Highly selective ionic liquid-based microextraction method for sensitive trace cobalt determination in environmental and biological samples |
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Authors: | Paula Berton |
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Institution: | a Analytical Chemistry Research and Development Group (QUIANID), (LISAMEN - CCT - CONICET - Mendoza), Av. Ruiz Leal S/N Parque General San Martín, M 5502 IRA Mendoza, Argentina b Instituto de Ciencias Básicas, Universidad Nacional de Cuyo, Mendoza, Argentina |
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Abstract: | A simple and rapid dispersive liquid-liquid microextraction procedure based on an ionic liquid (IL-DLLME) was developed for selective determination of cobalt (Co) with electrothermal atomic absorption spectrometry (ETAAS) detection. Cobalt was initially complexed with 1-nitroso-2-naphtol (1N2N) reagent at pH 4.0. The IL-DLLME procedure was then performed by using a few microliters of the room temperature ionic liquid (RTIL) 1-hexyl-3-methylimidazolium hexafluorophosphate C6mim]PF6] as extractant while methanol was the dispersant solvent. After microextraction procedure, the Co-enriched RTIL phase was solubilized in methanol and directly injected into the graphite furnace. The effect of several variables on Co-1N2N complex formation, extraction with the dispersed RTIL phase, and analyte detection with ETAAS, was carefully studied in this work. An enrichment factor of 120 was obtained with only 6 mL of sample solution and under optimal experimental conditions. The resultant limit of detection (LOD) was 3.8 ng L−1, while the relative standard deviation (RSD) was 3.4% (at 1 μg L−1 Co level and n = 10), calculated from the peak height of absorbance signals. The accuracy of the proposed methodology was tested by analysis of a certified reference material. The method was successfully applied for the determination of Co in environmental and biological samples. |
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Keywords: | 1-Hexyl-3-methylimidazolium hexafluorophosphate Room temperature ionic liquid Microextraction Cobalt Environmental and biological samples |
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