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  • Title: A ratiometric probe for the selective time-gated luminescence detection of potassium in water.
    Author: Weitz EA, Pierre VC.
    Journal: Chem Commun (Camb); 2011 Jan 07; 47(1):541-3. PubMed ID: 21103471.
    Abstract:
    A europium probe for the ratiometric detection of potassium in water is presented. This probe demonstrates high sensitivity, with an affinity for K(+) in the mM range, and high selectivity for K(+) over Na(+), Ca(2+), Mg(2+) and Li(+). The long luminescence lifetime of the probe and its large Stokes shift further enable accurate determination of the concentration of K(+) in complex aqueous media.
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