Abstract
A simple titration (oxidimetry) method using a methylene blue-platinum colloid reagent is effective in determining the concentration of hydrogen gas in an aqueous solution. The method performs as effectively as the more complex and expensive electrochemical method.
Highlights
Molecular hydrogen is useful for various novel medical and therapeutic applications
We investigated a simple oxidimetry method that involves a redox reaction of methylene blue (MB) oxidant in the presence of a colloidal platinum (Pt) catalyst
MB is well known to react with an equimolar amount of hydrogen in the presence of Pt or palladium to produce colorless reduced MB, as follows: MB + 2H+ + 2e− → leucoMB
Summary
Molecular hydrogen is useful for various novel medical and therapeutic applications. In air, hydrogen gas is potentially explosive, whereas, in an aqueous solution, it is safe and convenient to use. The concentration of hydrogen in water by a titration by using the MB-Pt reagent (Figure 1). The MB-Pt reagent was added dropwise to 20-mL samples of hydrogen-rich water until the solution changed from blue to colorless (Figure 2).
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