采用功能化离子液体原位分散液液微萃取原子吸收光谱法测定砷形态。
Determination of arsenic species using functionalized ionic liquid by in situ dispersive liquid-liquid microextraction followed by atomic absorption spectrometry.
机构信息
Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran; Faculty of Pharmacy, Baqiyatallah University of Medical Sciences, Tehran, Iran.
Department of Chemistry, Faculty of Basic Sciences, Imam Hossein University, Tehran, Iran.
出版信息
Food Chem. 2021 Jul 1;349:129115. doi: 10.1016/j.foodchem.2021.129115. Epub 2021 Jan 14.
Synthesis and application of a task-specific ionic liquids (TSILs) as extracting solvents or chelating agents in dispersive liquid-liquid micro-extraction (DLLME) was evaluated. The developed method was based on the use of an ammonium pyrrolidine dithiocarbamate (APDC) bonded ionic liquid for chelation with As(III), followed by conversion of the As(III) chelated TSIL to a hydrophobic ionic liquid using KPF as an anion-exchange reagent. As(V) was reduced to As(III), using a 2/1 w/w blend of KI and NaSO and then the total amount of As was measured through ETAAS analysis. Under optimal conditions, linear dynamic ranges of 0.2-15 ng mL and 0.2-20 ng mL were observed in the determination of As(III) and total As respectively. The relative standard deviations (RSD%, n = 5) for the determination of As(III) (10 ng mL) was 3.2% and the limits of detection and quantitation were determined to be 0.01 ng mL and 0.0.034 ng mL; respectively.
评价了将特定任务离子液体（TSILs）作为萃取溶剂或螯合剂在分散液液微萃取（DLLME）中的合成与应用。所开发的方法基于使用铵基吡咯烷二硫代氨基甲酸盐（APDC）键合离子液体与 As（III）螯合，然后使用 KPF 作为阴离子交换试剂将 As（III）螯合的 TSIL 转化为疏水性离子液体。使用 2/1 w/w 混合的 KI 和 NaSO 将 As(V)还原为 As(III)，然后通过 ETAAS 分析测定总 As 的含量。在最佳条件下，测定 As(III)的线性动态范围为 0.2-15 ng mL，测定总 As 的线性动态范围为 0.2-20 ng mL。测定 10 ng mL 的 As(III)的相对标准偏差（RSD%，n = 5）为 3.2%，检出限和定量限分别为 0.01 ng mL 和 0.0.034 ng mL。
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