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Highly selective ionic liquid-based microextraction method for sensitive trace cobalt determination in environmental

Paula Berton¹, Rodolfo G Wuilloud

¹Analytical Chemistry Research and Development Group (QUIANID), (LISAMEN-CCT-CONICET-Mendoza), Av. Ruiz Leal S/N Parque General San Martín, M 5502 IRA Mendoza, Argentina.

Analytica Chimica Acta

|February 23, 2010

Summary

This summary is machine-generated.

A new ionic liquid-based dispersive liquid-liquid microextraction (IL-DLLME) method enables selective cobalt (Co) determination using electrothermal atomic absorption spectrometry (ETAAS). This rapid technique achieves high enrichment factors for analyzing Co in environmental and biological samples.

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Area of Science:

Analytical Chemistry
Environmental Chemistry
Spectroscopy

Background:

Accurate determination of cobalt (Co) is crucial for environmental and biological monitoring.
Traditional methods for Co analysis can be time-consuming and require large sample volumes.
Development of sensitive and selective extraction techniques is needed for trace metal analysis.

Purpose of the Study:

To develop a simple, rapid, and selective method for cobalt determination.
To utilize ionic liquid-based dispersive liquid-liquid microextraction (IL-DLLME) for enhanced Co preconcentration.
To apply the method for the analysis of cobalt in complex environmental and biological matrices.

Main Methods:

Ionic liquid-based dispersive liquid-liquid microextraction (IL-DLLME) using 1-hexyl-3-methylimidazolium hexafluorophosphate ([C(6)mim][PF(6)]).
Complexation of cobalt with 1-nitroso-2-naphtol (1N2N) at pH 4.0.
Detection of cobalt using electrothermal atomic absorption spectrometry (ETAAS).

Main Results:

An enrichment factor of 120 was achieved with a 6 mL sample volume.
A low limit of detection (LOD) of 3.8 ng L(-1) was obtained.
The method demonstrated good precision with a relative standard deviation (RSD) of 3.4%.

Conclusions:

The developed IL-DLLME method is effective for selective and sensitive determination of cobalt.
The method is accurate, as validated by certified reference material analysis.
The technique is suitable for the determination of cobalt in real-world environmental and biological samples.