MOF-based material has detection limit as low as traditional Karl Fischer titration
Researchers from Germany have devised a new way to detect trace water in solvents. Their technique combines luminescent metal–organic frameworks (MOFs) with a magnetic core to give a system that users can see change colour then fish out of the sample once the test is complete.

Source: Royal Society of Chemistry The microparticle core contributes superparamagnetic properties to the compound, while the shell exhibits a mixed yellow luminescence originating from Eu3+ and Tb3+
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Composite materials combining multiple luminescent MOFs and superparamagnetic microparticles for ratiometric water detection
T. Wehner, M. T. Seuffert, J. R. Sorg, M. Schneider, K. Mandel, G. Sextl and K. Müller-Buschbaum
J. Mater. Chem. C, 2017, Advance Article