Behaviour of chromium in the graphite furnace during the performance of the flameless absorption spectrometry

“…Up to now there are few applications of these modifiers [3,6,8] for real analysis, although all above mentioned advantages are well known. It seems that some limitations restrict the area of application of these modifiers.…”

mentioning

confidence: 96%

“…The exceptional effectivity of palladium-containing modifiers and especially of the mixed palladium modifiers has not been studied so far [2][3][4][5][6][7][8]. A thorough investigation of the advantages and limitation of the mixed palladium-containing chemical modifiers is needed.…”

mentioning

confidence: 99%

Study of some palladium-containing chemical modifiers in graphite furnace atomic absorption spectrometry

1995

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“…3387 C, b.p. 4139 C), on the other hand, has been used in a number of similar applications, but in the majority of cases, it was introduced as tube or platform coating material [7,8] and to a lesser extent than tungsten compounds [9,10]. These compounds have been reported as chemical modi®ers for the graphite furnace atomization of a variety of elements, and specially for the most volatile ones like As [11,12], Se [13], Te [14], Tl [7], Sn [8,15].…”

mentioning

confidence: 97%

SEM-EDXRF Study of Two Chemical Modifiers Based on Platinum and Tungsten and Their Effect on ET-AAS Atomization of Lead

et al. 2001

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The behavior of two chemical modi®ers based on platinum and tungsten, is studied in the two parts of this work. At ®rst, the chemical and morphological alterations of these during pyrolysis and atomization stages in electrothermal atomic absorption spectrometry are studied. The compounds were H 2 PtCl 6 and Na 2 WO 4 . A cylindrical graphite tube was used, and ®xed shaped rectangular graphite plates were put inside as platforms to prepare the specimens. The crystalline formations on the platforms were studied by scanning electron microscopy and the energy dispersive X-ray spectra allowed the estimation of the chemical composition changes of the modi®ers and the graphite surface. According to the spectra and the images obtained, both modi®ers where found to change their crystalline form at temperatures between 500±1250 C. Severe corrosion of the graphite surface was observed in case of H 2 PtCl 6 at temperature higher than 750 C, while minor damages were observed in case of Na 2 WO 4 . In the second part of this work, the ef®ciency of these modi®ers was tested for maximum loss-free pyrolysis temperature and atomization of lead by electrothermal atomic absorption spectrometry. The optimum results, concerning these parameters, obtained for medium concentration of the modi®ers. The effect of each modi®er on the atomization signal is discussed, and the optimum concentration of each one is estimated.

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Behaviour of chromium in the graphite furnace during the performance of the flameless absorption spectrometry

Cited by 22 publications

References 17 publications

Electrothermal Atomic Absorption Determination of Chromium in Sediments

Electrothermal Atomic Absorption Determination of Chromium in Sediments

Study of some palladium-containing chemical modifiers in graphite furnace atomic absorption spectrometry

SEM-EDXRF Study of Two Chemical Modifiers Based on Platinum and Tungsten and Their Effect on ET-AAS Atomization of Lead

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