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  • Ion Selective Electrodes (ISE)
Ion Selective Electrodes (ISE)

An ion-selective electrode (ISE), also known as a specific ion electrode (SIE), is a transducer (or sensor) that converts the activity of a specific ion dissolved in a solution into an electrical potential. The voltage is theoretically dependent on the logarithm of the ionic activity, according to the Nernst equation. Ion-selective electrodes are used in analytical chemistry and biochemical/biophysical research, where measurements of ionic concentration in an aqueous solution are required.

Glass membranes

Glass membranes are made from an ion-exchange type of glass (silicate or chalcogenide). This type of ISE has good selectivity, but only for several single-charged cations; mainly H+, Na+, and Ag+. Chalcogenide glass also has selectivity for double-charged metal ions, such as Pb2+, and Cd2+. The glass membrane has excellent chemical durability and can work in very aggressive media. A very common example of this type of electrode is the pH glass electrode.

Crystalline membranes

Crystalline membranes are made from mono- or polycrystallites of a single substance. They have good selectivity, because only ions which can introduce themselves into the crystal structure can interfere with the electrode response. This is the major difference between this type of electrodes and the glass membrane electrodes. The lack of internal solution reduces the potential junctions. Selectivity of crystalline membranes can be for both cation and anion of the membrane-forming substance. An example is the fluoride selective electrode based on LaF3 crystals.

Ion-exchange resin membranes

Ion-exchange resins are based on special organic polymer membranes which contain a specific ion-exchange substance (resin). This is the most widespread type of ion-specific electrode. Usage of specific resins allows preparation of selective electrodes for tens of different ions, both single-atom or multi-atom. They are also the most widespread electrodes with anionic selectivity. However, such electrodes have low chemical and physical durability as well as "survival time". An example is the potassium selective electrode, based on valinomycin as an ion-exchange agent.

Enzyme electrodes

Enzyme electrodes definitely are not true ion-selective electrodes but usually are considered within the ion-specific electrode topic. Such an electrode has a "double reaction" mechanism - an enzyme reacts with a specific substance, and the product of this reaction (usually H+ or OH−) is detected by a true ion-selective electrode, such as a pH-selective electrodes. All these reactions occur inside a special membrane which covers the true ion-selective electrode, which is why enzyme electrodes sometimes are considered as ion-selective. An example is glucose selective electrodes.

Alkali metal ISE

Electrodes specific for each alkali metal ion, Li+, Na+, K+, Rb+ and Cs+ have been developed.The principle on which these electrodes are based is that the alkali metal ion is encapsulated in a molecular cavity whose size is matched to the size of the ion. For example, an electrode based on Valinomycin may be used for the determination of potassium ion concentration.

Ion Selective Electrodes (ISE)

