Class / Patent application number | Description | Number of patent applications / Date published |
205778500 | For halogen or halogen containing compound | 26 |
20090229995 | Analysis of fluoride at low concentrations in acidic processing solutions - Low concentrations of fluoride ion in a semiconductor processing solution containing an acid are determined via fluoride ion specific electrode measurements corrected for the effect of the acid concentration. No reagents are used for the fluoride determination. | 09-17-2009 |
20090260995 | Polymer based biosensor - A biosensor comprising a conducting polymer and a facilitating agent that combine to form a polymeric matrix that interacts with electrophilic compounds, wherein an electrochemical property of the polymer is altered in the presence of an electrophilic compound. | 10-22-2009 |
20090321278 | Electrochemical sensor - A electrochemical sensor comprising a mounting having screen printed array of electrodes located thereon, the array comprising a reference electrode, a counter electrode and a plurality of working electrodes, wherein the working electrodes are each overlaid with an insulating layer of insulating material, the insulating layer having an array of apertures, exposing a respective array of working regions of the working electrodes, and a method of making same by applying screen printing technic, and a method of using same for chlorine determination. | 12-31-2009 |
20100320095 | DEVICE FOR MONITORING WATER QUALITY - A device for monitoring chlorine in water, the device comprising a chlorine sensor adapted to measure a chlorine concentration in water; and a controller adapted to facilitate conversion between an active mode during which water analysis may be performed, and a low energy sleep mode in which the chlorine sensor is still energized but water analysis may not be performed. In sleep mode, a polarization voltage is maintained on an electrode comprised in chlorine sensor, which allows for a substantial reduction in a stabilization time required by the electrode following connection to an energy source after having been disconnected. Conversion between the active mode and the sleep mode may be according to predetermined parameter such as, for example, a predetermined time period, upon receipt of an indication from a independent timer, or by remote initiation from an external source. | 12-23-2010 |
20110198239 | SIMULTANEOUS DETERMINATION OF CHLORINE AND CHLORATE IN SODIUM HYPOCHLORITE - A process for the simultaneous determination of chlorine and chlorate in sodium hypochlorite. First and second streams of sodium hypochlorite are provided. The first stream is treated to generate iodine indicative of chlorine. The second stream is treated to generate iodine indicative of chlorine and chlorate. The iodine of the first stream is subjected to an amperometric measuring cell to generate a first current proportional to a chlorine concentration of the first stream. The iodine of the second stream is subjected to an amperometric measuring cell to generate a second current proportional to the chlorine and chlorate concentration in the second stream. The first current is subtracted from the second current to determine an amount of chlorate. | 08-18-2011 |
20120145561 | Device for Measuring at Least One Property of Water - The invention relates to a device for measuring at least one physico-chemical parameter of water, said device including a means for measuring the concentration of active chlorine in the form of hypochlorous acid HOC1 in said water. According to the invention, said means for measuring the chlorine concentration in the form of hypochlorous acid HOC1 includes first ( | 06-14-2012 |
20130037422 | Method For Detecting A Concentration Of Chlorate-Ions In An Aqueous Solution, Apparatus For Detecting A Concentration Of Chlorate-Ions And Control Unit - An apparatus, a control unit and a method are provided for detecting a concentration of chlorate-ions in an aqueous solution containing different types of chlorine oxidants. By applying energy to a defined volume of the aqueous solution to trigger a transformation of substantially all chlorine oxidants and/or chlorine therein to chloride and/or chlorate, and detecting the concentration of chlorate-ions contained in the defined volume, a solution can be provided that enables a simple and cheap measurement for a concentration of chlorate ions in an aqueous solution and that is capable for online measurement of such chlorate concentrations. | 02-14-2013 |
20130153441 | METHOD AND APPARATUS FOR EVALUATING EX-SITU CHEMICAL DEGRADATION OF MEMBRANES - Disclosed herein are methods and devices for evaluating ex-situ chemical degradation of fuel cell membranes. One embodiment of a method for evaluating ex-situ chemical degradation of a membrane comprises submerging a membrane in Fenton solution in a reaction vessel with a non-reactive weight configured to maximize exposure of the membrane to the Fenton solution, sealing the reaction vessel, heating the reaction vessel at a fixed rate to a predetermined temperature, holding the reaction vessel at the predetermined temperature for a predetermined test period, cooling the reaction vessel to room temperature, removing the membrane and analyzing the Fenton solution for fluoride ions. | 06-20-2013 |
20130168264 | Method for Measuring HF Content in Lithium Secondary Battery Electrolyte and Analytical Reagent Composition Used in the Same - Provided are a method for measuring hydrofluoric acid content in a lithium secondary battery electrolyte and an analytical reagent composition used in the same. | 07-04-2013 |
