Ultrasound-assisted dispersive micro-solid phase extraction of Pb(II) in water samples with in situ synthesis of magnetic Fe3O4-PbS nanocomposites followed by electrothermal atomic absorption spectrometry determination

Herein, an ultrasound-assisted dispersive magnetic micro-solid phase extraction (DM-?SPE) approach, along with electrothermal atomic absorption spectrometry (ETAAS) for the determination of lead at trace level in spring, well, river mineral and tap water samples was developed. The step is based on synthesis PbS, following sonochemical decomposition L-cysteine used as sulphide precursor its anchoring onto bare magnetite nanoparticles yielding Fe3O4@PbS nanocomposite. Overall, DM-?SPE situ precipitation PbS retention sorbent requires a time short 6 min. After trapping Pb(II) nanocomposite easily separated from aqueous matrix by applying external field analyzed ETAAS slurry sampling. Different parameters involved both preparation/extraction Pb quantification were optimized. Under optimal conditions, method showed detection limit 0.02 ?g L?1 0.07 Pb. repeatability, expressed relative standard deviation 2% (for 0.6 L?1; n = 3). An experimental enrichment factor 79 efficiency 99% obtained. Finally, applied ultratrace levels samples, showing quantitative recoveries range 95–100%.