▎ 摘　　要

ss-cyclodextrin/graphene oxide (GO-ss-CD) was applied for dispersive micro-solid phase extraction (DMSPE) of uranyl ions (UO22+) from water samples and their determination by energy-dispersive (EDXRF) and totalreflection X-ray fluorescence spectrometry (TXRF). The structure of GO-ss-CD was characterized by X-ray photoelectron spectroscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy. The results of batch adsorption experiment indicate that the maximum recoveries for UO22+ ions are observed at pH 4.5. The Langmuir isotherm model fits the adsorption data, which stands for the chemisorption mechanism. The obtained adsorption capacity of 87.7 mg g(-1) indicates a great potential of the synthesized adsorbent in the UO22+ ions preconcentration. The GO-ss-CD exhibits high resistance to high ionic strength (up to 2 mol L-1), indicating that high salinity samples can be treated with the evaluated preconcentration procedure. The obtained limit of detection values were 0.40 mu g L-1 for the EDXRF and only 0.014 mu g L-1 for TXRF analysis. The accuracy of the method was verified by analyzing certified reference material (spring water NIST-SRM 1640a) and spiked water samples (mineral, lake, river, and artificial sea water).