J. Braz. Chem. Soc. vol.18 número7

Initially, experiments were performed varying the volume of sampling loop (Figure 1) to verify the response of the resin column to retain bromide ions yielding the results summarized

Determination of Trace Amounts of Copper in River and Sea Water Samples by Flame Atomic Absorption Spectrometry (FAAS) after Cloud-point Preconcentration..

Preconcentration is based on the analyte sorption on a microcolumn of dibenzo-18-crown-6 (DB18C6) immobilized on surfactant coated alumina with subsequent elution using a nitric

Commercial lipase preparations were immobilized on polysiloxane-polyvinyl alcohol particles (POS-PVA) previously activated with different agents (glutaraldehyde, sodium

The aim of the present work is, therefore, to investigate the previous hypothesis about the mechanism of chiral recognition, studying the enantioseparation of valine,

Aerial parts of cultivated Egletes viscosa Less were harvested from garden beds at the Departamento de Fitotecnia of the Universidade Federal do Ceará, Fortaleza, Ceará

molecular hyperpolarizabilities ( β mol ) were calculated in gas phase for the croconate free ion and for the most favorable complexes optimized at B3P86 level of theory employing

IR spectra of solid complexes of chitosan and Cu 2+ extracted from aqueous HCl solutions at various pHs in ligand to metal ratio of 1:1... secondary