Journal
FOOD CHEMISTRY
Volume 221, Issue -, Pages 907-912Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.11.075
Keywords
Cadmium determination; Dispersive liquid-liquid microextraction; Graphite furnace atomic absorption spectrometry; Lead determination; Soft drinks
Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul (FAPERGS)
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A DLLME method for extraction and preconcentration of Cd and Pb from soft drinks and further determination by GF AAS was developed. Important parameters of DLLME such as the type and volume of dispersive and extraction solvents, concentration of DDTC (complexing agent) and pH were evaluated. Better results were obtained using 500 mu L of acetone for Cd and 700 mu L of acetonitrile for Pb as dispersive solvents, 60 mu L of CCl4 as extraction solvent for both analytes and 500 mu L of 1.5% DDTC solution. Accuracy was evaluated by recovery assays and ranged from 91 to 113% for Cd and from 95 to 108% for Pb, with RSD below 10 and 7%, respectively. The LODs were 0.006 and 0.072 ng L (1) for Cd and Pb, respectively. The optimized method was applied for the determination of Cd and Pb in soft drinks with different brands and flavours. (C) 2016 Elsevier Ltd. All rights reserved.
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