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http://acervodigital.unesp.br/handle/11449/67792
- Title:
- Determination of cadmium in river water samples by flame AAS after on-line preconcentration in mini-column packed with 2-aminothiazole-modified silica gel
- Universidade Estadual Paulista (UNESP)
- Universidade Estadual do Maranhão (UEMA)
- 0910-6340
- A rapid and sensitive method was developed to determine trace levels of Cd2+ ions in an aqueous medium by flame atomic absorption spectrometry, using on-line preconcentration in a mini-column packed with 100 mg of 2-aminothiazol modified silica gel (SiAT). The Cd2+ ions were sorbed at pH 5.0. The preconcentrated Cd2+ ions were directly eluted from the column to the spectrometer's nebulizer-burner system using 100 μL of 2 mol L-1 hydrochloric acid. A retention efficiency of over 95% was achieved. The enrichment factor (calculated as the ratio of slopes of the calibration graphs) obtained with preconcentrations in a mini-column packed with SiAT (A = -1.3 × 10-3 + 1.8 × 10-3 [Cd2+]) and without preconcentrations (A = 4 × 10-5 + 3.5 × 10-3[Cd2+]), was 51 and the detection limit calculated was 0.38 μg L-1. The preconcentration procedure was applied to determine trace levels of Cd in river water samples. The optimum preconcentration conditions are discussed herein.
- 1-Jul-2004
- Analytical Sciences, v. 20, n. 7, p. 1029-1032, 2004.
- 1029-1032
- 2 aminothiazole derivative
- cadmium
- hydrochloric acid
- river water
- silica gel
- adsorption
- aqueous solution
- atomic absorption spectrometry
- calibration
- combustion
- concentration (parameters)
- elution
- flame atomic absorption spectrometry
- nebulizer
- online system
- pH
- sensitivity and specificity
- water sampling
- Cadmium
- Calibration
- Hydrochloric Acid
- Hydrogen-Ion Concentration
- Ions
- Models, Chemical
- Silicon Dioxide
- Spectrophotometry
- Spectrophotometry, Atomic
- Spectrophotometry, Infrared
- Thiazoles
- Time Factors
- Water
- http://dx.doi.org/10.2116/analsci.20.1029
- Acesso aberto
- outro
- http://repositorio.unesp.br/handle/11449/67792
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