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Topic: Ion-selective electrode

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Ion selective electrode - Wikipedia, the free encyclopedia Ion-selective electrodes are used in biochemical and biophysical research, where measurements of ionic concentration in an aqueous solution are required, usually on a real time basis. In use, the electrode wire is connected to one terminal of a galvanometer or pH meter, the other terminal of which is connected to a reference electrode, and both electrodes are immersed in the solution to be tested. The sensing part of the electrode is usually made as an ion-specific membrane, along with a reference electrode. en.wikipedia.org /wiki/Ion_selective_electrode   (1044 words)

Ion selective electrode apparatus and method of producing ion selective electrode apparatus - US Patent 6110338 The method of producing the ion selective electrode used for the electrode method is that the ion-sensing membrane is beforehand made by methods such as casting and then a fragment of the membrane is stuck on an electrode main part. An ion selective electrode of flowthrough type is used for electrochemical measurement of ion species contained in a biological fluid by the electrode method. The electrode method is a method of electrochemically detecting the reaction of an ion and a sensing substance using an ion-sensing membrane which confine the sensing material sensitive to an ion to be detected. www.patentstorm.us /patents/6110338.html   (2720 words)

Analysis by pH and Ion Selective Electrodes Ion selective electrodes are a technology that gives direct measurement of cations and anions such as sodium and fluoride, and can also measure dissolved gases such as ammonia and sulphur dioxide. For ion selective electrodes, calibration and measurement should be done at the same temperature, and ISA buffers added to both standards and samples. The most important feature of an ion selective electrode is the selective membrane that it is made off. delloyd.50megs.com /moreinfo/ISE.html   (2027 words)

CHEMICAL SENSORS RESEARCH GROUP The construction of this electrode is essentially identical to that of pH electrode, with the exception of the glass used (silica with 10% Na O and Al) and the fact that the inner reference solution has a fixed sodium ion activity. In the case of CO electrode the mechanism can be described by series of equilibrium: the partitioning of the gas molecules between the sample and the electrode (solubility equilibrium) and their hydrolysis inside the internal solution (e.g. Typical for all kinds of electrodes used in potentiometric ion measurements is a ion-sensitive membrane. csrg.ch.pw.edu.pl /tutorials/ise   (2247 words)

OMEGA ENGINEERING -Ion Selective Electrodes Typically, the ISE (Ion Selective Electrode) that is purchased will come with its own instruction manual that pertains to that particular type of electrode. (The pH electrode is an ISE for the Hydrogen ion.) This potential is measured against a stable reference electrode of constant potential. The activity coefficient is the ratio between the free ions and the total ionic concentration in the solution. www.omega.com /techref/ph-5.html   (701 words)

Phosphate ion selective electrode and manufacturing method thereof - US Patent 6540894 Another mode of this invention provides a phosphate ion selective electrode manufacturing method characterized in that the slightly soluble metal salt of aluminum phosphate is used as the main component, the powder of this aluminum phosphate is subject to hot press forming, and the solid membrane that is obtained is used as the sensing membrane. The phosphate ion selective electrode A of this invention is arranged as a so-called type 2 electrode and also enables detection of the aluminum ion concentration by use of the redox potential of aluminum metal. This invention concerns a phosphate ion selective electrode, which enables selective measurement of phosphate ion concentration, which is regarded as an important indicator of eutrophication in lakes, marshes, etc., and a method of manufacturing this phosphate ion selective electrode. www.patentstorm.us /patents/6540894.html   (1268 words)

Experimental procedure for ISE Ion selective electrodes are usually classified by the type of ion-sensitive membrane used in their construction, and by the ion for which they are selective. The response of an ion selective electrode, i.e., the potential developed, is a function of the ionic activity of a species in solution. Potentiometric titrations using ion selective electrodes permit the determination of either ions which can be sensed by the electrodes, or species which react with these ions to form other ions, complexes, or precipitates. www.chemistry.adelaide.edu.au /external/soc-rel/content/expts/iseexpt.htm   (1799 words)

CHLORIDE ION SELECTIVE ELECTRODE The operation of the chloride ion selective electrode (ISE) to be used in this experiment is based on the response of a disc of sensing element, which is sealed into one end of an epoxy tube (Bailey 1980). The operation of the chloride ion selective electrode (ISE) to be used in this experiment is based on the response of a disc of sensing element, which is sealed into one end of an epoxy tube (Baily 1980). An external reference electrode is also connected in series with the chloride ISE, and may be incorporated into the ISE with a salt bridge connecting the ISE and reference electrodes.This arrangement, where the ISE and external reference electrodes are housed in a single electrode body is refered to as a combination electrode. delloyd.50megs.com /labscripts/chloride.html   (2557 words)

Disposable cartridge for ion selective electrode sensors - Patent 5284568 The disadvantages of the ion selective electrode containing devices described in the foregoing prior art are substantially overcome by the disposable cartridge of the present invention. A readily disposable ion selective electrode assembly, free of onboard reagents, for use in analyzers has a reference element and plural sensor elements linearly positioned in parallel on a substrate. For this purpose, ion selective electrodes (ISE) have routinely been applied in the clinical measurement of sodium, potassium, chloride and similar ions. www.freepatentsonline.com /5284568.html   (3900 words)

