Abstract
Two newly synthesized Schiff bases DMCA and DMBA were used for selective detection of Cd2+ over a wide range of other metal ions in acetonitrile (ACN)/ Tris-HCl buffer (10 mM, pH 7.32, v/v 2:1). The sensors can detect Cd2+ ions by colour changes from colourless to orange for DMBA and yellow to reddish for DMCA. Response of the probes towards metal ions was investigated by using UV-vis spectroscopy. The complex stoichiometry between the sensors, DMBA and DMCA, and Cd2+ was found to be 2:1 and the binding constants were calculated to be 2.65 ×1012 M-2 and 4.95 ×1012 M-2, respectively. The absorbance-based detection limits of DMBA and DMCA were calculated as 0.438 μM and 0.102 μM, respectively. The sensors were also successfully applied to real samples.
Highlights
As one of the highly toxic heavy metal ions, cadmium is widely distributed in water, soil and crops, generated from its use sources such as fertilizers, the combustion of fossil fuels, paint pigments, Ni-Cd rechargeable batteries, causing serious problems for human health [1,2,3]
Determination of Cd 2+ in real samples To evaluate the analytical applicability of the sensors, DMBA and DMCA, they were used to detect Cd 2+ ions in tap water samples collected in Osmaniye, Turkey
Design and synthesis of the sensors, DMBA and DMCA The molecular structures of the sensors were designed to contain an N-phenyl-o-phenylenediamine as a binding part for Cd 2+, a cinnamaldehyde moiety, and a benzaldehyde moiety as chromophore parts
Summary
As one of the highly toxic heavy metal ions, cadmium is widely distributed in water, soil and crops, generated from its use sources such as fertilizers, the combustion of fossil fuels, paint pigments, Ni-Cd rechargeable batteries, causing serious problems for human health [1,2,3]. The detection limits of DMBA and DMCA were calculated to be 0.438 μM and 0.102 μM, respectively.
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