Abstract

Hanie Arbabi Rashid¹, Ali Moghimi^1*

DOI : http://dx.doi.org/10.13005/ojc/300140

A new sensitive and  simple method  was developed  for  the  preconcentration of trace amounts  of Ni  using 1-(2-pyridylazo)-2-naphthol (PAN)  as chelating reagent  prior  to its determination by flame atomic absorption spectrometry. The proposed  method is based on the uti- lization of a column packed with graphene as sorbent. Several effective parameters on the extraction and  complex formation were selected and  optimized.  Under  optimum  conditions,  the calibration graph   was  linear  in  the  concentration  range   of  5.0–240.0 µg L-1    with  a  detection   limit  of 0.36 µg L-1.   The   relative   standard  deviation   for   ten   replicate   measurements    of   20.0  and 100.0 µg L-1  of Ni were 3.45 and 3.18%, respectively. Comparative studies showed that  graphene is superior to other adsorbents  including C18 silica, graphitic  carbon,  and single- and multi-walled carbon  nanotubes for the extraction  of Ni. In the present study, we report the application of preconcentration techniques still continues increasingly for trace metal determinations by flame atomic absorption spectrometry (FAAS) for quantification of Ni in Formalin-fixed paraffin-embedded (FFPE) tissues from Liver loggerhead turtles. The proposed  method  was successfully applied  in the analysis  of  four  real  environmental water  samples.  Good   spiked  recoveries  over  the  range  of 95.8–102.6% were obtained.

Graphene; Solid-phase extraction; Preconcentration;Flame atomic absorption spectrometry; Formalin-fixed paraffin-embedded (FFPE) ; tissues from Liver loggerhead turtles;Ni

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