In this study, a vortex-assisted switchable solvent microextraction (VA-SSME) method was developed for the determination of iron by slotted quartz tube flame atomic absorption spectrometry (SQT-FAAS). A ligand synthesized from the reaction of ortho-phenylenediamine and 5-bromosalicylaldehyde was used to form a coordinate complex of iron. All experimental variables such as switchable solvent amount, sodium hydroxide concentration, sodium hydroxide amount, and diluent amount were optimized to increase extraction efficiency for the iron complex. Optimum conditions were applied to aqueous standard solutions in the range of 20–750 ng/mL, and the percent relative standard deviation (%RSD) was less than 2.0%. The limit of detection (LOD) and limit of quantification (LOQ) were determined as 4.8 and 16.2 ng/mL, respectively. The optimized method recorded approximately 53 times enhancement according to the conventional FAAS system. The proposed method was applied to mineral spring water samples, and satisfactory percent recovery results (100–105%) were obtained for iron, indicating good applicability in addition to high accuracy.

中文翻译：

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槽石英管火焰原子吸收分光光度法测定矿泉水样品中铁的简单，绿色涡旋辅助可转换溶剂微萃取方法

在这项研究中，开发了涡流辅助可转换溶剂微萃取（VA-SSME）方法，用于通过缝隙石英管火焰原子吸收光谱法（SQT-FAAS）测定铁。由邻苯二胺和5-溴水杨醛反应合成的配体用于形成铁的配位络合物。优化所有实验变量，例如可转换的溶剂量，氢氧化钠浓度，氢氧化钠量和稀释剂量，以提高铁络合物的萃取效率。最佳条件适用于20–750 ng / mL的标准水溶液，相对标准偏差百分比（％RSD）小于2.0％。检测限（LOD）和定量限（LOQ）分别确定为4.8和16.2 ng / mL。根据常规FAAS系统，优化方法记录了约53倍的增强。所提出的方法应用于矿泉水样品，铁的回收率百分比令人满意（100–105％），表明除高准确性外还具有良好的适用性。