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HACH 2348100 sensION Sodium Ion Selective Electrode (ISE) Analysis Package
HACH 2348100 sensION Sodium Ion Selective Electrode (ISE) Analysis Package
Hach sodium ISE analysis package contains a reliable electrode designed for general purpose sodium...
Rp.20,500,000
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HACH 2348700 Ammonia Ion Selective Electrode (ISE) Analysis Package
HACH 2348700 Ammonia Ion Selective Electrode (ISE) Analysis Package
The Hach Ammonia ISE Analysis Package includes the Hach Ammonia Electrode which measures ammonia g...
Rp.20,500,000
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HACH 5192500 sensION Sodium Platinum Series Combination Ion Selective Electrode (ISE)
HACH 5192500 sensION Sodium Platinum Series Combination Ion Selective Electrode (ISE)
The Hach Sodium Platinum Series Combination Electrode is a reliable electrode designed for general...
Rp.18,500,000
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HACH 5192700 Ammonia Ion Selective Electrode (ISE), BNC Connector
HACH 5192700 Ammonia Ion Selective Electrode (ISE), BNC Connector
The Hach Ammonia Combination Electrode measures ammonia gas or ammonium ions in aqueous solutions th...
Rp.18,750,000
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HACH 5192800 sensION Fluoride Ion Selective Electrode (ISE), BNC Connector
HACH 5192800 sensION Fluoride Ion Selective Electrode (ISE), BNC Connector
The Hach Fluoride Combination Electrode measures free fluoride ions in aqueous solutions using a s...
Rp.21,800,000
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HACH LZW5044.97.0002 sensION+ 5044 Reference Electrode
HACH LZW5044.97.0002 sensION+ 5044 Reference Electrode
The Hach sensION+ 5044 Reference Electrode is a double junction reference electrode with...
Rp.10,450,000
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HACH LZW9650.97.0002 sensION+ 9650 Sodium Ion Selective Electrode (ISE)
HACH LZW9650.97.0002 sensION+ 9650 Sodium Ion Selective Electrode (ISE)
The Hach sensION+ 9650 sodium ion selective electrode is a half-cell (reference not integrated) so...
Rp.13,800,000
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HACH LZW9652.97.0002 sensION+ 9652 Chloride Ion Selective Electrode (ISE)
HACH LZW9652.97.0002 sensION+ 9652 Chloride Ion Selective Electrode (ISE)
The Hach sensION+ 9652 chloride ion selective electrode is a half-cell (reference not in...
Rp.16,700,000
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HACH LZW9655.97.0002 sensION+ 9655 Fluoride Ion Selective Electrode (ISE)
HACH LZW9655.97.0002 sensION+ 9655 Fluoride Ion Selective Electrode (ISE)
The Hach sensION+ 9655 fluoride ion selective electrode is a half-cell (reference not in...
Rp.16,700,000
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HACH LZW9662.97.0002 sensION+ 9662 Nitrate Ion Selective Electrode (ISE)
HACH LZW9662.97.0002 sensION+ 9662 Nitrate Ion Selective Electrode (ISE)
The Hach sensION+ 9662 nitrate ion selective electrode is a half-cell (reference not integrated) n...
Rp.16,700,000
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HACH LZW9663.97.0002 sensION+ 9663 Ammonium Ion Selective Electrode (ISE)
HACH LZW9663.97.0002 sensION+ 9663 Ammonium Ion Selective Electrode (ISE)
The Hach sensION+ 9663 ammonium ion selective electrode is a half-cell (reference not integrated) ...
Rp.16,700,000
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Thermo Fisher 9409BN Orion™ Fluoride Electrodes
Thermo Fisher 9409BN Orion™ Fluoride Electrodes
Measure free fluoride ions in aqueous solutions quickly, simply, accurately and economically with ...
Rp.18,150,000
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Thermo Fisher 9417BN Orion™ Chloride Electrodes
Thermo Fisher 9417BN Orion™ Chloride Electrodes
Orion chloride solid state half-cell electrode, BNC connector, 1m cable (requires 900200 reference e...
Rp.17,500,000
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Thermo Fisher 9502BNWP Orion™ Carbon Dioxide Electrode
Thermo Fisher 9502BNWP Orion™ Carbon Dioxide Electrode
Measure carbon dioxide, carbonate and bicarbonate in aqueous solutions quickly and accurately with...
Rp.20,600,000
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Thermo Fisher 9512HPBNWP Orion™ High-Performance Ammonia Electrode
Thermo Fisher 9512HPBNWP Orion™ High-Performance Ammonia Electrode
Obtain a more linear response at lower levels and improved response time in ammonia measurements w...
Rp.18,500,000
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Thermo Fisher 9609BNWP Orion™ Fluoride Electrodes
Thermo Fisher 9609BNWP Orion™ Fluoride Electrodes
Measure free fluoride ions in aqueous solutions quickly, simply, accurately and economically with ...
Rp.20,500,000
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Thermo Fisher 9719BNWP Orion™ Potassium Electrodes
Thermo Fisher 9719BNWP Orion™ Potassium Electrodes
The Thermo Orion ionplus Potassium Electrode measures potassium in aqueous solutions simply, accurat...
Rp.23,500,000
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YSI 006882 (6882) Chloride ISE Sensor
YSI 006882 (6882) Chloride ISE Sensor
The YSI 6882 chloride ISE sensor employs a solid state membrane attached to a co...
Rp.0
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YSI 006883 (6883) Ammonium ISE Sensor
YSI 006883 (6883) Ammonium ISE Sensor
The YSI 6883 ammonium ISE sensor employs a silver/silver chloride (Ag/AgCl) wire electrode in a cu...
Rp.0
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YSI 006884 (6884) Nitrate ISE Sensor
YSI 006884 (6884) Nitrate ISE Sensor
The YSI 6884 nitrate ISE sensor consists of a silver/silver chloride wire electrode in a custom fi...
Rp.0
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Categories
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