Abstract
A new method for the determination of cobalt was developed by dispersive liquid-liquid microextraction preconcentra-tion and flame atomic absorption spectrometry. In the proposed approach, 1,5-bis(di-2-pyridyl) methylene thiocarbohydrazide (DPTH) was used as a chelating agent, and chloroform and ethanol were selected as extraction and dispersive solvents. Some factors influencing the extraction efficiency of cobalt and its subsequent determination, including extraction and dispersive solvent type and volume, pH of sample solution, concentration of the chelating agent, and extraction time, were studied and optimized. Under the optimum conditions, a preconcentration factor of 8 was reached. The detection limit for cobalt was 12.4 ng?mL–1, and the relative standard deviation (RSD) was 3.42% (n = 7, c = 100 ng?mL–1). The method was successfully applied to the determination of cobalt in food, environmental and water samples.
Highlights
Heavy metal ions are toxic, non-biodegradable, and tend to be accumulated in vital human organs, where they can act progressively over a long period through food chains
A new method for the determination of cobalt was developed by dispersive liquid-liquid microextraction preconcentration and flame atomic absorption spectrometry
The quantification of metal species in various matrices has been performed by different techniques, including flame atomic absorption spectrometry (FAAS) [4], graphite furnace atomic absorption spectrometry (GFAAS) [5] and inductively coupled plasma optical emission spectrometry (ICP-OES) [6], among others
Summary
Heavy metal ions are toxic, non-biodegradable, and tend to be accumulated in vital human organs, where they can act progressively over a long period through food chains. The quantification of metal species in various matrices has been performed by different techniques, including flame atomic absorption spectrometry (FAAS) [4], graphite furnace atomic absorption spectrometry (GFAAS) [5] and inductively coupled plasma optical emission spectrometry (ICP-OES) [6], among others. In recent decades the developments of preconcentration steps prior to analytical determinations of trace level compounds have been explored in considerable depth. The cloudy state results form the formation of fine droplets of the extraction solvent, which disperse in the sample solution. This cloudy solution shall be centrifuged and the fine droplets sediment at the bottom of the conical test tube. The aim of present work was to develop a DLLME procedure combined with FAAS for cobalt determination, using 1,5-bis (di-2-pyridylmethylene) thiocarbonohydrazide (DPTH) as chelating reagent
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