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Supramolecular–based dispersive liquid–liquid microextraction: A novel sample preparation technique for determination of inorganic species

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Abstract

A new simple and sensitive method has been developed for the determination of trace levels of inorganic species in environmental water samples. It is based on the use of supramolecular–based dispersive liquid–liquid microextraction (SM–DLLME) prior to microsample introduction into FAAS. The ions are micro–extracted with coacervates composed of reverse micelles made from decanoic acid and dispersed in tetrahydrofuran–water mixtures. Cobalt ion was used as a model ion, and 1– (2–pyridylazo)–2–naphthol as the complexing agent. SM–DLLME results from a combination of DLLME with coacervation–based microextraction. It combines the advantages of DLLME with those of preconcentration based on coacervation and reverse micelles. Factors affecting the extraction efficiency of Co and its subsequent determination by FAAS were optimized. Under the optimized conditions and using 5.00 mL sample only, the enhancement factor is 58, the limit of detection is 4.2 μg L–1, and the relative standard deviations for 100 μg L–1 and 30 μg L–1 of Co are 2.1% and 3.8%, respectively (n = 6). The accuracy of the method was confirmed by parallel analyses using the ASTM reference method.

Schematic representation SM–DLLME enrichment method (Supramolecular assemblies were hired as extraction media in dispersive liquid–liquid microextraction. This method is based on microextraction of analytes with coacervates made up of decanoic acid reverse micelles dispersed in tetrahydrofuran (THF)–water. Hazardous organic solvents as the microextraction solvent were avoided)

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Authors and Affiliations

  1. Department of Analytical Chemistry, Faculty of Chemistry, University College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran

    Sanaz Jafarvand & Farzaneh Shemirani

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  1. Sanaz Jafarvand
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  2. Farzaneh Shemirani
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Correspondence to Farzaneh Shemirani.

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Jafarvand, S., Shemirani, F. Supramolecular–based dispersive liquid–liquid microextraction: A novel sample preparation technique for determination of inorganic species. Microchim Acta 173, 353–359 (2011). https://doi.org/10.1007/s00604-011-0564-9

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  • DOI: https://doi.org/10.1007/s00604-011-0564-9

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