Superparamagnetic microparticles, are covered with moisture-sensitive luminescent compounds, and t

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Superparamagnetic microparticles, as well as various processes for their preparation The invention concerns, wherein the superparamagnetic microparticles have a siliceous matrix with embedded therein and on at least a portion of the nanoparticles with reversible magnetic properties of these particles have at least one moisture-sensitive luminescent surface coordination compound, the anionic is chosen from monomeric, oligomeric or polymeric coordination compounds with at least one cationic coordination centre M two-or three-dimensional, wherein is selected from the metal atoms of the rare-earth elements M with atomic numbers 57 to 71, scandium, yttrium, calcium, strontium, barium, aluminum, gallium and indium, wherein the coordination sphere of the at least in part by electron-rich centres of one or more and/Coordination Centre M neutral ligands L is saturated or, at least one of such electron-rich centres with a free electron pair or any other electron donor-structure is involved in binding for coordination centre M. The according to the invention are suitable for the detection of moisture in a gas or microparticles in an aprotic or protic liquid, with the exception of liquids, the OH have-groups. For the detection of the moisture can be employed working method, comprising the steps of : (a) providing the microparticles, (b) dispersing the particles in the liquid, (c) collecting the particles with the aid of an external magnet at a selected location a container wall bounding the liquid, (d) measuring the luminescence properties of the collected particulate mass, wherein a decrease in the luminescence intensity indicates the presence of moisture in the liquid before the beginning of the working process, and optionally (e) comparing the measured luminescence properties with the luminescence properties corresponding reference particles, whereby said initially moisture contained be determined quantitatively.