Improvements in the non-dispersive atomic fluorescence spectrometric determination of arsenic and antimony by a hydride generation technique

Determination of selenite, selenate and selenocyanate in waters by ion chromatography-hydride generation-atomic fluorescence spectrometry (IC-HG-AFS)

“…Under the chosen conditions (Table 1), Se(VI) reduction by HCl was undetectable at any investigated temperature (therefore, no graph is shown in Fig. 3), while quantitative conversion of Se(VI) to Se(IV) was achieved at 100 uC with HBr, confirming that Br 2 is oxidized faster by SeO 4 22 than Cl 2 . In the same experiment, we also found that using HCl instead of HBr for the on-line reaction always resulted in a lower response for SeCN.…”

“…Increasing the flow rate of H 2 added to the flame resulted in slightly decreasing sensitivity for Se and increasing flame background and noise, confirming previous results for the ND-AFS determination of As and Sb. 22 Therefore, no additional H 2 should be added into the GLS on top of the 42 mL min 21 generated by the HG reaction under the optimized conditions (Table 1; assuming stochiometric H 2 -generation), in order to achieve the optimal signal-to-noise ratio. However, the H 2 diffusion flame produced by the HG reaction is very weak and practically invisible, so a supplemental H 2 stream of 45 mL min 21 is added into the GLS during routine analyses to sustain the flame, as suggested previously, 8 even if this compromises instrumental sensitivity slightly in exchange for increased robustness.…”

Non-chromatographic hydride generation atomic spectrometric techniques for the speciation analysis of arsenic, antimony, selenium, and tellurium in water samples—a review

“…Tsuji and Kugu [184,185] first reported HG coupled with AFS. Mester and Foder [186] studied the characteristics of AF signals of As species and emphasized the need for independent calibration for each As species.…”

Use of a flow injection hydride generation technique in non-dispersive atomic fluorescence spectrometry

“…To date there are a number of publications in this area and refs. 5 , HCLs; 3, power supply for HCLs; 4, atomizer; 5, furnace power supply; 6, photomultiplier tube (PMT) (R106); 7, power supply for PMT; 8, pre-amplifier; 9, computer; and 10, read-out devices using FI for NDAFS, and to establish the optimum conditions for the following hydride forming elements: As, Sb, Bi, Se and Te, and for Hg. At the same time, consideration was given to the establishment of 'compromise' conditions, i.e., a set of conditions that could be used for the determination of all (or several) of the elements simultaneously without sacrificing too much signal response.…”