4 documents found, page 1 of 1
Padrões espácio-temporais dos visitantes dos Passadiços do Paiva
Costa, Jorge; Castro, Marisa; Gomes, António Alberto; Saraiva, Miguel Marinho
Validation of an electrothermal atomization atomic absorption spectrometry meth...
Figueiredo, Ana E.; Soares, Maria Elisa; Baptista, Paula; Castro, Marisa; Bastos, Maria de LourdesAn ETAAS method was validated to quantify total Cr and CrVI in mushrooms and the underlying soils. The method includes a sample pretreatment for total Cr dissolution using a wet acid digestion procedure and a selective alkaline extraction for CrVI. The limits of detection were, expressed in íg/L, 0.15 and 0.17 for total Cr and CrVI, respectively. The linearity ranges under the optimized conditions were 0.15-25....
Validação de uma metodologia por EAA/AE para avaliação dos níveis de crómio tot...
Figueiredo, Ana E.; Soares, Maria Elisa; Baptista, Paula; Castro, Marisa; Bastos, Maria de LourdesOs cogumelos têm sido utilizados como bioindicadores da contaminação ambiental provocada por alguns metais pesados, tais como, o cádmio, cobre, chumbo, crómio, mercúrio e zinco. Vários autores referem que foram observadas grandes concentrações de metais pesados nestes macromicetes colhidos em zonas muito poluídas, como sejam, a proximidade de estradas com muito trânsito, zonas industriais onde haja emissão de g...
A case study of molinate application in a Portuguese rice field: herbicide diss...
Castro, Marisa; Ferreira, António C. Silva; Manaia, Célia M.; Nunes, Olga C.This study was designed to monitor molinate losses in surface and underground waters during Ordram application in a rice field situated in central Portugal. Water samples were collected from different sites, before, during and about one month and a half after Ordram application. Molinate quantification was based on a solid-phase microextraction (SPME) method followed by gas chromatography with flame photometric...