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- W2019244865 abstract "Since heavy metal pollution is a significant global environmental problem and very dangerous to human health, the improved methods for detecting heavy metals are required recently. Colorimetric chemosensors are now considered as one of the most effective analytical method used in the environment monitoring. New direct dyes having the function of colorimetric chemosensors were synthesized. When metal ions such as <TEX>$Al^{3+}$</TEX>, <TEX>$Ca^{2+}$</TEX>, <TEX>$Cd^{2+}$</TEX>, <TEX>$Cr^{3+}$</TEX>, <TEX>$Cu^{2+}$</TEX>, <TEX>$Fe^{2+}$</TEX>, <TEX>$Fe^{3+}$</TEX>, <TEX>$Hg^{2+}$</TEX>, <TEX>$Li^+$</TEX>, <TEX>$Mg^{2+}$</TEX>, <TEX>$Na^+$</TEX>, <TEX>$Ni^{2+}$</TEX>, <TEX>$Pb^{2+}$</TEX> and <TEX>$Zn^{2+}$</TEX> were added each solution of new direct dyes, the color of solution was changed and can be easily detected with naked eyes without expensive experimental equipment such as atomic absorption spectrometer (AAS) or inductively coupled plasma?mass spectrometer (ICP-MS). The new benzidine analogues were diazotized and reacted with couplers such as H-acid, J-acid, Chromotropic acid, Nevill-winther acid and gamma acid to synthesize new direct dyes. The structures of the new direct dyes were confirmed by high resolution mass spectrometer (FAB ionization) and evaluated with UV-Vis spectroscopy. The UV-VIS spectroscopy was measured for the dye solutions by adding various concentrations of metal ions. It was observed that the absorbance in UV-Vis spectra was changed as the heavy metal ions were added." @default.
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- W2019244865 date "2009-10-27" @default.
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- W2019244865 title "Detection of Heavy Metal Ions in Aqueous Solution Using Direct Dye Chemosensors" @default.
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- W2019244865 doi "https://doi.org/10.5764/tcf.2009.21.5.051" @default.
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