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Topic: Reference electrode

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	Polarographic chemical sensor with external reference electrode - Patent 5078854
		By the use of the present invention, electrode assemblies may be fabricated having the reference electrodes separated from the measuring electrodes by a selectively permeable, hydrophobic membrane having reasonably high electrical conductivity and manifesting a stable electrochemical potential thereacross in analyte fluids having various ionic compositions therein.
		The reference electrode 20 is also supported in the lower portion 13a of the insulating body and is disposed such that at least a portion thereof is in electrical communication with the fluid in the fluid flow channel 10.
		Electrodes structured in accord with the principles of the present invention may be fabricated to sense a variety of substances and may further include enzymes or other reactive materials to allow measurement of species not directly active electrochemically.
	www.freepatentsonline.com /5078854.html (6659 words)

	BAS FAQ: EC Electrodes
		Better potential control is achieved using a potentiostat and a 3-electrode system, in which the potential of one electrode (the working electrode) is controlled relative to the reference electrode, and the current passes between the working electrode and the third electrode (the auxiliary electrode).
		Decreasing the size of the electrode to micron dimensions (microelectrodes) decreases the iR drop at the electrode, decreases the electrode capacitance (which allows a faster scan rate to be used for cyclic voltammetry), and changes the diffusion to the electrode surface from linear to radial.
		Since the potential of a chloride-containing reference electrode is sensitive to chloride concentration, the electrode must be stored with the frit immersed in a solution identical in composition and concentration to the reference electrode solution (e.g., 3 M sodium chloride for the BASi silver/silver chloride reference electrode).
	www.bioanalytical.com /products/ec/faqele.html (2673 words)

	OMEGA ENGINEERING - Electrode Basics
		In summary, the measuring electrode delivers a varying voltage and the reference electrode delivers a constant voltage to the meter.
		Electrodes are designed to measure mostly aqueous media.
		Electrode demise can usually be characterized by a sluggish response, erratic readings or a reading which will not change.
	www.omega.com /techref/ph-3.html (832 words)

	Potentiostat stability and your Reference Electrode
		The impedance of a standard laboratory reference electrode is usually determined by the resistance of its isolation junction.
		A double junction reference electrode is used to minimize filling solution contamination of the test electrolyte.
		Reference electrode potentials are typically only reproducible to about one millivolt, so a one microvolt error is inconsequential.
	www.gamry.com /App_Notes/ReferenceElectrodes/ReferenceElectrodes.htm (1494 words)

	Reference electrode for electrochemical determination of oxygen partial pressure in an ionic melt - Patent 5580439
		Either the calibration curve is obtained experimentally by immersing a Zirconium dioxide electrode in the glass melt and measuring a potential difference between the metal/metal oxide reference electrode and the Zirconium dioxide electrode at a plurality of temperatures or theoretically from thermodynamic data for the metal/metal oxide reference electrode.
		According to the invention the reference electrode is a metal/metal oxide electrode.
		The metal/metal oxide electrode 7 is a Mo, Ta or W rod of a diameter of about 4 mm and length of 400 mm whose portion which is not immersed in the glass melt is advantageously protected under an inert gas atmosphere, e.g.
	www.freepatentsonline.com /5580439.html (5235 words)

	The Reference Electode in Electrochemical Detection for HPLC \| ESA Biosciences, Inc.
		The potential applied to the working electrode is measured within the context of a known potential, which is in turn obtained from the reference electrode.
		A similar reference electrode to the wet silver/silver chloride electrode is the mercury/mercurous chloride or calomel electrode.
		This reference electrode is used in all ESA analytical sensors including the flow-through porous graphite coulometric sensors as well as the thin-layer amperometric sensors.
	www.esainc.com /theory/coulometric/esaelectrode.html (1522 words)

	REFERENCE ELECTRODES
		Each reference electrode is individually inspected and tested for adherence to an acceptable range relative to a standard calomel electrode.
		A reference electrode may be considered a small battery whose voltage (potential) is determined by the chemistry taking place between a solid conductor (usually a metal salt) and the electrolytic solution around it.
		The reference electrode potential is determined by the quantity of Cl in the mobile phase.
	www.epsilon-web.net /Lc/manuals/Maintenance/Reference/reference.html (1042 words)

	Reference Electrodes
		For instance, a reference electrode with a ceramic wick saturated with KCl, is not applicable to the measurement of chloride and potassium ions since it will interfere with the measurement by releasing KCl from the ceramic wick into the sample.
		Another advantage is that when the reference junction was clogged by the dirty sample or other materials, no problem at all, just simply replace it with a new ceramic junction.
		These reference electrodes are constructed by rugged and high chemical resistance epoxy body and with refillable Ag/AgCl reference cell with double or single junction.
	www.weissresearch.com /Reference.htm (375 words)

