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Ultrasound assisted-dispersive-modification solid-phase extraction using task-specific ionic liquid immobilized on multiwall carbon nanotubes for speciation and determination mercury in water samples
Microchemical Journal ( IF 4.8 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.microc.2020.104632
Nafiseh Esmaeili , Jamshid Rakhtshah , Eskandar Kolvari , Hamid Shirkhanloo

Abstract An efficient method based on 1-(3-aminopropyl)-3-methylimidazolium hexafluorophosphate (TSIL) immobilized on multiwall carbon nanotubes (MWCNTs@ [Apmim][PF6]) was used for speciation of inorganic/organic mercury (Hg2+, R-Hg or O-Hg) by ultrasound assisted-dispersive modification solid-phase extraction (UAS-DM-SPE) which was combined with cold vapor atomic absorption spectrometry (CV-AAS). The mixture of MWCNTs @ [Apmim][PF6] in acetone was injected to water samples in polypropylene syringe filters (PSF) which was already adjusted pH up to 8.5. After shaking, the Hg(II) and O-Hg were simply extracted on amine group of [Apmim][PF6] as TSIL and then, separated from the liquid phase by pushing plunger of PSF. The Hg(II) and O-Hg loaded in MWCNTs @ [Apmim][PF6] were back-extracted based on the eluent solution (HNO3, 0.5 mL, 0.2 mol L−1) with/without microwave system (UV radiation at 165 °C). Finally, the concentration of mercury was determined by CV-AAS. By microwave, organic mercury species in remained solution were changed to Hg (II) and the total amount of mercury (T-Hg) was determined. Finally, O-Hg concentration was computed by subtracting the Hg (II) concentration from T-Hg. Under the optimized conditions, the linear range, LOD and enrichment factor for Hg (II) and O-Hg were achieved (0.02–3.6 μg L−1; 0.02–3.4 μg L−1), (5.2 ng L−1; 5.8 ng L−1) and (19.9; 19.7), respectively (Mean of RSD

中文翻译:

使用固定在多壁碳纳米管上的特定任务离子液体进行超声辅助分散改性固相萃取,用于水样中的汞的形态形成和测定

摘要 一种基于固定在多壁碳纳米管 (MWCNTs@[Apmim][PF6]) 上的 1-(3-氨基丙基)-3-甲基咪唑鎓六氟磷酸盐 (TSIL) 的有效方法用于无机/有机汞 (Hg2+, R- Hg 或 O-Hg) 通过超声辅助分散改性固相萃取 (UAS-DM-SPE) 结合冷蒸气原子吸收光谱法 (CV-AAS)。将 MWCNT@[Apmim][PF6] 在丙酮中的混合物注入到聚丙烯注射式过滤器 (PSF) 中的水样中,该过滤器的 pH 值已调至 8.5。振荡后,Hg(II)和O-Hg在[Apmim][PF6]的胺基上被简单地提取为TSIL,然后通过推动PSF柱塞从液相中分离。装载在 MWCNTs @ [Apmim][PF6] 中的 Hg(II) 和 O-Hg 基于洗脱液(HNO3,0.5 mL,0. 2 mol L−1) 带/不带微波系统(165 °C 下的紫外线辐射)。最后,通过 CV-AAS 测定汞的浓度。通过微波,将残留溶液中的有机汞物质转变为汞(II)并测定汞的总量(T-Hg)。最后,通过从 T-Hg 中减去 Hg (II) 浓度来计算 O-Hg 浓度。在优化条件下,实现了 Hg (II) 和 O-Hg 的线性范围、LOD 和富集因子(0.02-3.6 μg L-1;0.02-3.4 μg L-1),(5.2 ng L-1;5.8 ng L−1) 和 (19.9; 19.7) 分别(RSD 的平均值 O-Hg 浓度是通过从 T-Hg 中减去 Hg (II) 浓度来计算的。在优化条件下,实现了 Hg (II) 和 O-Hg 的线性范围、LOD 和富集因子(0.02-3.6 μg L-1;0.02-3.4 μg L-1),(5.2 ng L-1;5.8 ng L−1) 和 (19.9; 19.7) 分别(RSD 的平均值 O-Hg 浓度是通过从 T-Hg 中减去 Hg (II) 浓度来计算的。在优化条件下,实现了 Hg (II) 和 O-Hg 的线性范围、LOD 和富集因子(0.02-3.6 μg L-1;0.02-3.4 μg L-1),(5.2 ng L-1;5.8 ng L−1) 和 (19.9; 19.7) 分别(RSD 的平均值
更新日期:2020-05-01
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