Determinação de Cd por FAAS em meio aquoso após pré-concentração em linha sobre SiAT
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Abstract
(SiAT), os resultados de um estudo de adsorção e de pré-concentração (em batelada, e em fluxo utilizando-
se a técnica de coluna) de íons Cd(II) em meio aquoso. A capacidade máxima de adsorção de íons Cd(II)
determinada para SiAT foi de 1,12 mmol g -1 . Os resultados obtidos nos experimentos em fluxo, mostraram
uma recuperação de 98% dos íons Cd(II) adsorvidos em coluna empacotada com 1 g de SiAT, utilizando-
se 5 mL de HCl 1 mol L -1 como eluente. A metodologia proposta mostrou-se linear na faixa de concentração
de 10 – 100 mg L -1 , com limite de detecção de 0,80 mg L -1 e desvio padrão relativo de 3%. O fator de
enriquecimento determinado foi de 29 vezes (considerando-se a percolação de 150 mL de solução 25 mg
L -1 de Cd(II), 5 mL de eluato). A sorção-desorção quantitativa dos íons Cd(II), permitiram a aplicação do
método na pré-concentração e posterior quantificação de traços de Cd(II) em amostras de águas naturais
por espectrometria de absorção atômica com chama.
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