon dioxide sensor by a two-way air valve. Compared with the prior art, the test instrument has the advantages that 1. after an ion test module formed by a plurality of ion-selective electrodes is adopted, the content of multiple electrolytes can be measured by a direct method; 2. the attachment is reduced to the utmost extent, so that cross contamination is reduced; and 3 the influence to the test accuracy caused by a long pipeline arranged behind the aspirating needle and the residual liquid of a pump valve part can be avoided.

An automated self-calibrating water quality monitoring sensor housing assembly includes a number of ion-selective electrodes combined in a single flow train to provide for the multi constituent analysis of a number of samples without direct intervention by a human operator. An operator can enter the laboratory, connect sample bottles to an intake manifold, activate the device, and download data once the analysis is complete. With the exception of periodic probe maintenance, the system is designed to be self-calibrating and self cleaning.

A reference electrode assembly having a constrained-diffusion liquid junction between a liquid junction solution and a sample solution having separate flow paths, said assembly comprising a flow cell having attached thereto a constraint comprising a region of porous material permeable to water and salts; a remote reservoir for holding said liquid junction solution; a means for moving said liquid junction solution from said reservoir to said constraint; and a reference contact region is provided. This unique configuration provides a reference electrode device of the constrained-diffusion liquid junction type useful in pH and/or ion-selective electrode (ISE) potentiometric sensors and is particularly suitable for use in a mini-integrated electrochemical analyzer.

The invention relates to a sensor, in particular to a high-sensitivity renewable potential sensor for multi-charge ions (polyion-selective electrode). Primary ions (target polyions) of an ion-exchanger-doped polymer film are pre-activated, the electrode is transferred into background electrolyte for activation after pre-activation, and thus the high-sensitivity polyion-selective electrode is obtained. The electrode can be regenerated by the high-concentration primary ions in testing solution during testing or after testing. For high sensitivity, the primary ions to be tested are inhibited in the external surface layer of the film based on the primary ion flow from a sensitive film phase to a film interface. For renewability, the primary ions need not to be completely eliminated from the film. No complex rotary disc electrode device or external current is needed for the sensor, the sensitivity and the renewability of the electrode are significantly improved, and the electrode also has great significance in the direct potential testing of polyions, the titration testing with a polyion electrode as a signal converter, the enzyme testing and the immunoassay.