Armin K.: Why do you actually need to measure the redox potential of the alkaline activated water if you have already determined the pH value? There is the Nernst equation for conversion?
The redox potential or ORP (oxidation-reduction potential) in millivolts compared to a reference electrode (—>redox measurement) is a measure of the willingness of an aqueous solution to attract (+mV) or release (-mV) electrons. Acids attract electrons (oxidize) because of the H+ ions, bases lose electrons (reduce) because of the OH– ions. The whole thing is an exchange process called a redox reaction. Such a redox reaction also takes place on the measuring electrode, which is either oxidized or reduced, which is then displayed to us as a mV value.
Since in a redox reaction in an aqueous solution, acids and bases balance each other out by H+ and OH- becoming water, there is also a connection between pH value and redox potential that can be calculated using the Nernst equation:
ΔE = -0,059 V (pH 1 – pH 2)
More on this: http://de.wikipedia.org/wiki/Nernst-Gleichung
In addition to the redox potential Eh, water analysis also uses the rH value determined. The University of Erlangen writes about this: (http://www.angewandte-geologie.geol.uni-er- langen.de/paramete.htm): “This is a pH-independent criterion for the redox capacity of a water sample. The rH value is defined as the negative decadal logarithm of the hydrogen partial pressure (i.e. rH = -log pH), with which a platinum electrode would have to be loaded in order to exert a reducing effect corresponding to the solution.
rH = 2 x (Eh/EN) + 2 pH
Since the conversion from Eh to rH values is based on the NERNST voltage (59,16 mV), and since the change in Eh values per pH step under groundwater conditions can deviate from this NERNST voltage, unlike in laboratory tests, it turns out The conversion may be problematic for very acidic or very basic groundwater (HÖLTING 1996).
The (reducing) properties of water can be characterized as follows according to the rH values determined:
rH = 0 to 9: strong reducing properties,
rH = 9 to 17: predominantly weakly reducing,
rH = 17 to 25: indifferent systems,
rH = 25 to 34: predominantly weakly oxidizing,
rH = 34 to 42: strongly oxidizing.”
Dietmar Ferger (Jungbrunnenwasser, Weil am Rhein 2011, p 87) has it rH value of average alkaline activated water (pH 9,5; ORP – 400 mV) calculated as follows: rH = 2 x pH 9,5 + (2 x (-400 mV)) / 59,1 = 5,5
The specified ORP is to be understood as the SHE value, i.e. converted to a hydrogen electrode. This gives the alkaline activated water strong reducing properties.
For Reverse osmosis water (pH 6,5; ORP + 400 mV (SHE)), Ferger calculates one rH value of 26,5. It is therefore predominantly weakly oxidizing.
For strongly oxidizing Anolyte with added salt (pH 2; ORP + 1100 mV) it gives one rH value of 41,2 on, i.e. strongly oxidizing.
For comparison:
The most powerful continuous flow water ionizer currently available with a new electrode coating (AquaVolta® ECA Tractor), for example, produces a redox potential (SHE) of -9,4 mV at slightly basic pH values (pH 413).
rH = 2 x pH 9,4 + (2 x (-413)) / 59,1 = 4,8
This device produces in ECA mode, i.e. as anolyte with added salt
rH = 2 x pH 2,4 + (2 x (+1283)) / 59,9 = 45,8
This is extremely oxidizing.
However, the Russian researchers V. Prilutsky and V. Bakhir have found that the redox potential of electrolytically treated water, calculated according to the Nernst equation, does not correspond to that during the —> Relaxation time actually measured.
It is much larger than calculated in the anode chamber and much smaller than calculated in the cathode chamber. (Electrochemically activated water: anomalous properties, mechanism of biological action, Moscow 1997)
This “anomaly” of activated water during the —> Relaxation time is actually a very crucial peculiarity on which its extraordinary properties are based.
It is therefore, as the subtitle of my book about electro-activated water says, “An invention with extraordinary potential”. Because of this “anomaly”, measuring the redox potential cannot be avoided by doing calculations.
However, it is not a real anomaly, i.e. an inexplicable miracle. The presence of dissolved hydrogen gas with the simultaneous absence of dissolved oxygen gas is the cause of the extraordinary redox potential in basic, and with reversed gas ratios in acidic activated water.
Of course, as a consumer you don't have to measure, especially since —> redox measurement is not that easy. The special feature of active water has been known for a long time and people don't constantly check other known special features of the water, for example whether lakes really always freeze over from above.
If the redox potential of the activated water is very negative, it can also be used to remove rust, as shown here using the example of a rusted iron chain that was soaked in alkaline activated water for 30 minutes.
Excerpt from the book by Karl Heinz Asenbaum: “Electro-activated water – An invention with extraordinary potential. Water ionizers from A – Z”
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