This paper reports a new approach for the simultaneous extraction of individual analytes based on the simultaneous application of multiple magnetic sorbents using a simple automated system. A mixture of toxic metals including Cd(II) and Cr(III) was selected as model analytes and two selective magnetic nano-sorbents were prepared for each analyte by modification of Fe₃O₄ nanoparticles with specific ligands cadion and ferron, respectively. The prepared sorbents were held using an external magnet in two parts of a loop. The sample solution was then passed through the loop leading to selective extraction of each analyte on the specified sorbent. Finally, the two sections of the loop were separated and each analyte was separately eluted and quantified using graphite furnace atomic absorption spectrometry. The factors affecting the designed system and the extraction efficiency were investigated and optimized. A preconcentration factor of 80 and detection limits of 0.7 and 6.8 ng L⁻¹ were achieved for Cd(II) and Cr(III), respectively. The method was successfully applied to the simultaneous extraction and determination of the target analytes in natural water samples.

中文翻译：

---

同时应用多种磁性吸附剂的同时提取单个分析物的新方法

本文报告了一种使用简单的自动化系统同时应用多种磁性吸附剂的同时提取单个分析物的新方法。选择包括Cd（II）和Cr（III）在内的有毒金属混合物作为模型分析物，并通过修饰Fe ₃ O ₄为每种分析物制备两种选择性磁性纳米吸附剂具有特定配体镉和铁的纳米粒子。使用外部磁体将准备好的吸附剂固定在回路的两个部分中。然后将样品溶液通过定量环，以选择性萃取指定吸附剂上的每种分析物。最后，将回路的两个部分分开，并使用石墨炉原子吸收光谱法分别洗脱和定量每种分析物。研究和优化了影响设计系统和提取效率的因素。Cd（II）和Cr（III）的预浓系数为80，检出限为0.7和6.8 ng L ^-1）， 分别。该方法已成功应用于天然水样品中目标分析物的同时提取和测定。