	ACM: Electrochemical Cell Kit & Accessories
		Typical reasons for this are: pollution caused by Reference Electrode extreme heat in the test cell and the desire to reduce solution resistance by placing the Luggin probe as close as possible to the test electrode.
		Air leaks around the remote reference electrode are a typical problem causing a gradual dropping of the fluid level and eventual draining of the salt bridge.
		Indeed the typical result of the reference Electrode becoming isolated from the cell is that the test electrode is effectively dissolved by excessive polarisation.
	www.acminstruments.com /cellkit-tech.shtml (916 words)

	Silver chloride electrode (Site not responding. Last check: 2007-11-04)
		The electrode is a silver wire that is coated with a thin layer of silver chloride either by electroplating or by dipping the wire in molten silver chloride.
		The silver-silver chloride reference electrode develops a potential proportional to the chloride concentration, whether it is sodium chloride, potassium chloride, ammonium chloride or some other chloride salt.
		The silver-silver chloride electrode simplicity of fabrication and fundamental ruggedness makes it a good candidate for many industrial applications where the electrochemical potential has to been measured or controlled.
	www.corrosion-doctors.org /References/silver.htm (406 words)

	Experimental Unit A
		The potential of the standard reference electrode is constant and ideally does not change during the measurement.
		The reference electrode ideally: (i) should obey the Nernst equation, (ii) should maintain a constant potential during and after use, and (iii) should not display hysteresis when subjected to changes in temperature.
		Electrode manufacturers recommend that a new or cleaned electrode be soaked in water, or buffer followed by water, for up to several days to establish the gel layer.
	www.msu.edu /~bchug/bch471/471cpeua.htm (3303 words)

	FAQ (Site not responding. Last check: 2007-11-04)
		The purpose of the reference electrode is to maintain a constant reference potential regardless of change in pH or other ionic activity in the solution.
		An important component of a reference electrode is the liquid junction.
		The purpose of a liquid junction is to maintain electrical contact between the pH measuring electrode and the reference electrode.
	www.innovativesensors.com /FAQ.htm (1203 words)

	Silver ref
		The electrodes are usually made of metal, where current is carried by movement of electrons, the electrolyte solution consists of ions in a polar solvent, typically water.
		The reference selected was the normal hydrogen electrode which consists of a platinum electrode in a solution of 1M HCl over which hydrogen gas at one atmosphere is bubbled.
		A reference electrode has to be designed so that there is a well defined potential difference between the metal electrode and the solution in contact with it.
	www.tannerm.com /ag_ref.htm (2006 words)

	Electrodes and Accessories by MCM - MC Miller Co. (Site not responding. Last check: 2007-11-04)
		Used in conjunction with a Copper / Copper Sulfate reference electrode and voltmeter to measure the pH of soil.
		The tube assembly of the electrode is etched with the conversion table of millivolts to pH.
		The brilliant orange color of the Lexan tube was selected to provide an electrode which can be readily seen in grass, and to help locate it when it is placed remote or when it breaks loose from the "pull-in" lead.
	www.farwestcorrosion.com /fwst/refelect/mcm01.htm (885 words)

	F Series - reference electrodes for tanks and vessels
		Reference electrodes designed for through wall installation in heat exchangers, condensers, tanks and vessels comprise our F Series.
		Reference electrodes designed for mounting directly on a heat exchanger or condenser tube sheet are found in our T Series.
		For intermittent readings, the reference electrode is simply pressed into the bridge; this allows a single reference electrode to be used with several bridges.
	www.edi-cp.com /bdf.htm (512 words)

	Practical pH Control : Support - Technical Articles :: Sensorex (Site not responding. Last check: 2007-11-04)
		Reference side contamination as a result of interactions between the silver ions in the electrodes and materials in the solution which interact with silver.
		The flat design utilizes a large surface area porous reference junction which has thousands of paths for reference diffusion and the possibility of all of these paths becoming plugged is quite remote.
		If the electrode is too far away from the addition site, it may be late in sensing the change and over-adjustment and chemical waste can occur.
	www.sensorex.com /support/technical_articles/practical_pH_control.html (1160 words)

	2
		While in use, the bulb of the glass electrode and the diaphragm of the reference electrode should be immersed in solution.
		It is simpler, however, to prevent the coating of the electrodes by addition of a surfactant as polyvinyl alcohol (1 drop 0.3% PVA to every 5 ml of solution).
		A good example is the use of gold electrodes in the titration of ascorbic acid with bromine in continuous mode, where the response of the platinum electrode is unsatisfactory.
	www.tau.ac.il /~advanal/PotentiometricTitrations.htm (1952 words)

	Section 6.5.2
		The Eh measurements are made by inserting a platinum electrode coupled with a reference electrode into the solution to be measured.
		E° = 430 mV is the standard electrode potential of ZoBell's solution measured against the hydrogen electrode at 25°C. Half-cell potentials for the calomel, silver:silver chloride, and combination electrodes are shown in table 6.5-2.
		Refer to section 6.5.4 if the value is not within 5 mV of the ZoBell Eh.
	water.usgs.gov /owq/FieldManual/Chapter6/6.5.2.html (714 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.
		Most ISE's are combination electrodes that have the reference electrode built into the body of the ISE, however, some ISE's require a separate reference electrode.
	www.omega.com /techref/ph-5.html (701 words)

