Table 2.

Description of parameters needed for the calculation of oxygen and probe concentrations

Symbol	Definition
$I_0^{\mathit{\text{an}}}$	Intensity of EPR-off signal of an analyzed sample
$I_0^1,I_0^2,I_0^3$	Intensities of EPR-off signal of the reference samples 1, 2 and 3
α	EPR resonator efficiency, $\mu \mathrm{T}/\sqrt{\mathrm{W}}$
a1	Oxygen-dependent line broadening, μT/mM
a2	Concentration-dependent line broadening, μT/mM
a3	Intrinsic line width of the probe, μT
Einf	The enhancement at infinite power and at infinite probe concentration
r	Relaxivity of the paramagnetic probe, mM−1s−1
T1	Relaxation time of the protons in the presence of the probe, s
T10	Relaxation time of the protons in the absence of the probe, s