Abstract A new magnetic dispersive solid phase extraction (MDSPE) method and graphite furnace atomic absorption spectrometry (GFAAS) have been combined for the simultaneous enrichment of Cd and Pb from environmental water samples including seawater, and subsequent sequential determination of both analytes. For the preconcentration, a shell structured Fe3O4@graphene oxide nanospheres was synthetized and characterized. This nanosorbent presents a large contact area and has a high surface density of polar groups. With the optimized method, the experimental detection and determination limits, calculated as the concentration of analyte giving signals equivalent to three and ten times, respectively, the standard deviation of the blank plus the net blank intensity, were 0.005 µg L−1 (detection limit) and 0.017 µg L−1 (determination limit) for Cd; and 0.008 µg L−1 (detection limit) and 0.026 µg L−1 (determination limit) for Pb. The method offers good precisions (RSD

中文翻译：

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磁分散固相萃取同时富集环境水样中的镉和铅

摘要 一种新的磁分散固相萃取 (MDSPE) 方法和石墨炉原子吸收光谱法 (GFAAS) 相结合，用于同时富集包括海水在内的环境水样中的 Cd 和 Pb，并随后对两种分析物进行顺序测定。对于预浓缩，合成并表征了壳结构的 Fe3O4@氧化石墨烯纳米球。这种纳米吸附剂的接触面积大，极性基团的表面密度高。使用优化方法，实验检测限和测定限，计算为分析物浓度分别相当于空白标准偏差的 3 倍和 10 倍，加上空白净强度，为 0.005 µg L-1（检测限） ) 和 Cd 的 0.017 µg L-1（测定限）；和 0。Pb 的浓度为 008 µg L-1（检测限）和 0.026 µg L-1（测定限）。该方法提供了良好的精密度 (RSD