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Colorimetric detection of Hg 2+ using a mixture of an anionic azo dye and a cationic polyelectrolyte in aqueous solution
Author(s) -
Inoue Koshiro,
Aikawa Shunichi,
Fukushima Yasumasa
Publication year - 2018
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5567
Subject(s) - bathochromic shift , naked eye , polyelectrolyte , cationic polymerization , chemistry , aqueous solution , metal ions in aqueous solution , titration , chloride , inorganic chemistry , absorption spectroscopy , nuclear chemistry , metal , polymer chemistry , detection limit , organic chemistry , chromatography , polymer , physics , quantum mechanics , fluorescence
We investigated a colorimetric chemosensor for Hg 2+ based on a mixture of xylidyl blue I as an anionic organic dye and poly(diallyldimethylammonium chloride) as a cationic polyelectrolyte in an aqueous solution at pH 7.5. The addition of Hg 2+ to the mixture induced a bathochromic shift in the absorption spectra with a distinct color change from red to green which was readily identifiable by the naked eye, whereas the other metal ions gave rise to insignificant color changes. By contrast, upon adding Hg 2+ to xylidyl blue I alone, the solution underwent no significant change in color. Moreover, a stoichiometric ratio for the complex between xylidyl blue I and Hg 2+ in the presence of poly(diallyldimethylammonium chloride) was determined to be 1:1 by the absorption titration curve and Job's plot. Thus, the mixture can be used as a selective naked‐eye colorimetric chemosensor for Hg 2+ over other common metal ions. This study raises the possibility that the combination of an organic dye and an oppositely charged polyelectrolyte is a potential candidate for the easy construction of a new chemosensor system. © 2018 Society of Chemical Industry