Pré-concentração por extração em ponto nuvem para determinação de cádmio em amostras de bebidas por espectrometria de absorção atômica como forno tubular na chama e aerossol térmico / Preconcentration and Determination of Cadmium in Beverage Samples by Cloud Point Extraction and Thermospray Flame Furnace Atomic Absorption Spectrometry detection

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

In this work, it was evaluated extraction/preconcentration cloud point procedure for cadmium determination in soft drinks samples stored in polyethylene terephthalate (PET) packaging and detection by thermospray flame furnace atomic absorption spectrometry (TS -FF-AAS). For the cloud point preconcentration procedure were used Triton X-114 as surfactant, PAN as complexing agent and sodium chloride as electrolyte, to induce the formation of point cloud without heating. The parameters complexation time, Triton X-114, PAN and sodium chloride concentrations were optimized using factorial designs and surface response methodologies. For TS-FF-AAS, a volume of 100 mL was introduced into the hot Ni tube using water carrier at a flow rate of 0.4 mL min-1. Under the optimized conditions were obtained detection limit of 0.0178 mg L-1, quantification limit of 0.0595 mg L-1, relative standard deviation (RSD) of 4.1% for n = 6 and an enhancement factor of 55.5. The accuracy was checked by addiction-recovery experiments and the method was applied to samples of soft drinks.

ASSUNTO(S)

quimica cádmio espectrometria de absorção atômica

ACESSO AO ARTIGO

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