Open AccessColorimetric cadmium ion detection in aqueous solutions by newly synthesized Schiff bases
Author(s) -
Ziya Aydin,
Mustafa Keleş
Publication year - 2020
Publication title -
turkish journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.239
H-Index - 46
eISSN - 1303-6130
pISSN - 1300-0527
DOI - 10.3906/kim-1912-36
Subject(s) - chemistry , detection limit , absorbance , aqueous solution , metal ions in aqueous solution , ion , acetonitrile , stoichiometry , cadmium , nuclear chemistry , inorganic chemistry , chromatography , organic chemistry
Two newly synthesized Schiff bases DMCA and DMBA were used for selective detection of Cd 2+ 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 Cd 2+ 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 Cd 2+ was found to be 2:1 and the binding constants were calculated to be 2.65 ×10 12 M -2 and 4.95 ×10 12 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.