On-line Micro-Packed Column Solid-Phase Extraction of Cadmium Using MetalOrganic Framework (MOF) UiO-66 with Posterior Determination by TS-FF-AAS

Author(s)

Carneiro, Ana Carla R. ; Meneguin, Joziane G. ; dos Santos, Paula M. ; Corazza, Marcela Z. ; Prete, Maiyara Carolyne ; Rinaldi, Andrelson Wellington ; Tarley, Cesar Ricardo T.

• Document type: Journal article
• Source: Journal of the Brazilian Chemical Society; v. 33, n. 8, p. 11-pg., 2022-08-01.

Abstract

Metal-organic framework (MOF) UiO-66 was synthesized and evaluated as solid-phase extractor support for cadmium preconcentration in a micro-flow injection system coupled to thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) detection. The adsorbent was characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Raman spectroscopy, and textural data from N-2 adsorption/desorption isotherm data. The optimized conditions were achieved by loading 10.0 mL of a sample, containing 0.05 mol L-1 of phosphate buffer solution at pH 8.0, at a high flow rate of 10.0 mL(-1) through 20.0 mg of UiO-66 packed into a mini-column, followed by elution with 1.0 mol L-1 HCl. At these conditions, the method presented a preconcentration factor of 35.7, limit of detection of 0.03 mu g L-1 and a dynamic linear range from 0.1 to 8.0 mu g L-1. The adsorption performance of UiO-66 towards cadmium was not influenced by Pb2+, Hg2+, Fe2+, Co2+, Cu2+, Ni2+, Zn2+, Mg2+ and Ca2+ ions. Analysis of different waters samples (tap water, physiological solution, mineral water, and lake water) was carried out without matrix interference, yielding recovery values ranging from 92.0 to 111.9%. (AU)

• FAPESP's process: 14/50867-3 - INCT 2014: National Institute of Science and Technology in Bioanalysis
• Grantee: Marco Aurelio Zezzi Arruda
• Support Opportunities: Research Projects - Thematic Grants