The proposed method demonstrated great potentials of SHFe3O4/Cu3(BTC)2
composites as an appropriate adsorbent in MSPE
for the determination of trace lead in food samples. The presence
of thiol groups and high surface area of Cu3(BTC)2 composites significantly
enhanced the sensitivities and adsorption capacity of
lead. SH-Fe3O4/Cu3(BTC)2 composites with adsorbed heavy metal
ions can be simply collected from samples with magnetic separations
by an external magnetic field, and the adsorbed lead was
ready to be desorbed with HNO3 solution followed by FAAS analysis.
The developed method is rapid and sensitive and is promising
for routine analysis of trace lead in food materials.