Abstract
In this work, a sensitive method for the determination of cadmium by flame atomic absorption spectrometry (FAAS) was established by combining dispersive solid-phase extraction (DSPE) with thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS). Nano-TiO2 was used as adsorbent, and the dispersive extraction simplified the operation procedure. Through the application of slurry sampling, the on-line combination of DSPE with TS-FF-AAS was established and the time-consuming elution step after DSPE was avoided. Problems of nebulization associated with previous methods based on the coupling of FAAS and SPE were overcome. DSPE combined with TS-FF-AAS significantly improved the analytical performance of the modified FAAS, which established a sensitive method for the determination of cadmium based on FAAS. Under the optimal conditions, the limit of detection (LOD) was 0.04 µg/L, which was better by an enhancement factor of 56. Compared to direct FAAS, the factor was 596. The method was applied to the determination of environmental water samples with satisfactory results.
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