Simultaneous determination of Cd and Pb in antibiotics used in sugar-cane fermentation process by GFAAS
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
27/05/2014
27/05/2014
12/09/2006
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Resumo |
A method has been developed for the simultaneous determination of Cd and Pb in antibiotics used in sugar-cane fermentation by GFAAS. The integrated platform of transversely heated graphite atomizer was treated with tungsten to form a coating of tungsten carbide. Six samples of commercial solid antibiotics were analyzed by injecting 20 μL of digested samples into the pretreated graphite platform with co-injection of 5 μL of 1000 mg L-1 Pd as chemical modifier. Samples were mineralized in a closed-vessel microwave-assisted acid-digestion system using nitric acid plus hydrogen peroxide. The pyrolysis and atomization temperatures of the heating program of the atomizer were selected as 600°C and 2200°C, respectively. The calculated characteristic mass for Cd and Pb was 1.6 pg and 42 pg, respectively. Limits of detection (LOD) based on integrated absorbance were 0.02 μg L -1 Cd and 0.7 μg L-1 Pb and the relative standard deviations (n = 10) for Cd and Pb were 5.7% and 8.0%, respectively. The recoveries of Cd and Pb added to the digested samples varied from 91% to 125% (Cd) and 80% to 112% (Pb). |
Formato |
7-12 |
Identificador |
http://dx.doi.org/10.1590/S0100-46702006000200001 Ecletica Quimica, v. 31, n. 2, p. 7-12, 2006. 0100-4670 http://hdl.handle.net/11449/69087 10.1590/S0100-46702006000200001 S0100-46702006000200001 2-s2.0-33748358911 2-s2.0-33748358911.pdf |
Idioma(s) |
eng |
Relação |
Eclética Química |
Direitos |
openAccess |
Palavras-Chave | #Antibiotic #Cadmium #GFAAS #Lead #Permanent modifier |
Tipo |
info:eu-repo/semantics/article |