Open AccessEvaluation of dispersive liquid-liquid microextraction for the determination of cobalt and cadmium by flame atomic absorption spectrometry: application in water and food samples
Author(s) -
C. Bosch Ojeda,
F. Sánchez Rojas
Publication year - 2014
Publication title -
sample preparation
Language(s) - English
Resource type - Journals
ISSN - 2299-677X
DOI - 10.2478/sampre-2014-0002
Subject(s) - cadmium , cobalt , solvent , extraction (chemistry) , atomic absorption spectroscopy , chemistry , volume (thermodynamics) , detection limit , chromatography , absorption (acoustics) , chelation , analytical chemistry (journal) , materials science , inorganic chemistry , organic chemistry , physics , quantum mechanics , composite material
Dispersive liquid-liquid microextraction (DLLME)was applied to the separation and preconcentration of Cd(II)and Co(II) from water and food samples. The influence ofthe following analytical parameters on the quantitativerecoveries of cadmium and cobalt were investigated: pH,extraction solvent volume, dispersing solvent volume andtype, and concentration of chelating agent. Under theoptimized conditions, the detection limits were 2 μg L-1 and13 μg L-1 for Cd(II) and Co(II), respectively. The proposedmethod was validated by the analysis of certified samplesand has been applied to the determination of these ions inenvironmental water samples, with recoveries of 98 – 101%for Co(II) and 94 – 120% for Cd(II). In food samples therecoveries fell between 100 – 110% and 101-120% for Co(II)and Cd(II), respectively