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Methyl red (MR), a very well known acid base indicator (pK a = 5.2), shows fluorescence emission in the range 320 nm to 480 nm, with an emission maximum at 375 nm on excitation by photons at 310 nm. A fluorescent intensity titration of MR by Hg 2+ ion, a well known toxic heavy metal ion, shows quenching of the fluorescent intensity of MR. The quenching continues till the concentration ratio between MR and Hg 2+ ion becomes 1:1. Similar titration with a number of other metal ions, namely Na + ,doi:10.4491/eer.2012.17.s1.s75 fatcat:oamwn54ymzbpjkrh5hfftbeusy