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Ionic Liquid-Based, Single-Drop Microextraction for Preconcentration of Cobalt Before Its Determination by Electrothermal Atomic Absorption Spectrometry

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An effective and environmentally friendly single-drop microextraction method was developed for the preconcentration of ultratraces of cobalt before its determination by electrothermal atomic absorption spectrometry (ETAAS). A microdrop of 1-hexyl-3-methylimidazolium hexafluorophosphate, [C6MIM][PF6], was used to extract Co(II) ions as an ammonium pyrroldinedithiocarbamate (APDC) complex. The sensitivity was improved by increasing the volume of the suspended drop. Several variables affecting microextraction efficiency and the ETAAS signalsuch as pyrolysis and atomization temperature, pH, APDC concentration, extraction time, drop volume, and stirring ratewere investigated and optimized. Under the optimum experimental conditions, the detection limit (3 SD) was 0.04 g/L, and the enrichment factor was 120. The RSD for five replicate determinations of Co(II) at 0.5 g/L was 4.5. The developed method was validated by analysis of a Standard Reference Material and applied to the determination of cobalt in water samples.
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Document Type: Research Article

Affiliations: University of Tabriz, Center of Excellence for New Materials and Clean Chemistry, Faculty of Chemistry, Tabriz, Iran.

Publication date: May 1, 2010

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  • The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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