20130292267 | Method And Apparatus For Measuring And Controlling Electrolytically-Active Species Concentration In Aqueous Solutions - A method is provided for measuring an electrolytically-active species concentration in an aqueous or non-aqueous solution for use in providing control of the concentration of the species in a source solution thereof based on the measurements. In the method, a sample containing an electrolytically-active species is added into a measurement cell that has a working electrode and an auxiliary electrode, and a constant current is applied to the measurement cell while the working and auxiliary electrodes are in contact with the sample with monitoring of voltage difference across the electrodes until a change in the voltage difference is detected. A feedback signal is generated based on a parameter of the change in the voltage difference that is directly proportional to the amount of the electrolytically-active species in the sample, which can be used for process control. An apparatus is also described. | 11-07-2013 |
20130334063 | Method of Detecting Analyte - This disclosure relates to a method of detecting an analyte. The method includes (1) contacting an aqueous solution containing the analyte with an electrochemical detector having a working electrode, a counter electrode, and a solid electrolyte, where the analyte includes a halogen or an oxy-halogen species and the solid electrolyte provides an electrical pathway between the working and counter electrodes; (2) applying a voltage to the detector; and (3) measuring the resultant current change in the detector. | 12-19-2013 |
20140083864 | ELECTROCHEMICAL SENSORS FOR TESTING WATER - An electrochemical sensor for the detection and analysis of an analyte in a solution is disclosed. The electrochemical sensor has an electrically non-conductive support; a plurality of electrodes on the support, each electrode having a first surface and an opposite second surface, said first surface facing towards the support and the second surface facing away from the support. The plurality of electrodes includes a reference electrode, a counter electrode, and a working electrode. The working electrode has a reagent composition containing a reagent for detecting an analyte applied directly to the second surface of the working electrode. | 03-27-2014 |
20140083865 | ELECTROCHEMICAL SENSORS FOR TESTING WATER - An electrochemical sensor for the detection and analysis of an analyte in a solution is disclosed. The electrochemical sensor has an electrically non-conductive support; a plurality of electrodes on the support, each electrode formed from an electrode material and having a first surface and an opposite second surface, said first surface facing towards the support and the second surface facing away from the support. The plurality of electrodes includes a reference electrode, a counter electrode, and a working electrode. The working electrode has a reagent composition containing a reagent for detecting an analyte applied directly to the second surface of the working electrode or dispersed throughout the electrode material of the working electrode. | 03-27-2014 |
20140291168 | MULTIPLE POTENTIAL BASED CHRONOAMPEROMETRIC FREE CHLORINE SENSORS - A chronoamperometric method and device to determine concentration of an electrochemically active species in a fluid and pH of the fluid. A plurality of sets of calibration relationships may be determined for a sensor in an aqueous solution, the sensor having one or more working electrodes and one or more reference electrodes. A first plurality of potentials may be applied across the working and reference electrodes of the sensor in solution, and a first plurality of currents and current differences obtained as a function of the applied first plurality of potentials. Concentration of an electrochemically active species may then be determined as a function of the obtained first plurality of currents and current differences using the plural sets of calibration relationships, and pH of the solution may be determined as a function of the obtained first plurality of currents and current differences using the plural sets of calibration relationships. | 10-02-2014 |
20160018358 | ANALYSIS OF SILICON CONCENTRATION IN PHOSPHORIC ACID ETCHANT SOLUTIONS - Low concentrations of silicon in an etchant solution comprising phosphoric acid, an organo-silicon compound and water are analyzed by adding predetermined concentrations of a carboxylic acid and fluoride ions to a test solution comprising a predetermined volume of the etchant solution, and measuring the potential of a fluoride ion specific electrode (FISE) in the test solution. Reaction with silicon ions in the test solution reduces the concentration of fluoride ions, which are present in stoichiometric excess, so that the silicon concentration of the etchant solution can be determined from the difference between the predetermined and measured concentrations of fluoride ions in the test solution. | 01-21-2016 |
20160097735 | Apparatus, Method and System for Detecting Salt in a Hydrocarbon Fluid - A method for determining a salt concentration of a hydrocarbon fluid using a conductivity sensor and a hydrocarbon testing solution includes forming the hydrocarbon testing solution. The electropolymerizable monomer is operable to form a resultant associated polymer at a peak potential of the electropolymerizable polymer. The method includes introducing the hydrocarbon testing solution into the conductivity sensor. The method includes inducing a range of potential across the hydrocarbon testing solution such that at least a portion of the electropolymerizable monomer polymerizes. The range of induced potential includes the peak potential of the electropolymerizable polymer. The method includes detecting a range of electrical current associated with the range of potential induced. The method also includes the step of determining the salt concentration of the hydrocarbon fluid using the range of potential induced and the range of electrical current detected. | 04-07-2016 |
