  Determining the oxidation states of metals assumes great importance in
various applications because a variation in the oxidation number can
drastically influence the material properties. As an example, this becomes
evident in edible liquids like wine and oil, where a change in the oxidation
states of the contained metals can significantly modify both the overall
quality and taste. To this end, here we present the MITIQO project, which aims
to identify oxidation states of metals in edible liquids utilizing X-ray
emission with Bragg spectroscopy. This is achieved using the VOXES crystal
spectrometer, developed at INFN National Laboratories of Frascati (LNF),
employing mosaic crystal (HAPG) in the Von Hamos configuration. This
combination allow us to work with effective source sizes of up to a few
millimeters and improves the typical low efficiency of Bragg spectroscopy, a
crucial aspect when studying liquids with low metal concentration. Here we
showcase the concept behind MITIQO, for a liquid solution containing oxidized
iron. We performed several high-resolution emission spectra measurements, for
the liquid and for different powdered samples containing oxidized and pure
iron. By looking at the spectral features of the iron's K$\beta$ emission
lineshape, we were able to obtain, for a liquid, a result consistent with the
oxidized iron powders and successfully quantifying the effect of oxidation.
