Um método automático de extração em fase única para a determinação de cromo em água e vinagre por espectrometria de absorção atômica em forno de grafite

Abstract

The single-phase extraction is based on the formation of a homogeneous mixture formed ideally between two immiscible phases (aqueous and organic) and a third component in the two immiscible phases, is added to achieve opalescence. In this mixture the complexation reactions occur and the subsequent extraction is performed by breaking the phase equilibrium by addition of an excess of the components of the mixture. However, the automation of this method by analyzing flow injection requires a device with a significant degree of complexity and difficult to control operating parameters. The objective of this study was to develop an automatic method of extracting single phase using flow-batch in question applied to the quantification of chromium in water and in commercial samples of vinegar by atomic absorption spectrometry graphite furnace. To this end, modifications have been made both in the mixing chamber (two outputs) as the extraction method, in which more suited to this proposal chemical systems were studied. The performance of the method was attested by statistical tests, in terms of precision (RSD <12%), accuracy (recovery between 82 and 108%), (m0 = 0.32 pg L-1 and LOQ = 0.86 μgL -1) and analytical frequency (26h-1). In this new strategy, the whole process of extraction was performed in mixing chamber quickly, simply and with adequate sensitivity to GF AAS technique. Moreover, it was possible to analyze samples of different matrices using the same method