The measurement of molecular hydrogen in hydrogen rich water (HRW) is often carried out using inadequate methods.
The educational video here explains the connection between pH value, redox potential (ORP) and the ppm value of dissolved hydrogen.
What is presented goes very deep into the subject matter, please also note the entire individual sections of the entire PDF, further down on this page.
Download German version: The relationship between dissolved H2, pH value and redox potential.pdf
Download original version in English: Randy Sharpe, Analysis Relationship between Dissolved Molecular Hydrogen Gas pH and ORP using Nernst Equation.pdf
Author: Randy Sharpe
Original title: Analysis of the Relationship between Dissolved Molecular Hydrogen Gas, pH and ORP using the Nernst Equation Rev. 4.4.1. Copyright 2017, Henderson, USA. All rights reserved.
German title: The connection between dissolved H2, pH value and redox potential (ORP).
The relationship between dissolved H2, pH and redox potential (ORP).
An analysis using the Nernst equation.
For decades, alkaline water ionizers have been marketed claiming to provide various health benefits. Marketing people use an ORP meter to show that their water is “different” from other types of water.
Hydrogen water can also be called H2 water, hydrogen-rich water, hydrogen infusion water, or hydrogen-enriched water.
The ORP meter is a tool commonly used by service personnel and technicians in the commercial and industrial sectors, including environmental, wastewater treatment, catering, pool & spa and horticulture. Combined with other measured parameters such as temperature, pH and chlorine content, a high positive redox measurement can indicate the effectiveness of disinfectants (oxidants) in killing various pathogens.
As mentioned previously, water that contains dissolved H2 gas will typically measure a negative ORP (-100 to -750 mV or more). Advertising often states that this is an indication that electricity has given the water various “special qualities” during electrolysis. Along with this, it is claimed that the water has a “smaller molecular structure”, contains “free electrons” or has a “negative charge”. While only a basic knowledge of chemistry is required to debunk such claims, they persist and are even spreading.
We've already mentioned the ORP value a few times, but what's behind it? The short form “ORP” stands for “oxidation-reduction potential,” a measurement that gives an indication of the tendency of water to act as either an oxidizing or reducing agent. Discussions about ORP usually focus on the “O” and the “R” (oxidation and reduction). However, you see less […]
During electrolysis, the electrons from the cathode are bound to H+ ions. They don't flow around in water as free electrons.
Chemists have assigned voltage potentials to different chemical species according to their propensity to accept electrons. These voltage potentials are called “standard reduction potentials”. Table 1 contains a list of standard reduction potentials. Here the reduction potentials for different species can be compared under standard conditions of concentration, pressure and temperature.
pH The name “hydrogen” can refer to one of four different ways: The term “pH” always refers to H+, the positive hydrogen ion.
ORP values predicted by the Nernst equation are calculated under ideal conditions. While actual field measurements of ORP vary depending on a number of factors, the relationships between pH, H2 and ORP remain the same.
You may be wondering, “What level of dissolved H2 is needed to produce a negative ORP”? To determine the amount of H2 needed to produce even a “moderate” level of negative ORP, we can use the Nernst equation. So we can predict the ORP at different H2 concentrations while the pH […]
In this way, the individual effect that each variable has on the result can be observed. In our case we only have two variables of interest, the concentrations of H2 and H+, both of which have some influence on the ORP.
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