	Gamry Instruments, Inc. (Tech Tip) Potentiostat primer
		The Working Electrode is the electrode where the potential is controlled and where the current is measured.
		The reference electrode is used in measuring the working electrode potential.
		The collection of the electrodes, the solution, and the container holding the solution are referred to as an electrochemical cell.
	www.gamry.com /App_Notes/Potentiostat_Primer.htm (1175 words)

	PNNL: Available Technologies: Reference Electrode with Exceptional Long-Term Stability
		This technology is a reference half-cell electrode in which the intermingling of the test fluid with the reference fluid does not affect the performance of the reference cell over long time periods.
		This reference half-cell may be used as a single or double junction submersible or surface reference electrode.
		The intermingling reference half-cell relies on a capillary tube having one end open to the reference fluid and a second end open to the test fluid.
	availabletechnologies.pnl.gov /technology.asp?id=48 (139 words)

	InterCorr International
		It includes a separate pressurized reference cell that can be maintained at the same pressure as the test environment but remains at ambient temperature.
		The pressure in the reference cell is increased and matched to that in the test vessel using a micrometering pump.
		This minimizes backstreaming of corrosive constituents in the test environment into the reference cell thereby increasing the usable life of the reference electrode.
	www.intercorr.com /refelectrode.htm (368 words)

	CHEM 3325 - EXPERIMENT 1-2 - Reference Electrode Introduction (Site not responding. Last check: 2007-11-04)
		The performance of a saturated calomel reference electrode is determined using accepted procedures.
		A reference electrode is used in conjunction with a sensing or indicator electrode to complete the electrical measuring circuit.
		In most electrochemical work, it is not necessary to know the actual value of the reference electrode potential - as long as it is constant.
	nobel.scas.bcit.ca /chem3325/expt1-2/1-2_intro_refElectrode.htm (563 words)

	Glass electrode - Wikipedia, the free encyclopedia
		Glass electrode is a potentiometric sensor made from glass of a specific composition.
		The reference end is essentially the inner tube of the pH meter, which for obvious reasons cannot lose ions to the surrounding environment (as a reference is good only so long as it stays static through the duration of the measurement).
		The measuring part of the electrode, the glass bulb on the bottom, is coated both inside and out with a ~10nm layer of a hydrated gel.
	en.wikipedia.org /wiki/Glass_electrode (1095 words)

	Reference electrode - Wikipedia, the free encyclopedia
		Reference electrode is an electrode which has a stable and well-known electrode potential.
		Reference electrodes are used to measure electrochemical potential.
		Common reference electrodes and potential with respect to the standard hydrogen electrode:
	en.wikipedia.org /wiki/Reference_electrode (103 words)

	Reference electrode (Site not responding. Last check: 2007-11-04)
		A reference electrode is used in measuring the working electrode potential of an electrochemical cell.
		The most common laboratory reference electrodes are the Saturated Calomel Electrode (SCE) and the Silver/Silver Chloride (Ag/AgCl) electrodes.
		A Luggin capillary is often used to position the sensing point of a reference electrode to a desired point in a cell.
	corrosion-doctors.org /References/Introduction.htm (86 words)

	BAS Reference Electrodes
		The 7.5 cm long RE-5B reference electrode is used for voltammetry and polarography experiments using the C-2 and C-3 Cell Stands, the CGME Controlled Growth Mercury Electrode, the RDE-1 and RDE-2 Rotating Disk Electrodes, and the LCM Low Current Module.
		The shorter (3 cm) RE-6 reference electrode is used with the CC-5 Cross-Flow Thin-Layer Flow Cell.
		Both electrodes have a 6 mm OD glass body, and use a porous junction (frit) made from either ceramic (RE-6) or Vycor (RE-5B).
	www.bioanalytical.com /products/ec/ref.html (534 words)

	Fluoride Electrode Measurements
		An external reference electrode must be used to perform the measurement.
		Assuming that a saturated calomel electrode is used as the external reference, the potentiometric cell may be represented as
		Be sure to rinse the electrodes off with distilled water and dry with a tissue between readings.
	www.chem.usu.edu /~sbialkow/Classes/565/fluoride.html (1025 words)

	an introduction to redox equilibria and electrode potentials
		The emf measured when a metal / metal ion electrode is coupled to a hydrogen electrode under standard conditions is known as the standard electrode potential of that metal / metal ion combination.
		By convention, the hydrogen electrode is always written as the left-hand electrode of the cell.
		Remember that the standard electrode potential of a metal / metal ion combination is the emf measured when that metal / metal ion electrode is coupled to a hydrogen electrode under standard conditions.
	www.chemguide.co.uk /physical/redoxeqia/introduction.html (2410 words)

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