Abstract

Mohammd Yari¹, Ali Moghimi^2*and Shabnam fakhari³

DOI : http://dx.doi.org/10.13005/ojc/320343

A simple, highly sensitive, accurate and selective method for determination of trace amounts of Cu²⁺in water samples .In this paper, chitosan grafted with graphene oxide sheets showed an increased surface area was used to encapsulate nano-Fe₃O₄ and produce a nano-Fe₃O₄-encapsulated-chitosan/graphene oxide sorbent based new sorbent was prepared. Flame atomic absorption spectrometer was utilized for determination of Cu²⁺.Some of the important parameters on the preconcentration and complex formation were selected and optimized. Under the optimized conditions the limit of detection (LOD) and limit of quantification (LOQ)were 0.30,0.750 and the proposed method has a good reproducibility 0.90% (RSD %).The enrichment factor was 200 and the percentage of recovery was in the range of 95-100% .The method was successfully applied to the recovery of Cu²⁺in different type of water samples. Graphene oxide and its derivates such as magnetic nano-Fe₃O₄-encapsulated-chitosan/graphene oxide in this study is full of potential to use as an excellent adsorbent in the extraction method like solid phase extraction(SPE) and solid phase micro extraction(SPME). In the present study, we report the application of pre concentration techniques still continues increasingly for trace metal determinations by flame atomic absorption spectrometry (FAAS) for quantification of Cu²⁺ in Formalin-fixed paraffin-embedded (FFPE) tissues from Liver loggerhead turtles. This method exhibits the superiority in compared to the other adsorption reagents because of the fact that there is no necessity of any complexing reagent and optimum pH of solution presents in acidic media.

nano-Fe3O4-encapsulated-chitosan/graphene oxide; preconcentration; SPE; Preconcentration ; FAAS; copper; Formalin-fixed paraffin-embedded (FFPE) ; tissues from Liver loggerhead turtles

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