Hyphenation of flow injection/sequential injection with chemical hydride/vapor generation atomic fluorescence spectrometry

Sequential injection lab-on-valve platform as a miniaturisation tool for solid phase extraction

“…This goal can be achieved by using sophisticated high cost instrumentation associated to individual or hyphenated detection involving mass spectrometry, chromatography, atomic absorption or emission spectrometry. 6,[14][15][16] On the other hand, spectrophotometry can be a low cost alternative and in fact is the most common detection method used to quantify chemical components; 11 however, the selectivity and sensitivity is oen insufficient for today's analytical demands. This limitation can be somewhat overcome by using solid phase extraction prior to the spectrophotometric measurement.…”

Application of Preconcentration and Separation Techniques in Atomic Fluorescence Spectrometry

“…However, compared to LLE, SPE has several advantages, such as higher enrichment factors with better recoveries, more efficient removal of matrix interferences, less consumption of organic solvents, and easier phase separation as well (34). Moreover, with the aid of flow injection (FI) sample manipulation, SPE can be combined with different detection techniques in on-line mode for further automation, which endows it with simpler, faster, and more accurate operation (7,35). As a result, it has enormous potential acting as the vital step of sampling and sample preparation in chemical analysis.…”

An on-line preconcentration system for the determination of selenium in seawater samples

“…The ow rate of sodium borohydride solution is a very important factor because it controls the rate of desorption of Se(IV) ions from the minicolumn, and directly inuences the conditions of formation of volatile hydride H 2 Se. 7,20,22 Fig. 3 presents the inuence of sodium borohydride solution ow rate on the proposed system.…”

“…19 In these processes, an enrichment of analyte occurs before the hydride generation, and also there is the elimination/reduction of interferents. 7,20,21 In this paper we propose an on-line preconcentration system using solid phase extraction coupled with HG-AAS. The variables that inuence the on-line system were studied, and the procedure was applied to determine the selenium content in seawater samples.…”