An important parameter for the calculating of rate constants
or
for process enhancement, both for sciences and engineering, is the
knowledge of gas concentrations of gas–liquid systems. We introduce
the method SelPULCON for the determination of gas concentrations in
liquids for NMR active substances (e.g., hydrogen) by means of NMR
spectroscopy. This method is based on the “principle of reciprocity”
and correlates the absolute signal intensity of the sample with that
of an external reference. As a selective excitation is applied, this
method is independent of whether the solvent is deuterated or not.
In this way one can measure the gas concentration in almost all solutions
and utilize all of the advantages of the NMR spectroscopy (e.g., for
in situ or OPERANDO investigations). To demonstrate this method, we
determined the hydrogen saturation concentrations in eight organic
solvents at 25 °C and 0.101 MPa total pressure, for example,
in dichloromethane (c = 1.51 mmol·dm–3, b = 1.15 mmol·kg–1) and
in 2,2,2-trifluoroethanol (c = 3.28 mmol·dm–3, b = 2.39 mmol·kg–1).
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