14 research outputs found
Limnological characterisation and phytoplankton seasonal variation in a subtropical shallow lake (Guaiba Lake, Brazil): a long-term study
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USE OF THE COMPOSITE CELLULOSE-ZIRCONIUM(IV) OXIDE IN A CHROMIUM(VI) PRECONCENTRATION IN-LINE IN A FLOW-INJECTION ANALYSIS SYSTEM
No full textDetermination of Cr(VI) using the composite cellulose-zirconium(IV) oxide with 5% w/w of zirconium was possible, A flow injection system in line with a minicolumn with the material was used to selectively adsorb Cr(VI). By injecting a standard solution of Cr(VI) 50 mu g dm(-3), pH 1, at different loading times (10, 40, 70 and 100 seconds), a linear correlation between absorbance and mass of Cr(VI) was obtained, Samples with Cr(VI) between 2 and 50 mu g dm(-3) were analyzed. The relative standard deviations were found within 1.87 and 6.88%. Analysis of Cr(VI) in presence of interferent ions, Cr(III), Cu(II), Mn(II), Hg(II), Fe(III), VO3-, MoO42-, SO42-, PO43- and MnO4-, were also studied.18433734
I Diretriz da Sociedade Brasileira de Cardiologia sobre Processos e Competências para a Formação em Cardiologia no Brasil
No full textA importância da anuscopia de alta resolução para o diagnóstico do papilomavírus humano anorretal na forma subclínica, das lesões anais intraepiteliais e do carcinoma "in situ"anal
No full textAnemia em crianças menores de cinco anos que freqüentam creches públicas do município do Rio de Janeiro, Brasil
No full textSocial support network, mental health and quality of life: a cross-sectional study in primary care
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