J. Braz. Chem. Soc. vol.16 número6A

Different dilutions were used for anions and cations determination: chloride and malate (50 times), potassium (20 times), sulfate, calcium and magnesium (10 times), phosphate

The distribution of mercury contamination in the Santos - São Vicente Estuarine System was observed through the analysis of 31 sediments samples collected from that system,

The nitrile hydratase activity of Nocardia corallina B-276 is described, and the only detected product during the biocatalyzed hydrolysis of selected nitriles was the

derivatization reagent for Pb, Hg, Cd, Ni and Zn ions, and the ZORBAX rapid analysis column was used for the separation of Pb-QAMDHB, Cd-QAMDHB, Hg-QAMDHB, Ni-QAMDHB and

products... resulting mixture was stirred for 5 h at 140 °C, becoming light yellow. The mixture was cooled to the room temperature and a saturated solution of NH 4 Cl was added.

In this work we present a method for the determination of riboflavin in milk, in the presence of tetracyclines (oxytetracycline (OTC), doxycycline (DC) and tetracycline (TC)), using

19 F NMR of these complexes show the presence of syn and anti isomers, consistent with a fast flipping of the metallacycle ring and a slow inversion of configuration at

The ability of monomolecular films of fatty alcohols in reducing evaporation of natural water samples collected from two reservoirs in São Paulo (Guarapiranga and Billings) was