Electrochemistry C In case of an electrode reaction, the electrode itself is considered one of the "reactants." An electrode reaction is always a heterogeneous charge-transfer reaction. The overpotential of the two electrode reactions will be generally different, and their values will be dictated by the requirement that the electrode potentials be equal (at the "corrosion potential") at one, uniquely defined current (the corrosion current). Current that is bypassing bipolar electrodes in a series coupled cell assembly (due to insufficient sealing or improper piping around the bipolar electrode) and therefore is not producing the required chemical change (electrode reaction). www.corrosion-doctors.org /Dictionary/Dictionary-C.htm   (3909 words)

Ion-selective electrodes (from analysis) --  Encyclopædia Britannica The potential between the indicator electrode and the reference electrode varies as the concentration or activity of that particular species varies. Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond... The electrode from which electrons emerge is called the cathode and is designated as negative; the electrode that receives... www.britannica.com /eb/article-80819   (853 words)

Ion-selective electrode - Patent 4312734 The standard glass electrode includes a hollow bulb constructed of special ion selective glass, which serves as a membrane for charge transfer in response to the concentration of hydrogen ions in the medium to be measured. The electrode comprises a metal conductor constituted of platinum, gold, or tantalum, a layer comprising an oxide of the metal having a thickness of between about 50 Angstrom units and about 2 microns on an outer surface of the metal conductor, and an ion-selective glass membrane over and in electrical contact with the oxide layer. The pH electrode is one whose potential varies as a function of the hydrogen ion concentration of the aqueous medium, generally in accordance with the classical Nernst equation. www.freepatentsonline.com /4312734.html   (5274 words)

fluoride_ion.doc.htm Inversion of the electrode makes it possible for the membrane to be used as a sample container itself and hence permitting measurements as small as one drop. Coupled with a reference electrode (typically the calomel electrode), F-ISE measures the response of the fluoride ions as a potential difference between itself and the reference electrode. With this electrode, a decrease in activity is observed in 2 situations i.e. www-users.york.ac.uk /~srms500/siti.org.uk/generated/fluoride_ion.doc.htm   (1304 words)

CHP - Ion-Selective Electrodes An Ion-Selective Electrode (ISE) produces a potential that is related to the concentration of an analyte. ISEs consist of the ion-selective membrane, an internal reference electrode, an external reference electrode, and a voltmeter. ISEs for other ions must have an appropriate membrane that is sensitive to the ion of interest but not sensitive to interfering ions. www.chem.vt.edu /chem-ed/echem/ise.html   (259 words)

Construction and Use of an Ion Selective Electrode One of the major shortcomings of some ion selective electrodes is that they do not show enough selectivity to the ion of interest relative to other compounds of similar structure. Prepare the ion selective membrane by dissolving 0.07g PVC and 0.15g of the tetraalkylammonium salicylate salt in 2.0mL of THF. Measure the selectivity of the ISE relative to 0.10M benzoate ion at a concentration of 10 course1.winona.edu /jfranz/Lab/ise.htm   (653 words)

CH232 Lab Experiment #3 - Determination of Calcium Using an Ion Selective Electrode As with any ion selective electrode the manufacturers specification sheets should be consulted to ensure that the electrode is prepared and used in accordance with its design. When the electrode is in a solution containing calcium ions an electrode potential develops across the membrane which is dependent on the activity of free calcium in solution. After storage the electrode should be soaked in water 15 minutes and in calcium standard for at least one hour then the electrode operation checked to insure proper operation and response. chemistry.lssu.edu /CH332/lab3A.htm   (899 words)

USGS Bulletin 1823 - Determination of Fluoride in Coal by Ion-Selective Electrode The fluoride concentration then is determined by measurement of the potential produced by a fluoride ion-selective electrode. Upon completion of all measurements of electrode potentials for samples and calibration standards, graphically establish the functional relation between fluoride concentration and electrode potential by plotting concentration (in micrograms per milliliter) versus measured potential (in millivolts). Place the electrodes in the sample solution, and after exactly 10 min of equilibration, measure the potential produced by the fluoride-ion electrode. pubs.usgs.gov /bul/b1823/09.htm   (1447 words)

Coordination Chemistry and Fluoride a Analysis By Ion-Selective Electrode The fluoride ion-selective electrode is constructed very similarly to the pH glass electrode. The Fluoride electrode cannot detect these species since it responds only to free fluoride ions. Fluoride electrode can be used to measure Total Fluoride and its ionic forms in water samples. www.slcc.edu /schools/hum_sci/chemistry/faculty/iles/CHEM1220/unit8.htm   (332 words)

pH electrodes, Ion-selective electrodes (ISE), ORP electrodes, pH meters Welcome to Weiss Research - your high quality, inexpensive laboratory and industrial processing pH, ORP (Redox), Ion-Selective electrode (ISE) Headquarters. The electrodes with a solution grounding are most suitable for the application which requires use a long cable and a possible ground loop interference. These electrodes, both pH and ORP (redox), are always sealed with ElectroJelly™ (unless customers have special requirements) to extend the electrode life span and reduce the calibration frequency. www.weissresearch.com   (317 words)

