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Dispersive micro-solid-phase extraction using chitosan/polymethacrylate/clay bionanocomposite followed by UV–Vis spectrophotometry for determination of zinc

H. Deniz E. Uygun, Mine Antep, M. Nalan Demir, and Melek Merdivan

Center for Fabrication and Application of Electronic Materials, Dokuz Eylul University, Izmir, Turkey

 

E-mail: melek.merdivan@deu.edu.tr

Received: 6 February 2020  Accepted: 21 April 2020

Abstract:

A novel chitosan-poly(methacrylate)-clay (CTS-pHEMA-MMT) superabsorbent bionanocomposite was prepared by radical copolymerization method and characterized by Fourier-transform infrared spectroscopy, thermal gravimetric analysis, X-ray diffraction analysis and scanning electron microscopy. The CTS-pHEMA-MMT composite was applied as a sorbent in dispersive micro-solid-phase extraction (D-µ-SPE) of zinc before its spectrophotometric determination after eluting with 4-(2-pyridylazo) resorcinol solution. Under the optimized experimental conditions, the developed D-µ-SPE method with aqueous standard Zn solutions presented a linear working range from 10 to 1000 ng mL−1 with a correlation coefficient of 0.996, a detection limit of 3.1 ng mL−1 and a relative standard deviation better than 3.5% (n = 5) for 10 ng mL−1 and 50 ng mL−1 of Zn(II). The preconcentration factor and the sorption capacity of the synthesized sorbent for zinc were 100 and 5.04 mg g−1, respectively. The recoveries for zinc in tap water, drinking water, milk, butter, and vitamin tablet samples were obtained in the range of 93.7–102.5% for spiked 10 ng mL−1 and 50 ng mL−1 of Zn(II).

Keywords: Zinc; Bionanocomposite; D-μ-SPE method; UV–visible spectrophotometry

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01169-3

 

Chemical Papers 74 (10) 3399–3408 (2020)

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