This paper presents a study on the translocation factors (TFs) and bioconcentration factors (BCFs) of copper (Cu), manganese (Mn), zinc (Zn), cobalt (Co), chromium (Cr), cadmium (Cd), lead (Pb), iron (Fe), nickel (Ni), and arsenic (As) ions in roots, stems, and leaves of tobacco. The results revealed that during the tobacco growth, the roots are able to increase the sensitiveness of the physiological control, reducing the translocation of the metals Ni (0.38) and Pb (0.48) to the leaves. Cd and Zn presented factors TF and BCF >1 in the three tissues under analysis, which indicates the high potential for transportation and accumulation of these metals in all plant tissues. The TF values for Cr (0.65) and As (0.63) revealed low translocation of these ions to the aerial parts, indicating low mobility of ions from the roots. Therefore, tobacco can be considered an efficient accumulator of Ni, Cr, As and Pb in roots and Cd and Zn in all plant parts.
Neste trabalho foi realizado a determinação por espectrometria de absorção atômica de chama dos metais Cu, Mn, Zn, Fe, Pb, Cr, Co, Cd e caracterizações através de técnicas gravimétricas (umidade e teor de cinzas) e eletroquímica (pH) nas duas marcas de cigarros mais consumidas legalmente no Brasil. Os resultados de recuperação dos analitos foram entre 91,5 a 111,4 % com desvio padrão relativo entre 1,24 a 4,53 %. Os testes realizados nas marcas dos cigarros mostraram média do teor umidade 13,0%, cinzas 14,1% e pH 5,0. A ordem de maior concentração dos metais foi Fe > Mn > Zn > Cu > Pb > Co > Cr > Cd, os resultados apontam, que as marcas de cigarros analisadas possuem concentrações de Cd superior a quarenta e quatro vezes o encontrado em cigarros legalizados nos Estados Unidos, vinte vezes mais Pb que o encontrado em cigarros na Polônia.
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