ELIT Iodide ISE - Iodide Ion Selective Electrode The Iodide Ion-Selective Electrode has a solid-state Crystal membrane. Ion-Selective Electrode for iodide ion (ELIT 8281 crystal membrane) Briefly, it is important to note that, if measuring in beakers, the electrodes must be washed and dried between each sample, to avoid cross contamination, and sufficient time must be allowed (2 or 3 minutes), before taking a reading after immersion, to permit the electrode signal to reach a stable value. www.nico2000.net /analytical/Qiodide.htm   (692 words)

Fluoride Electrode Measurements Sources of error include fluoride ion activity changes due to the ionic strength of solution, temperature, which can effect the measured potential through the Nernst equation which governs the electrode potential response and through the several equilibria that fluoride may have with species present in solution, and substances that complex fluoride in solution. The degree of interference depends on the concentration of the complexing ion and that of the fluoride. Assuming that a saturated calomel electrode is used as the external reference, the potentiometric cell may be represented as www.chem.usu.edu /~sbialkow/Classes/565/fluoride.html   (1025 words)

ISE_Book_Corrections.htm The available chloride ion selective electrode is a combination electrode which incorporates the ISE and the reference in a single device. The available nitrate ion selective electrode is NOT a combination electrode. For the nitrate ion selective electrode a 2M (NH solution is recommended. www.chem.arizona.edu /courseweb/981/CHEM104b1/ISE_Book_Corrections.htm   (297 words)

Stordal Determination of calcium ion in oil-based drilling fluids by use of an ion-selective electrode (Working papers from Roga... nynorsk.encyclopedia.st /Stordal   (206 words)

Ion Selective Electrode FAQ sulfate with a lead electrode), use a stock standard of the ion to be measured (e.g. Also, if an electrode is being used to measure another ion (e.g. There is more than one advantage: no external reference electrode needed, more economical than the price of both, and one less electrode to fit in the process. www.phoenixelectrode.com /faq_ise.php   (340 words)

ELIT Ion selective electrode vs the Combination electrode In the laboratory, the user would generally purchase one reference electrode which could be used with several different Ion Selective Electrodes. The construction of combination electrodes entails that several different substances be combined to produce the electrode. The reference electrode in any form, either gel or liquid, must be stored wet, whereas the ISE must be stored dry. lavallab.com /ion-selective-electrode/ion-selective-electrode-elit.htm   (404 words)

Kwik-Tip Electrode tips normally last several months, when stored properly in saline solution. These highly stable electrodes accurately measure calcium, potassium, and chloride ion activity. Kwik-Tip electrodes are available separately and as kits -- Each "KWIK" Electrode Holder kit includes a reusable holder and three removable tips. www.wpiinc.com /WPI_Web/Biosensing/Kwik-Tip.html   (178 words)

ELIT Barium ISE - Barium Ion Selective Electrode Before use, the electrodes must be calibrated to find an accurate value for the slope under the current operating conditions and in the range of the expected sample concentrations. The electrode is designed for the detection of barium ions (Ba in aqueous solutions and is suitable for use in both field and laboratory applications. Because the barium electrode is interfered with by several ions which are constituents of the most commonly used ISABs, and in view of the occasional negative interference in some natural waters, barium is best analysed using the Standard Addition method rather than direct potentiometry. www.nico2000.net /analytical/Qbarium.htm   (637 words)

The Fluoride Ion Selective Electrode Experiment For an ion selective electrode with slope S that responds only to the analyte ion with concentration C, Now, if we wish to remove any effect that ties up part of the analyte ion, we need to divide the response with standard addition by the response without standard addition. The final equation is in the form of y = mx + b, where y is the electrode response to the amount x of standard added. Use these solutions to determine if your electrode is operating properly by plotting E vs. log C and checking for Nernstian behavior. zimmer.csufresno.edu /~davidz/Chem102/FluorideISE/FluorideISE.html   (1414 words)

Calcium Ion Selective Electrode Simulation The change in activity coefficient gives rise to an error in the determination, because the electrode potential responds to activity, not concentration. Type in values for the sample concentration Cx, sample volume Vx, standard concentration Cs, standard volume added Vs, concentration of ionic strength buffer Cse, ion charge n, Nernst factor (usually 0.0591) and potential of reference electrode Eo, into the table on the left. Note that adding standard solution to the sample causes a slight increase in its ionic strength and thus a slight difference in the activity coefficient of calcium. www.inform.umd.edu /EdRes/Topic/Chemistry/ChemConference/Software/Spreadsheets/WWW/CaElectrode.html   (1065 words)

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