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pH Electrodes
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Leak-free, Combination, Micro, Flexible, Gastroesophageal, Buffers
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There were 16 questions found in this category:
 Can the single pH electrode in 25 gauge needle (part # 690491) be sterilized between uses?
Yes, the needle can be sterilized by immersing the tip of the electrode in Chlorox (or use ETO, Ethylene Oxide) and then rinse the tip of the electrode with sterile saline before use. The electrode can be stored dry after cleaning or in a pH 7 buffer.
- Do Leak-Free electrodes need to be filled?
Leak-Free electrodes never need to be filled.
- Do Leak-Free electrodes need to be regenerated periodically?
Leak-Free electrodes never need to be regenerated. In some cases the electrode can be polished by a fine sand paper and, if needed, stored or heated in acid.
- Does solution exchange take place through the junction of Leak-Free electrodes?
Leak-Free electrodes consist of a unique junction that is robust and highly conductive but not porous. Therefore solution exchange does not take place in either direction. However, the junction is so conductive that solutions need not physically travel from the sample to the electrode for detect ...
- Does the OXY-2 meter use a one point or two point calibration?
Two points. Common points include zero and air saturated (8 ppm at room temperature) in solution, and zero in nitrogen and 100% in pure oxygen gas.
- Does the single pH electrode in a 25 gauge needle (part # 690491) ever need regenerating?
Because the single pH electrode in a 25 gauge needle (order# 690491) is sealed, the filling solution cannot evaporate. Therefore, this electrode never needs to be, and cannot be, regenerated.
- How long should a Leak-Free electrode last under normal use conditions?
As long as the connector is not broken, Leak-Free electrodes should last 6-12 months or more.
- How should Leak-Free electrodes be stored?
Unlike conventional reference electrodes, there is no need to store Leak-Free electrodes in concentrated chloride solution. However, if the electrode was left dry for a very long period of time, it should be immersed in water for a few hours to recover. If you plan to use the electrode in soluti ...
- How well do Leak-Free electrodes tolerate acidic/basic solutions?
Leak-Free electrodes are not affected by hydrofluoric acid and common dilute acids and bases. On occasion we have boiled the electrodes in 1M sulfuric acid and have seen no damage. Acetic acid, however, is the exception and should be avoided if possible.
- How well do Leak-Free electrodes tolerate commonly used organic solvents?
Leak-Free electrodes are resistant to most commonly used organic solvents including acetonitrile, DMSO, THF, MEK, acetone, dichloromethane, esters, alcohol, and ketones.
- What are the advantages of using a Leak-Free electrode?
Leak-Free electrodes were developed to eliminate problems associated with the use of conventional porous-junction based reference electrodes. The problem solved include clogging, sample contamination, electrolyte loss, changing the ionic strength of the sample, and difficulties associated with u ...
- What is the difference between the Combination Gastroesophageal pH Electrode and the Flexible Combination pH Electrode for Free Flap Surgery?
These electrodes differ only in the length of their Flex tube. The Combination Gastroesophageal pH Electrode has a flex tube of 1 meter, while the Flexible Combination pH electrode for Free Flap Surgery has a flex tube of 3 inches long.
- What is the life expectancy of a micro-miniature pH electrode?
The standard life expectancy of any glass bulb pH sensor is approximately 1 year but will vary depending on handling and specific application.
- What is the potential of Ag/AgCl electrodes?
There is an excellent Wikipedia page on the subject of silver-silver chloride electrode potential at http://en.wikipedia.org/wiki/Silver_chloride_electrode. However, the standard potential for Ag/AgCl against a standard hydrogen electrode is 230mV ± 10mV.
- Will the Leak-free Ag/AgCl reference electrodes work in organic solvents?
Yes, solvents (e.g., propylene carbonate, ethylene carbonate, 1,2-dimethoxyethane, etc.) with water less than 1 ppm can be used.
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