ISFME extraction of As species from some real water samples using an imidazolium-based task-specific ionic liquid (TSIL): Synthesis and characterization

• Published in: Separation science and technology 2024-03, Vol.59 (4), p.580-591
• Main Authors: Hosseini, Mehdi, Khoshfetrat, Seyyed Mehdi, Panahimehr, Mohammad, Rezaei, Aram
• Format: Article
• Language: English
• Subjects: Absorption spectroscopy; Ammonium; Ammonium compounds; Anion exchange; Anion exchanging; Anions; Arsenic; arsenic speciation; Atomic absorption spectroscopy; Chelates; Chelating agents; Chelation; electrothermal atomic absorption; Hydrophobicity; Ionic liquids; Pyrrolidine; Pyrrolidine dithiocarbamate; Reducing agents; solvent-based microextraction; Solvents; Spectral analysis; Spectrometry; Synthesis; synthesis and characterization; Task-specific ionic liquid; Water analysis; Water sampling
• ISSN: 0149-6395; 1520-5754
• DOI: 10.1080/01496395.2024.2328678

To determine of arsenic species in real water samples using electrothermal atomic absorption spectrometry, a high-performance in-situ solvent formation microextraction technique has been developed using homogenous liquid - liquid microextraction concepts. The developed method was based on the use of a synthesized imidazolium-based ionic liquid (IL) modified with ammonium pyrrolidine dithiocarbamate as a task-specific ionic liquid (TSIL), which was chelated with As(III) and then converted to a hydrophobic IL using ammonium hexafluorophosphate in anion exchange reactions. As(V) was reduced to As(III), using a satisfied reducing agent, and the total amount of As was analyzed using ETAAS. TSIL acts simultaneously as an extracting solvent and a chelating agent. The characterization of the synthesized TSIL was performed using 13 CNMR and FTIR analyses. When optimal conditions were met, linear dynamic ranges of 0.5-50 µg/L and 0.5-20 µg/L were obtained in the determination of As(III) and total As, respectively. The limits of detection (LOD) and quantitation (LOQ) were determined to be 0.021 µg/Land 0.064 µg/L for the determination of As(III) (for concentration 20 µg/L), respectively, and the standard deviation (RSD%, n = 7) was 2.0%. To evaluate the validity of the method, it was successfully applied for As species determination in different real water samples.