Quantification of H2O2 concentrations in aqueous solutions by means of combined NMR and pH measurements
Literature Information
Lisandro Buljubasich, Bernhard Blümich, Siegfried Stapf
The NMR transverse relaxation time T2, determined by a CPMG multipulse sequence, of aqueous hydrogen peroxide (H2O2) solutions strongly depends on the rate of exchange of the spin-bearing protons between the H2O2 and H2O molecules. For pulse separations exceeding the inverse exchange rate, this value becomes a constant only depending on proton exchange time and magnetic field strength. Since this exchange time depends in a non-analytical way on the concentration of H2O2 and on the pH value, a measurement of T2 and pH allows the inversion of the data for the non-invasive determination of the H2O2 concentration. The generation of calibration data for a range of concentrations and pH values is presented and is applied to a heterogeneously catalyzed H2O2 decomposition involving commercial catalyst pellets. The evolution of the concentration during the course of reactions is monitored and the long-time deactivation of the pellet is demonstrated using this technique. The method is suggested as a means for contact-free and non-invasive on-line monitoring of H2O2 concentrations.
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