Abstract
A sensitive and selective preconcentration method has been developed for copper(II) using modified sawdust as an adsorbent. Sawdust was chemically modified with diethylenetriamine. Copper as CuCl42- was retained by the adsorbent in the column, eluted by nitric acid and subsequently determined by flame atomic absorption spectrometer. The effect of pH, chloride concentration, volume of the sample and diverse ions on the recovery of the analyte was investigated. A preconcentration factor of 250 was achieved using optimum conditions. The calibration graph was linear in the range 1-150 ng mL-1 copper in the initial solution. The detection limit (3Sb) was 0.2 ng mL-1 and the relative standard deviations were 2.7 and 1.2% for 5 and 50 ng mL-1 respectively (n = 10). It was revealed that after ten cycles of adsorption and desorption, the adsorbent retained its promising adsorption ability. The method was successfully applied to the determination of copper(II) in different water samples. Obtained results showed that the developed method is relatively simple, accurate, sensitive and selective. KEY WORDS: Copper(II), Preconcentration, Modified sawdust Bull. Chem. Soc. Ethiop. 2014, 28(3), 321-328.DOI: http://dx.doi.org/10.4314/bcse.v28i3.1
Highlights
The determination of metal ions in some natural samples such as waters, soils and biological fluids is a very important part of environmental and public health studies, but direct determination with various instrumental methods is not possible owing to the matrix effect and the low concentration of metal ions in a sample
Among the various preconcentration techniques, solid phase extraction (SPE) techniques are widely used for the determination of trace metal ions in aqueous samples, because of high preconcentration factor to obtain in short time, low consumption of reagent, simple to operate; and the ability of combination with different detection techniques [2, 3]
Copper as CuCl42- is preconcentrated by adsorption on modified sawdust adsorbent, eluted by nitric acid and determined by flame atomic absorption spectrometer (FAAS)
Summary
The determination of metal ions in some natural samples such as waters, soils and biological fluids is a very important part of environmental and public health studies, but direct determination with various instrumental methods is not possible owing to the matrix effect and the low concentration of metal ions in a sample. This study reports the sensitive and highly selective preconcentration method for the determination of copper(II). Copper as CuCl42- is preconcentrated by adsorption on modified sawdust adsorbent, eluted by nitric acid and determined by flame atomic absorption spectrometer (FAAS). The preliminary experimental observations showed that copper(II), as chloride complex, CuCl42- is adsorbed on diethylenetriamine-sawdust by forming an ion pair with ammonium groups eluted from the column by nitric acid solution, while the sawdust did not have this ability.
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