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Pathway of rare-earth elements in a Brazilian forestry fragment

2002; Elsevier BV; Volume: 344; Issue: 1-2 Linguagem: Inglês

10.1016/s0925-8388(02)00298-0

1873-4669

Elvis Joacir de França, Elisabete A. De Nadai Fernandes, M. A. Bacchi, F. S. Tagliaferro,

Heavy Metals in Plants

The Mata de Santa Genebra is a fragment of semi-deciduous tropical forest located in an urban area of São Paulo State, Brazil. Potential sources of rare-earth elements (REE), such as oil refinery, agricultural activities and high-traffic roads, are situated close to this region. In this study, the central portion of the fragment dominated by Pachystroma longifolium and Esenbeckia leiocarpa was evaluated for the distribution of La, Ce, Nd, Sm, Eu, Tb and Yb in the soil, leaf and litter sub-compartments applying instrumental neutron activation analysis (INAA). Leaf/soil concentration ratios (CR) of P. longifolium were higher than those obtained for E. leiocarpa by a factor of 20. Considering leaf/litter concentration ratios, no retranslocation of these elements was noticed for both species before litterfall. Accumulation of REE and typical distribution patterns were observed for the plant sub-compartments. The high La content may be attributed to preferential uptake by these plants or to external atmospheric sources.