Magnetic Dispersive Solid Phase Extraction Using Recycled-graphite for GO-Fe3O4-dithizone Composite Combined with FAAS for Determination of Lead in Environmental Samples

Magnetic dispersive solid phase extraction (MdSPE) was developed to determine the concentration of lead (Pb) in real water samples, while graphene oxide-magnetite-dithizone (GO-Fe3O4-DTZ) from used graphite tubes (recycled graphite) electrothermal technique simply employed as a new sorbent improve efficiency, separated by external magnetic field and analyzed with FAAS. The synthesized evaluated for its surface property, functional group morphology Zeta potential, Fourier transform infrared spectrophotometer (FTIR), scanning electron microscope (SEM), respectively. relevant measurement parameters, such pH, time, type eluent, sample volume reusability, were optimized. Under optimal conditions, preconcentration factor 13.33. limit detection (LOD) quantitation (LOQ) obtained 0.070 0.23 mg/L, relative standard deviation (%RSD) 3.41%. Recovery values 90.1 – 123%. In addition, robustness method affirmed terms tolerance interference studies.