Ionic liquid-based air-assisted liquid–liquid microextraction combined with dispersive micro-solid phase extraction for the preconcentration of copper in water samples,Analytical Methods

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Ionic liquid-based air-assisted liquid–liquid microextraction combined with dispersive micro-solid phase extraction for the preconcentration of copper in water samples
Analytical Methods ( IF 2.7 ) Pub Date : 2018-05-24 00:00:00 , DOI: 10.1039/c8ay00800k
Weimin Du _{1,

2,

3} , Li Yao _{3,

4,

5,

6} , Jianfeng Bian _{1,

2,

3} , Yang Liu _{1,

2,

3} , Xie Wang _{3,

4,

5,

6} , Jianhua Zhang _{3,

4,

5,

6} , Liangyu Pang _{3,

4,

5,

6}

Affiliation

Ionic liquid-based air-assisted liquid–liquid microextraction (IL-AALLME) combined with dispersive micro-solid phase extraction (D-μ-SPE) was applied for the extraction and preconcentration of Cu prior to analysis by graphite furnace atomic absorption spectrometry. IL [Hmim][PF₆] was used as the extractant, non-ionic surfactant Triton X-100 as the emulsifier and Fe₃O₄ nanoparticles as the sorbent. The emulsion was rapidly formed by pulling in and pushing out the mixture of aqueous sample solution and extraction solvent repeatedly using a 10 mL glass syringe. Then, the extractant phase was mixed with Fe₃O₄ magnetic nanoparticles and separated using a magnet. As a result, the conventional tedious procedure associated with AALLME such as centrifugation was eliminated and the analytical process was accelerated. The experimental parameters affecting the extraction efficiency of Cu such as pH, IL volume, Triton X-100 concentration, Fe₃O₄ amount, number of extraction times and ultrasound time were investigated and optimized. Under the optimal conditions, the calibration curve was linear in the range of 1.5–120 ng mL⁻¹ for Cu with a correlation coefficient (R) of 0.9992. The limit of detection was 0.5 ng mL⁻¹. Finally, the applicability of this newly developed method was investigated for the analysis of Cu in real water samples.

中文翻译：

离子液基空气辅助液液微萃取与分散微固相萃取相结合用于水样品中铜的预富集

离子液体基空气辅助液-液微萃取（IL-AALLME）与分散微固相萃取（D-μ-SPE）结合使用，然后通过石墨炉原子吸收光谱分析进行铜的萃取和预浓缩。使用IL [Hmim] [PF ₆ ]作为萃取剂，使用非离子表面活性剂Triton X-100作为乳化剂，并使用Fe ₃ O ₄纳米颗粒作为吸附剂。通过使用10 mL玻璃注射器反复引入和推出样品水溶液和萃取溶剂的混合物来快速形成乳液。然后，将萃取相与Fe ₃ O ₄混合磁性纳米粒子，并用磁铁分离。结果，消除了与AALLME相关的常规繁琐程序（例如离心），并加快了分析过程。研究和优化了影响铜提取效率的实验参数，如pH，IL体积，Triton X-100浓度，Fe ₃ O ₄含量，提取次数和超声时间。在最佳条件下，Cu的校准曲线在1.5–120 ng mL ^-1范围内呈线性，相关系数（R）为0.9992。检测下限为0.5 ng mL ^-1。最后，研究了这种新开发的方法在实际水样中分析铜的适用性。

更新日期：2018-05-24

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