Solid - phase extraction of Lead in saline matrix using by GF- AAS with multivariate optimization

B. Sefati, M. Masrournia, H. Beheshti, J.Feizy


This work presents a novel method investigated in the pre-concentration of lead ion as well as the matrix effect eliminated in high salinity medium using solid phase extraction by graphite furnace Atomic Absorption spectroscopy (GFAAS). Fe3O4-graphene was used as the sorbent while 1M HNO3 was used as the extraction solvent. Parameters such as: pH, amount of sorbent, time of adsorption, time of desorption and, stirring rate affecting the extraction efficiency of the method were studied and optimized by utilizing two decent optimization methods; factorial design and central composite design (CCD). The limit of detection and limit of quantification were 4.4 and 14.8 ng/mL, respectively The accuracy of the method was evaluated by analyzing a spiked real sample. Good spiked recoveries over the range 98.8-103.6 % were obtained. Under the optimum conditions, the calibration graph was linear over the range 5-50 ng/mL. The relative standard deviation was 4.4 % for four repeated determinations at a concentration of 20 ng/mL.



Solid-phase extraction; furnace Atomic Absorption spectroscopy; Lead; Multivariate optimization; Plackett–Burman design; Central composite design; food sample

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