The Fluorescence Of A Mercury Probe Based On Osthol

The ability of osthol (OST) to recognize mercury ions in aqueous solution was studied using fluorescence, UV-vis spectrophotometry, mass spectrometry, and H-1 NMR spectroscopy, and the recognition mechanism is discussed. The results showed that OST and Hg2+ can form a complex with a stoichiometric ratio of 1:1. The binding constant was 1.552 x 10(5) L.mol(-1), having a highly efficient and specific selectivity for Hg2+. The fluorescence intensity of OST showed a good linear correlation with the Hg2+ concentration (6.0 x 10(-5) to 24.0 x 10(-5) mol.L-1, R-2 = 0.9954), and the detection limit of the probe was 5.04 x 10(-8) mol.L-1, which can be used for the determination of Hg2+ traces.