Method development for the determination of thallium in coal using solid sampling graphite furnace atomic absorption spectrometry with continuum source, high-resolution monochromator and CCD array detector

Silva, Alessandra F.; Borges, Daniel L. G.; Welz, Bernhard; Vale, Maria Goreti R.; Silva, Márcia M.; Klassen, Aline; Heitmann, Uwe

doi:10.1016/j.sab.2004.03.001

Cited by 70 publications

(25 citation statements)

References 16 publications

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“…Details of this equipment were described previously [12,15]. The transversely heated graphite tube atomizer is very similar to that of the ZEEnit 600, but without a Zeeman magnet, facilitating direct comparisons between the two instruments.…”

Section: Instrumentationmentioning

confidence: 99%

Investigation of the feasibility to use Zeeman-effect background correction for the graphite furnace determination of phosphorus using high-resolution continuum source atomic absorption spectrometry as a diagnostic tool

Lepri

Welz

Dessuy

et al. 2010

Spectrochimica Acta Part B: Atomic Spectroscopy

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The determination of phosphorus by graphite furnace atomic absorption spectrometry at the non-resonance line at 213.6 nm, and the capability of Zeeman-effect background correction (Z-BC) to deal with the finestructured background absorption due to the PO molecule have been investigated in the presence of selected chemical modifiers. Two line source atomic absorption spectrometers, one with a longitudinally heated and the other with a transversely heated graphite tube atomizer have been used in this study, as well as two prototype high-resolution continuum source atomic absorption spectrometers, one of which had a longitudinally arranged magnet at the furnace. It has been found that Z-BC is capable correcting very well the background caused by the PO molecule, and also that of the NO molecule, which has been encountered when the Pd + Ca mixed modifier was used. Both spectra exhibited some Zeeman splitting, which, however, did not cause any artifacts or correction errors. The practical significance of this study is to confirm that accurate results can be obtained for the determination of phosphorus using Z-BC. The best sensitivity with a characteristic mass of m 0 = 11 ng P has been obtained with the pure Pd modifier, which also caused the lowest background level. The characteristic mass obtained with the mixed Pd+Ca modifier depended on the equipment used and was between m 0 = 9 ng P and m 0 = 15 ng P, and the background signal was higher. The major problem of Z-BC remains the relatively restricted linear working range.

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Section: Instrumentationmentioning

confidence: 99%

Investigation of the feasibility to use Zeeman-effect background correction for the graphite furnace determination of phosphorus using high-resolution continuum source atomic absorption spectrometry as a diagnostic tool

Lepri

Welz

Dessuy

et al. 2010

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…The strong background absorption essentially disappeared when the pyrolysis temperature was increased to 700°C, as can be seen in Fig. 4b, a pyrolysis temperature that could be applied for the determination of lead [53] and thallium [54] without using a modifier, whereas iridium was applied as permanent chemical modifier for the determination of cadmium [52]. A structured background absorption appeared for all elements after the analyte signal, which could however be separated in time from the atomic absorption by optimizing the atomization temperature, so that no additional background correction using LSBC had to be applied.…”

Section: Direct Analysis Of Solid Samples and Slurriesmentioning

confidence: 99%

High-resolution continuum source electrothermal atomic absorption spectrometry — An analytical and diagnostic tool for trace analysis

Welz

Borges

Lepri

et al. 2007

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…Graphite furnace atomic absorption spectrometry [9,10] flow injection-differential pulse-anodic stripping voltammetry [11] cathodic and anodic stripping voltammetry [12][13][14], electrothermalatomic absorption spectrophotometry [15,16] inductively coupled plasma mass spectrometry [17][18][19][20] and thermal neutron activation analysis [21] are the most popular analytical techniques used for the determination of thallium at trace levels. However, these techniques are disadvantaged by the long duration, matrix effects, expensive facilities and their maintenance.…”

Section: Introductionmentioning

confidence: 99%

Determination of thallium in environmental samples by surfactant assisted dispersive liquid-liquid microextraction combined with first order derivative spectrophotometry

2015

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A surfactant assisted dispersive liquid-liquid microextraction (SA-DLLME) combined with derivative spectrophotometric method has been proposed for the determination of thallium(III) using a chelating agent diacetylmonoxime-p-hydroxybenzoylhydrazone. Disperser solvent was substituted by surfactant, which made the emulsification more effective and extraction, quite environment friendly. Carbon tetrachloride was employed as the extractant. The developed SA-DLLME technique was coupled with first order derivative spectrophotometric method to improve the analytical performance. Optimum conditions relevant to SA-DLLME and instrumental parameters were studied in detail. The enrichment factor of the method was found to be 23. The limit of detection and quantitation limit of first order derivative spectrophotometric method were found to be 0.22 and 0.67 µg/L, respectively. The relative standard deviation (RSD) for five replicates of 50.0 µg/L of thallium(III) was found to be 1.12%. The applicability of the method was evaluated by the trace level determination of thallium in different environmental samples.

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Method development for the determination of thallium in coal using solid sampling graphite furnace atomic absorption spectrometry with continuum source, high-resolution monochromator and CCD array detector

Cited by 70 publications

References 16 publications

Investigation of the feasibility to use Zeeman-effect background correction for the graphite furnace determination of phosphorus using high-resolution continuum source atomic absorption spectrometry as a diagnostic tool

Investigation of the feasibility to use Zeeman-effect background correction for the graphite furnace determination of phosphorus using high-resolution continuum source atomic absorption spectrometry as a diagnostic tool

High-resolution continuum source electrothermal atomic absorption spectrometry — An analytical and diagnostic tool for trace analysis

Determination of thallium in environmental samples by surfactant assisted dispersive liquid-liquid microextraction combined with first order derivative spectrophotometry

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