Synthesis and Characterization of a Silica/Tungsten(VI) Oxide and Its Performance for the On-Line Solid-Phase Extraction (SPE) of Nickel Ions from Aqueous Media with Determination by Flame Atomic Absorption Spectrometry (FAAS)

Author(s)

Barreto, Tulio Rolim ^[1] ; Gorla, Felipe Augusto ^{[1, 2]} ; Ferreira, Milena do Prado ^[1] ; Araujo Duarte, Pedro Henrique ^[3] ; Ribeiro, Emerson Schwingel ^{[3, 4]} ; Afonso, Julio Carlos ^[3] ; Teixeira Tarley, Cesar Ricardo ^{[1, 5]}

Affiliation

^[1] State Univ Londrina UEL, Dept Chem, Rodovia Celso Garcia Cid, PR 445, Km 380, BR-86050482 Londrina, Parana - Brazil

^[2] Fed Inst Parana IFPR, Campus Assis Chateaubriand, Assis Chateaubriand - Brazil

^[3] Fed Univ Rio de Janeiro UFRJ, Inst Chem, Rio De Janeiro, RJ - Brazil

^[4] Paulista State Univ Julio de Mesquita Filho, Natl Inst Alternat Technol Detect Toxicol Evaluat, Inst Chem, UNESP, Araraquara, SP - Brazil

^[5] Univ Estadual Campinas, UNICAMP, Natl Inst Sci & Technol Bioanal INCTBio, Dept Chem, Inst Chem, Campinas - Brazil

• Document type: Journal article
• Source: Analytical Letters; v. 54, n. 7 JUL 2020.
• Web of Science Citations: 1

Abstract

The present paper describes a new analytical method exploiting a SiO2/WO(3)mixed oxide as an adsorbent synthesized via sol-gel process for the preconcentration of Ni2+. This material was characterized by energy dispersive X-ray fluorescence spectroscopy, powder X-ray diffraction, Fourier transform infrared spectroscopy, analysis of the specific surface area by Brauner, Emmett and Telle multipoint method, the average pore size and pore volume by Barrett-Joyner-Halenda method, scanning electron microscopy, and electron dispersive spectroscopy. The mixed oxide presented high surface area (710.9 m(2)g(-1)), average pore size of 35.1 angstrom, and average pore volume of 0.128 cm(-3)g(-1). This material was used as the an adsorbent in an on-line procedure for pre-concentration of solid phase extraction, based on the adsorption of Ni(2+)ions at pH 10.5 followed by elution with 1.0 mol L(-1)HNO(3)and determination by flame atomic absorption spectrometry. Under optimized conditions, a linear range from 10.0 to 170.0 mu g L-1, an enrichment factor of 38.8-fold, and limits of detection and quantification of 4.23 mu g L(-1)and 14.11 mu g L(-1)were obtained. The precision of method, estimated as percentage of relative standard deviation of ten replicates of 30.0, 90.0 and 150.0 mu g L(-1)Ni(2+)solutions, was lower than 4.10%. The method was employed for analysis of water samples and the accuracy was attested by addiction and recovery tests, with satisfactory recoveries (98.4-109.2%). Thus, the developed material can be successfully applied to water samples for monitoring of Ni(2+)at very low levels without matrix influence. (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