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Disposal of dredged sediments in tropical soils: ecotoxicological effects on ea...
Cesar, Ricardo; Natal-da-Luz, Tiago; Sousa, José Paulo; Colonese, Juan; Bidonne, Edison; Castilhos, Zuleica; Egler, Silvia; Polivanov, HelenaThe upper limit concentrations of metals established by international legislations for dredged sediment disposal and soil quality do not take into consideration the properties of tropical soils (generally submitted to more intense weathering processes) on metal availability and ecotoxicity. Aiming to perform an evaluation on the suitability of these threshold values in tropical regions, the ecotoxicity of metal...
Characterization of a brazilian smectite by solid state NMR and X-ray diffracti...
Guarino,Alcides Wagner Serpa; Gil,Rosane A. S. San; Polivanov,Helena; Menezes,Sonia M.C.X-ray diffraction (XRD), differential thermal analysis (DTA) and 27Al and 29Si solid state MAS-NMR techniques were used to monitor the fractionation steps of a brazilian smectite, previously crushed, from Campina Grande, Paraíba. The sand, silt and clay fractions were obtained by physical and chemical treatments. The XRD analysis of sand and silt fractions showed that both fractions had predominant quartz and f...
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