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Home > pH Meters and Water Quality Products > Electrodes, Laboratory

Electrodes, Laboratory

pH Electrode Basics
The Electrode Pair
Sensing half-cell electrodes are the measuring portion of the electrode system and contain the pH sensitive membrane. Reference half-cells electrodes provide the reference potential needed for pH
measurement. Most of the electrodes available at Cole-Parmer are combination electrodes that house both half-cells in a single probe.

Bulb Material And Design
The bulb or membrane is constructed of different types of glass, each with different
useful properties.

General-purpose glass: various pH ranges, temperatures to 212ºF (100ºC).

Blue glass: pH 0 to 14, temperatures to 230ºF (110ºC).

Amber glass: pH 0 to 14, temperatures to 230ºF (110ºC), prevents Na+ error in high Na+ concentration solutions.

The bulb shape can be modified to provide a semi-dome for increased ruggedness, a spear tip for penetration applications, or even a flat surface.

Glass vs Epoxy Body
Epoxy-body electrodes are impact resistant and are ideal for rough handling but should not be used at higher temperatures or for solvents.
Note: Even though the body of an epoxy electrode is plastic, the bulb will still be glass. Glass-body electrodes withstand high temperatures and highly corrosive materials or solvents.

Sealed vs Refillable
Sealed (also known as gel-filled) electrodes are easier to maintain than refillable liquid filled electrodes. However, they must be replaced when the fill material level is low. Refillable electrodes are long-lasting and provide a faster response.

Single- vs Double-junction
In combination electrodes, the reference junction allows H+ ions to pass freely between reference and sensing half-cells to complete the electrical circuit. A singlejunction design has one place where the H+ ions pass between half-cells. The junction is located so that contaminants in your sample can also pass into the reference chamber, leaving the potential for electrode failure due to reference contamination. A double-junction design restricts the reference behind a second junction; thus, it is twice as hard for reference contamination to occur.

Selecting The Right Electrode
Cole-Parmer offers a variety of laboratory electrodes for your general-purpose and specialty laboratory applications. The “Application Guide” below provides information to help you find the electrode that best fits your application. The guide only offers suggestions—call our Application Specialists for more specific
recommendations or clarification.

Application Guide
Biological samples, proteins, and tris buffer: Double-junction or ROSS®
Pharmaceuticals: Double-junction or ROSS
Hydrofluoric acid: Antimony or HF electrode
Low ionic strength samples and acid rain: AccuFlow™ or Sure-Flow® styles
Boiler feed water and distilled water: AccuFlow or Sure-Flow styles
Drinking water: Standard Ag/AgCl with single-junction
Wastewater: Double-junction or ROSS
Solutions with heavy metals: Double-junction
Soil samples: Soil electrode or double-junction
pH>9 and high Na+: Amber glass bulb, Ag/AgCl
High or rapidly changing temperatures: ROSS styles
Moist, flat surfaces: Flat-surface
Cheese, agar, paper, and skin: Flat-surface
Semisolid samples: Spear-tip, Ag/AgCl, ISFET
Fruits, cheese, and meat: Spear-tip, Ag/AgCl, ISFET
Nonaqueous samples, solvents, and alcohols: AccuFlow styles, Sure-Flow styles, or double-junction
Viscous samples, slurries, suspended solids, and sludges: AccuFlow styles, Sure-Flow styles, double junction, or ISFET
Emulsions and oils: AccuFlow styles, Sure-Flow styles, double-junction, or ISFET
Paints and inks: AccuFlow styles, Sure-Flow styles, double-junction, or ISFET

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Cole-Parmer
625 East Bunker Court Vernon Hills, IL 60061 USA
Phone: 1-800-323-4340 Fax: 1-847-247-2929 E-mail: sales@coleparmer.com

Electrodes, Laboratory

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