Redox StandardsRedox Standards

During its working life a Redox electrode undergoes no change of zero point or slope. Redox is an absolute measurement expressed in millivolts (unlike pH, which is an artificial logarithmic scale using values of 1 - 14). Therefore, redox electrodes do not require calibration and the standards act as control materials rather than calibration standards. Such control standards not only control the functionality of the sensing and reference electrode, but also control the analyst's technique, environmental conditions and the operation of the measurement meter (pH meter in millivolt mode). If the measurement of the control material is outside the expected values, it may be due to any or several of the following reasons:
• Poor connections or a short circuit within the electrodes or between the electrodes and meter.
• Incompatibility between the reference electrode and sample, in particular the use of incorrect electrolyte.
• Contamination or poisoning of reference system or reference electrolyte.
• Blocked or contaminated diaphragm.
• Incorrect choice of sensing electrode.
In choosing an electrode, broadly, but not exclusively the analyst can chose between platinum or gold and chose several different options as to how the platinum or gold is configured on the electrode. Although, platinum is more commonly used, it may give erroneous results in low ionic strength solutions or, when its surface
is passivated or roughened. It may also show poor results in strongly oxidizing solutions. On the other hand gold is totally unsuitable in the presence of or due to the formation of gold cyanide or gold halide complexes in the sample. Although substantial guidance is offered in the literature on which metal to use, the specific experience of the user, is the most important determinant of the final choice.

• Widest range of values and pack options available in the market
• Extensive technical advice on the measurement techniques available
• Enquiries for customized or bulk options welcome
• All products certified with proven verifiable accuracy and uncertainty of measurement
• Very high specifications (±5mV)

Product Listings for Redox Standards

CodeItemUnit
R-RS1245
Redox Standard 124mV @ 25° C
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5L
R-RS124
Redox Standard 124mV @25° C
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500ml
R-RS12410
Redox Standard 124mV @25° C
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10L
R-RSB12410
Redox Standard 124mV @25°C (Bag in Box Format)
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10L
R-RS20025
Redox Standard 200mV @ 25°C
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250ml
R-RS200
Redox Standard 200mV @25° C
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500ml
R-RS20010
Redox Standard 200mV @25° C
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10L
R-RS2205
Redox Standard 220mV @ 25°C
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5L
R-RS220
Redox Standard 220mV @25° C
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500ml
R-RS22025TT
Redox Standard 220mV @25° C Twin Neck
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250ml
R-RSB22010
Redox Standard 220mV @25°C (Bag in Box Format)
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10L
R-RSB2205
Redox Standard 220mV @25°C (Bag in Box Format)
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5L
R-RS22010
Redox Standard 220mV @25°C
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10L
R-RS2505
Redox Standard 250mV @ 25°C
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5L
R-RS250
Redox Standard 250mV @25° C
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500ml
R-RS25010
Redox Standard 250mV @25° C
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10L
R-RSB25010
Redox Standard 250mV @25°C (Bag in Box Format)
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10L
R-RSB2505
Redox Standard 250mV @25°C (Bag in Box Format)
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5L
R-RS300
Redox Standard 300mV @25° C
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500ml
R-RS30010
Redox Standard 300mV @25° C
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10L
R-RS358
Redox Standard 358mV @25° C
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500ml
R-RS35810
Redox Standard 358mV @25° C
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10L
R-RSB35810
Redox Standard 358mV @25°C (Bag in Box Format)
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10L
R-RSB3585
Redox Standard 358mV @25°C (Bag in Box Format)
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5L
R-RS40010
Redox Standard 400mV @25° C
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10L
R-RS400
Redox Standard 400mv @25°C
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500ml
R-RSB44010
Redox Standard 440mV @25°C (Bag in Box Format)
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10L
R-RS4655
Redox Standard 465mV @ 25° C 5Lt
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5L
R-RS465TT
Redox Standard 465mV @ 25° C Twin Neck
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500ml
R-RS46525
Redox Standard 465mV @ 25°C
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250ml
R-RS465
Redox Standard 465mV @25° C
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500ml
R-RS46510
Redox Standard 465mV @25° C
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10L
R-RS46825TT
Redox Standard 468mV @ 25°C Twin Neck
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250ml
R-RS47525
Redox Standard 475mV @25° C
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25L
R-RS600
Redox Standard 600mV @25° C
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500ml
R-RS60010
Redox Standard 600mV @25° C
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10L
R-RS650TT
Redox Standard 650mV @ 25° C Twin Neck
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500ml
R-RSB65010
Redox Standard 650mV @25°C (Bag in Box Format)
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10L
R-RS650
Redox Standard 650mV @25°C
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500ml
R-RS65010
Redox Standard 650mV @25°C
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10L
R-RS6505
Redox Standard 650mV @25°C
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5L

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