A graphene magnetic nanoparticles(G-Fe3O4) was prepared,and used as the adsorbent for the preconcentration of trace amount of copper using 1-(2-pyrrole azo)-2-naphthol(PAN) as chelating reagent prior to its determination by flame atomic absorption spectrometry.This magnetic solid phase extraction method,which takes the advantages of both the high adsorption ability of graphene nanoparticle and the easy phase separation of the magnetic materials from the sample solution,could avoid of the time-consuming experimental procedures in the traditional solid phase extraction,such as centrifugation and filtrations.Various experimental parameters affecting the extraction efficiencies were investigated.Under the optimum conditions,the concentration factor for the analyte was 80.4.The linearity of the method was in the range of 0.5-100 μg/L with a correlation coefficient(r) of 0.998 1.The limit of detection(S/N=3) was 0.067 μg/L.The relative standard deviations(RSDs,n=5) varied from 2.1% to 5.2%,and the spiked recoveries were in the range of 94%-103%.The method was proved to be simple,convenient and sensitive for the determination of trace copper in environmental water samples.