| Full text | |
| Author(s): |
Bueno Guerra, Marcelo Braga
;
Goncalves Reynaud Schaefer, Carlos Ernesto
;
Machado Michel, Roberto Ferreira
;
Rosa, Paula de Freitas
;
Pereira-Filho, Edenir Rodrigues
Total Authors: 5
|
| Document type: | Journal article |
| Source: | BRAZILIAN JOURNAL OF ANALYTICAL CHEMISTRY; v. 1, n. 3, p. 10-pg., 2011-01-01. |
| Abstract | |
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) | |
| FAPESP's process: | 07/04515-4 - Combination of atomic absorption spectrometry with sequential determination and thermospray flame furnace atomic absorption spectrometry |
| Grantee: | Edenir Rodrigues Pereira Filho |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 09/09481-6 - Evaluation of cupper, manganese and zinc concentrations in Antartica soils using sequential extraction and chemometric tools |
| Grantee: | Paula de Freitas Rosa Remiro |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 08/08260-3 - Chemical analyses of environmental samples from Antartica: spectrometric determination of Cd, Cr, Ni and Pb, use of micro X-Ray fluorescence with synchrotron radiation and application of chemometric tools |
| Grantee: | Marcelo Braga Bueno Guerra |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |