ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Simultaneous preconcentration and determination of trace quantities of inorganic arsenic species in water using Ni_0.5Zn₀.₅Fe₂O₄ magnetic nanoparticles

Abbas Afkhami, Samira Aghajani, Tayyebeh Madrakian, and Hasan Bagheri

Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran

E-mail: afkhami@basu.ac.ir

Received: 19 August 2019  Accepted: 10 February 2020

Abstract:

Nickel–zinc ferrite (Ni_0.5Zn₀.₅Fe₂O₄) nanosorbent was prepared and used for the efficient simultaneous preconcentration of arsenite and arsenate ions from aqueous solutions. The prepared nanoparticles were characterized by XRD measurements which indicated that the Ni_0.5Zn₀.₅Fe₂O₄ nanoparticles were synthesized well. The SEM results showed an average diameter of 27 nm for the nanoparticles. The adsorption capacity was found to be 35.8 and 62.5 mg g⁻¹ for As(III) and As(V), respectively. The adsorbed ions were then quantitatively eluted using 2 mL of 2 M NaOH solution as an elution solvent and determined spectrophotometrically. The maximum preconcentration factor for both the investigated ions was found to be 100. As(III) and As(V) species were determined in the mixture based on the difference in their adsorption behavior at different pHs. For an initial sample volume of 200.0 mL, the calibration graph was linear in the range 0.3–50.0 ng mL⁻¹ of As(III) and 0.2–75.0 ng mL⁻¹ of As(V) concentration. The method resulted in a successful determination of As(III) and As(V) in water samples.

Keywords: Nickel–zinc ferrite nanoparticles; Inorganic arsenic ions; Simultaneous preconcentration; Arsenic determination; Speciation; Water samples

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01097-2

Chemical Papers 74 (8) 2529–2535 (2020)