Fracionamento geoquímico de metais em sedimentos e avaliação da qualidade da água do Rio Bento Gomes, Pantanal de Poconé, Mato Grosso

Pós-graduação em Química - IQ

Chromium in soil organic matter and cowpea after four consecutive annual applications of composted tannery sludge

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Hydrochemical and stable isotopes (H, O, S) signatures in deep groundwaters of Parana basin, Brazil

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Homogeneity of the geochemical reference material BRP-1 (paranábasin basalt) and assessment of minimum mass

Reference materials (RM) are required for quantitative analyses and their successful use is associated with the degree of homogeneity, and the traceability and confidence limits of the values established by characterisation. During the production of a RM, the chemical characterisation can only commence after it has been demonstrated that the material has the required level of homogeneity. Here we describe the preparation of BRP-1, a proposed geochemical reference material, and the results of the tests to evaluate its degree of homogeneity between and within bottles. BRP-1 is the first of two geochemical RM being produced by Brazilian institutions in collaboration with the United States Geological Survey (USGS) and the International Association of Geoanalysts (IAG). Two test portions of twenty bottles of BRP-1 were analysed by wavelength dispersive-XRF spectrometry and major, minor and eighteen trace elements were determined. The results show that for most of the investigated elements, the units of BRP-1 were homogeneous at conditions approximately three times more rigorous than those strived for by the test of sufficient homogeneity. Furthermore, the within bottle homogeneity of BRP-1 was evaluated using small beam (1 mm(2)) synchrotron radiation XRF spectrometry and, for comparison, the USGS reference materials BCR-2 and GSP-2 were also evaluated. From our data, it has been possible to assign representative minimum masses for some major constituents (1 mg) and for some trace elements (1-13 mg), except Zr in GSP-2, for which test portions of 74 mg are recommended.

Prospecção mineral de alvos potenciais à ocorrência de enriquecimento supergênico de níquel no Greenstone belt do Morro do Ferro

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Caracterização mineralógica e química das fontes de poeira e sua influência na atmosfera da região do polo cerâmico de Santa Gertrudes (SP)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estratigrafia do vulcanismo mesozóico ácido da província magmática do Paraná

The Paraná Magmatic Province was generated by a large volcanic event occurred in the Lower Cretaceous, it was a phenomenon that preceded the fragmentation of the supercontinent Gondwana. In Brazil the volcanic rocks overlying about 75% of the surface of the Parana basin being the Serra Geral Formation essentially represented by basalts and andesites of tholeiitic nature and subordinate porphyritic rhyodacites, called Chapecó type and aphyric rhyolites, Palms type. Based on the chemical compositions, rocks of Palmas type are subdivided into Santa Maria, Clevelândia, Caxias do Sul, Jacuí and Anita Garibaldi. Rocks of Chapecó type are grouped into three distinct subtypes called Guarapuava, Tamarana and Ourinhos. These acidic rocks that overlying basalts are of two main types: high-Ti (Paranapanema, Pitanga and Urubici) and low-Ti (Gramado, Esmeralda and Ribeira). Representative profiles of these rocks were studied in detail in order to establish the lithostratigraphy and Chemostratigraphy of Palmas and Chapecó type. To do this was made a field work and the use of a database with 1109 samples with their geographical coordinates and geochemical information of major and trace elements, which were launched in maps generated by Google Earth. From these maps, it was verified that rocks of the Palmas type are distributed predominantly in the south region of the basin in the state of Rio Grande do Sul, accumulated along Torres Syncline, while those Chapecó type occur in the plateaus of midwestern Paraná, in this region was observed that Chapecó type overlap those Palmas type. In the profiles studied, within Palmas type, Caxias do Sul type is spread throughout the southern region of the basin, occurring at the base of the acid volcanic sequences, in other words, they are older compared to the others. It was also observed that the rocks of Santa Maria and Anita Garibaldi type occupy the top of the sequences, both covering rocks of Caxias do Sul..

Remoção de elementos potencialmente tóxicos em resíduo sólido da indústria canavieira para utilização como condicionador de solo na agricultura

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Quantificação de metais potencialmente tóxicos em mexilhão dourado (Limnoperna fortunei) por espectrometria de absorção atômica com fonte contínua e alta resolução empregando amostragem direta de sólidos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)