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A simple, highly sensitive, accurate and selective method for determination of trace amounts of Pb2+in water samples .In this paper, a nano Graphene oxide with covalently linked porphyrin (GO–H2P) based new sorbent was prepared. The modified nano Graphene oxide (GO–H2P) was used for preconcentration of Pb(II) from aqueous solutions. The analytical variables were optimized by central composite design (CCD). Flame atomic absorption spectrometer was utilized for determination of Pb(II). The analytical features for sorption were found to be 5.2; 4.3 mL min-1 and 55.0 mL for pH, flow rate and sample volume, respectively. HNO3 was used as eluent and maximum preconcentration factor was found to be 200.Elution parameters were also determined as 4 mL min-1; 0.6 mol L-1 and 5.1 mL forflow rate, eluent concentration and eluent volume, respectively.Limit of detection and limit of quantification were found to be 49.6 and 163.7 ng L-1, respectively. Validation of the developed method was performed using certified reference material (TMDA-53.3). The methodology was applied for determination of Pb(II) in natural water samples and satisfactory results were obtained.

Extractionof Lead(II) with Functionalization of Nano Graphene oxide with Prior to determination by Flame Atomic Absorption Spectrometry