Abstract The main objective of this study was to develop an ultrasound-assisted dispersive solid-phase microextraction (UADSPME) method for separation and preconcentration of tellurium (Te) and thallium (Tl) in environmental samples prior to inductively coupled plasma-optical emission spectrometry determination. The MPC@SiO2@Fe3O4 nanocomposite was used as a nanoadsorbent in the UADSPME method. The nanocomposite was prepared using a coprecipitation and sol–gel method, and it was characterized using scanning electron microscopy/energy-dispersive X-ray spectroscopy, transmission electron microscopy and X-ray powder diffraction techniques. The Box–Behnken design and response surface methodology were used for the optimization of experimental parameters (such as pH, extraction time and mass of adsorbent) affecting the preconcentration procedure. Under optimized conditions, the limits of detection were 0.05 and 0.02 µg L−1 and the limits of quantification were 0.17 and 0.07 µg L−1 for Te and Tl, respectively. The precision expressed as the relative standard deviation (%RSD) was 2.5% and 2.8% for Te and Tl, respectively. Finally, the developed method was applied for the analysis of Tl and Te in real samples.

中文翻译：

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基于二氧化硅@氧化铁纳米复合材料包覆的介孔碳的超声辅助分散固相微萃取用于天然水系统中Te和Tl的预浓缩

摘要 本研究的主要目的是开发一种超声辅助分散固相微萃取 (UADSPME) 方法，用于在电感耦合等离子体发射光谱法测定之前分离和预浓缩环境样品中的碲 (Te) 和铊 (Tl)。 . MPC@SiO2@Fe3O4纳米复合材料在UADSPME方法中用作纳米吸附剂。采用共沉淀和溶胶-凝胶法制备纳米复合材料，并使用扫描电子显微镜/能量色散 X 射线光谱、透射电子显微镜和 X 射线粉末衍射技术对其进行表征。Box-Behnken 设计和响应面方法用于优化影响预浓缩过程的实验参数（如 pH 值、提取时间和吸附剂质量）。在优化条件下，Te 和 Tl 的检测限分别为 0.05 和 0.02 µg L-1，定量限分别为 0.17 和 0.07 µg L-1。对于 Te 和 Tl，以相对标准偏差 (%RSD) 表示的精密度分别为 2.5% 和 2.8%。最后，将开发的方法应用于实际样品中 Tl 和 Te 的分析。