205779500 | Gaseous halogen or halogen containing compound | 5 |
20090127134 | Gas Sample Analysis - A method of determining information about a gas sample includes:
| 05-21-2009 |
20100147705 | Amperometric Sensor and Method for the Detection of Gaseous Analytes Comprising A Working Electrode Comprising Edge Plane Pyrolytic Graphite - An electrochemical sensor and method of detecting gaseous analytes are provided, which involve the use of a working electrode comprising edge plane pyrolytic graphite. | 06-17-2010 |
20100252451 | GAS MONITOR - Exposure of diffusion limited sensors to target gas concentrations above their range can result in non-linearity and slow recovery times. Applications where both a high concentration and a low concentration need to be measured in succession are problematic if the high concentration gas adversely affects the response of the sensor to low gas concentrations. By employing two sensors, one for high range and one for low range gas concentrations, and a means to isolate the low range sensor from the gas source whenever the concentration exceeds a threshold value as determined by the high range sensor and reengage the low range sensor when the target gas concentration falls below the threshold, allows both the measurement of target gas to high concentrations as well as the high resolution measurement of target gas at low concentrations. | 10-07-2010 |
20130043140 | Electrochemical Sensing Method - The present invention is related to a method for detecting at least one chemical analyte vapour in a gaseous environment comprising the steps of:
| 02-21-2013 |
20160169829 | METHOD AND APPARATUS FOR SENSING MOLECULAR GASES | 06-16-2016 |
205780000 | Using electrode containing precious metal or free carbon | 5 |
20110000797 | ELECTROCHEMICAL DEVICE AND METHOD FOR LONG-TERM MEASUREMENT OF HYPOHALITES - A method and apparatus measures the presence of total residual oxidant species in aqueous environments. More specifically, the apparatus is operable to measure hypohalites (e.g., hypochlorite and hypobromite) in water containing halide salts using electrochemistry. The apparatus can be a sensor having four electrodes—a reference electrode, a working electrode, and two auxiliary electrodes. The fourth electrode, i.e., the second auxiliary electrode, can be used to generate ionized water near and in contact with the working electrode. The ionized water can clean the working electrode to minimize effects due to scaling or biofilm formation. As such, the working electrode does not need the capability to clean itself. Thus, other elements, originally believed to be unsuitable for use in saline aqueous environments, can be used for the electrodes, for example, gold. | 01-06-2011 |
20120228157 | PROTECTION AND SURFACE MODIFICATION OF CARBON NANOSTRUCTURES - Nanostructures comprising carbon and metal catalyst that are formed on a substrate, such as a silicon substrate, are contacted with a composition that, among other useful modifications, protects the nano structures and renders them stable in the presence of oxidizing agents in an aqueous environment. The protected nano structures are rendered stable over an extended period of time and thereby remain useful during such period as components of an electrode, for example, for detecting electrochemical species such as free chlorine, total chlorine, or both in water. | 09-13-2012 |
20130008805 | METHOD FOR QUANTIFYING A CHEMICAL SUBSTANCE BY A SUBSTITUTIONAL STRIPPING VOLTAMMETRY TECHNIQUE - The purpose of the invention is to provide a method for accurately quantifying a chemical substance by a substitutional stripping voltammetry technique. A method is provided for quantifying a chemical substance contained in a sample solution, and the method comprises preparing a measurement system. The measurement system comprises a pair of working electrodes (a first and a second electrodes), a counter electrode, and a gel-coated electrode. This gel-coated electrode comprises an electrode surface, a stripping gel, and a protection gel, and the protection gel covers the stripping gel. | 01-10-2013 |
20130313128 | Electrochemical Sensor Apparatus and Electrochemical Sensing Method - An electrochemical sensor apparatus and electrochemical sensing method within an aqueous system are described, using one or more working electrodes of boron doped diamond (BDD). A cathodic reduction process provides a cathodic measurement and, substantially simultaneously, an anodic oxidation process provides an anodic measurement. A sum of a content of two equilibrium species within the aqueous system is obtained using both the cathodic measurement and the anodic measurement. One example measures total free chlorine by simultaneously measuring hypochlorous acid (HOCl) and hypochlorite ion (OCl | 11-28-2013 |
20150338367 | Ion-selective electrodes and reference electrodes with a solid contact having mesoporous carbon - The present description discloses solid-contact (SC) electrodes that use mesoporous carbon such as colloid-imprinted mesoporous (CIM) carbon as the interlayer. The electrodes can be ion-selective electrodes (ISEs) or reference electrodes. The CIM carbon with the interconnected mesopores is used as the intermediate layer between the solid electron conductor, such as gold, and a membrane such as an ionophore-doped ion-selective membrane or a reference membrane. The disclosure includes methods of constructing solid contact electrodes such as SC-ISE or reference electrodes with a CIM carbon interlayer, and methods of using the electrodes to determine the quantity of an analyte in a sample. The description also includes disposable paper-based devices for measuring analytes in a sample. | 11-26-2015 |