| Texto completo | |
| Autor(es): |
Bueno Guerra, Marcelo Braga
;
Goncalves Reynaud Schaefer, Carlos Ernesto
;
Machado Michel, Roberto Ferreira
;
Rosa, Paula de Freitas
;
Pereira-Filho, Edenir Rodrigues
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | BRAZILIAN JOURNAL OF ANALYTICAL CHEMISTRY; v. 1, n. 3, p. 10-pg., 2011-01-01. |
| Resumo | |
In this study, some analytical and chemometric strategies were used for the comparison of chemical features of soil samples collected near the Brazilian Antarctic Station and sites further from it. As a preliminary analysis, synchrotron radiation X-Ray Fluorescence was employed. Besides, the soil characteristics: total organic carbon, soil pH and bioavailable/pseudototal concentrations of Cd, Cr, Ni and Pb were determined. In order to achieve both high analytical throughput and sensitivity over the conventional mono-element flame AAS, Slotted Tube Atom Trap (STAT) was combined with FS-FAAS for the sequential determination of Cd and Pb in the aqua regia soil extracts. Thermospray Flame Furnace AAS was also used for Cd and Pb quantification in DTPA soil extracts using the monoelement mode. Furthermore, a sequential extraction procedure was applied for Cu, Mn and Zn determination. Copper, Mn, Ni and Zn were determined by FAAS in the fast-sequential mode which allows reduction in the analysis time and minimization of sample consumption and waste generation. By the use of Principal Component Analysis and Hierarchical Cluster Analysis, a clear differentiation was observed between the sampling sites. This finding indicates anthropogenic disturbance by the scientific station, mainly through Pb, Cr and Ni deposition. However, the concentrations for the most impacted sites do not exceed guidelines for soil quality, except for Cr. Nevertheless, mitigation and treatment of contaminated areas could be important for preservation of the local ecosystem. (AU) | |
| Processo FAPESP: | 07/04515-4 - Avaliação da combinação da espectrometria de absorção atômica com determinação sequencial e a espectrometria de absorção atômica com tubo na chama e aerossol térmico |
| Beneficiário: | Edenir Rodrigues Pereira Filho |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 09/09481-6 - Avaliação das concentrações de cobre, manganês e zinco em solos da Antártica utilizando extração seqüencial e ferramentas quimiométricas |
| Beneficiário: | Paula de Freitas Rosa Remiro |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |
| Processo FAPESP: | 08/08260-3 - Análises químicas de amostras ambientais da Antártica: determinação espectrométrica de Cd, Cr, Ni e Pb, uso de micro-fluorescência de Raios-X com radiação síncrotron e aplicações de ferramentas quimiométricas |
| Beneficiário: | Marcelo Braga Bueno Guerra |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |