Simultaneous detection of SO32- and PO43- anions, in aqueous solutions based on 4-(2-Pyridylazo) resorcinol (PAR) as a colorimetric chemosensor and analytical applications. Issue 15 (8th December 2022)

• Record Type: Journal Article
• Authors: Tavallali, Hossein; Parhami, Abolfath; Karimi, Mohammad Ali; Hossein-Khezri, Parisa
• Is Part Of: International journal of environmental analytical chemistry. Volume 102:Issue 15(2022)
• Page Start: 3652
• Page End: 3671
• Publication Date: 2022-12-08
• Subjects: Colorimetric chemosensor -- phosphate chemosensor -- sulphite chemosensor -- molecular logic gates; Ecology -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental chemistry -- Periodicals; Pollution -- Periodicals; 577.14
• DOI: 10.1080/03067319.2020.1811267
• Languages: English
• ISSNs: 0306-7319

Abstract

ABSTRACT: Herein, we have presented a novel bare eye detection method which is based on the anion competing for a metal receptor with a chromogenic indicator. In this essay, there are highly specific interactions among the anions and the metal ions and 4-(2-Pyridylazo) resorcinol (PAR) probe in a competition assay format. The system designing is simple and it is fast in operation so that is promising than other methods because it did not need organic solvents, preparation and separation processes, chemical modification and equipped devices. In this way, Cd 2+ and Cu 2+ ions were detected by changing colour from yellow to light orange and red, respectively (in aqueous solution), which could be distinguished by naked eyes. The selectivity of these complexes towards anions wassurveyed by competition experiments in the presence of different anions. The obtained results were shownin which there were variations in the UV-Vis spectrum and colour of the solution of the [PAR-Cd 2+ ] in the presence of SO3 2- and PO4 3- anions. The high sensitivity and selectivity for phosphate and sulphite were obtained by changing the metal ions. That is, by using Cu 2+ instead of Cd 2+ in the PAR-metal, only SO3 2- anion was detected and the detection limit of SO3 2- ion was obtained 1.20 µmol L −1 . This novel system has employed for simultaneous determination SO3 2- and PO4 3- anions in some real samples by changing the metal ion in the complex. Furthermore, the INHIBIT molecular logic gate was obtained using chemical inputs (Cu 2+ and SO3 2- ) and UV-Vis absorbance signals as the output.