Abstract A solid phase microextraction (SPME) method combined with slotted quartz tube-flame atomic absorption spectrometry (SQT-FAAS) was developed and optimized for the extraction and the determination of trace indium in different matrices. The method relies upon SPME that uses oleic acid coated magnetite nanoparticles (MNPs) followed by analysis with SQT mounted FAAS. After the enhancement in sensitivity by means of SPME, further improvement in sensitivity was provided by SQT which improves the detection power of conventional FAAS. The easy separation of extracted indium from the media was facilitated using an external magnetic field. Some effective parameters on the development of the method such as pH of the analyte solution, amount of eluent, amount of MNPs were optimized to obtain maximum absorbance value at each optimization step in order to achieve an improved detection power. Under the optimum experimental and instrumental conditions, the enhancement factor of 44 was obtained where the limit of detection and the limit of quantification were found to be 6.02 μg/L and 20.06 μg/L, respectively. Recovery tests were also studied in order to demonstrate the accuracy of the developed analytical method and satisfactory outcomes were obtained.

中文翻译：

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基于油酸包覆磁性纳米粒子的涡旋辅助固相微萃取结合开槽石英管-火焰原子吸收光谱法测定铟

摘要 开发并优化了固相微萃取(SPME) 与开槽石英管火焰原子吸收光谱(SQT-FAAS) 相结合的方法，用于萃取和测定不同基质中的痕量铟。该方法依赖于使用油酸包覆磁铁矿纳米粒子 (MNP) 的 SPME，然后使用安装在 SQT 上的 FAAS 进行分析。在通过 SPME 提高灵敏度后，SQT 进一步提高了灵敏度，从而提高了常规 FAAS 的检测能力。使用外部磁场有助于从介质中轻松分离提取的铟。一些有关方法开发的有效参数，例如分析物溶液的 pH 值、洗脱液的量、优化 MNP 的数量以获得每个优化步骤中的最大吸光度值，以提高检测能力。在最佳实验和仪器条件下，得到的增强因子为 44，其中检测限和定量限分别为 6.02 μg/L 和 20.06 μg/L。还研究了回收率测试，以证明所开发的分析方法的准确性并获得了令人满意的结果。