High‐Resolution Continuum Source AAS

Welz, Bernhard; Becker‐Ross, Helmut; Florek, Stefan; Heitmann, Uwe

doi:10.1002/3527606513

Cited by 158 publications

(169 citation statements)

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“…Obviously, all this experience has been obtained in the vicinity of the phosphorus non-resonance line and for the determination of this analyte, and no extrapolation to other analytes and spectral ranges can be offered. This is particularly the case for the PO molecular absorption, which is relatively weak in the vicinity of the 213.618-nm phosphorus line compared to other spectral ranges [12].…”

Section: Resultsmentioning

confidence: 94%

“…This situation is illustrated in Fig. 9a using the HR-CS Z-GF AAS system; the spectrum is part of the Δν = +1 sequence of the NO band system around 214 nm, which is due to the electronic transition X 2 Π → A 2 ∑ + [12]. It is quite obvious from Fig.…”

Section: The Palladium and Calcium Mixed Modifiermentioning

confidence: 97%

“…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%

“…Independent confirmation of the formation of the PO molecule in a graphite furnace has been obtained by Sturgeon and Willie [11] using furnace atomization plasma emission spectrometry (FAPES). The molecular absorption spectrum is part of the X 2 Π → D 2 Π electronic transition of the PO molecule that exhibits a pronounced rotational fine structure [12]. In their studies of phosphorus atomization using HR-CS GF AAS Dessuy et al [13] observed that a 'tail' appeared after the first sharp molecular absorption peak, which was shown to be due to atomic phosphorus.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 94%

Section: The Palladium and Calcium Mixed Modifiermentioning

confidence: 97%

Section: Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Como mencionado anteriormente, esse crescente interesse deve estar relacionado à melhoria na instrumentação disponível comercialmente, que permitiu ampliar a capacidade de aplicações da técnica. O lançamento recente de um espectrômetro de absorção atômica de alta resolução com fonte contínua (HR-CS AAS) 15 , com capacidade única de correção de fundo, de visualização espectral e possibilidade de determinação multielementar a partir da amostragem direta de sólidos, deverá impulsionar as pesquisas e a popularização da técnica.…”

Section: Ss Gf Aas: Contexto Históricounclassified

Análise direta de sólidos por espectrometria de absorção atômica com atomização em forno de grafite: uma revisão

Nomura¹,

Silva²,

Oliveira³

2008

Quím. Nova

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Atomic Spectrometry and Elemental Analysis

Welz

Borges

2009

Digital Encyclopedia of Applied Physics

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This chapter starts with an introduction to the early history of spectroscopic investigations in the nineteenth century, followed by general considerations about atomic spectra and interferences that might be encountered. This chapter discusses optical atomic spectroscopy with its three main techniques, optical emission spectrometry (OES), atomic absorption spectrometry (AAS) and atomic fluorescence spectrometry (AFS), as well as X‐Ray spectroscopy, also including X‐ray emission, absorption, and fluorescence. The section on optical atomic spectroscopy begins with the basic principles of this technique, followed by a description of the physics of atomization and excitation, atomic spectra and spectral lines, and the measurement of radiation, calibration, and evaluation. The section on OES covers excitation sources, including arc and spark sources, glow discharges and inductively coupled plasmas, as well as lasers, which are being used increasingly in laser‐induced breakdown spectroscopy (LIBS). The section on spectrometers deals with mono‐ and polychromators, including the detectors used in this kind of equipment. The section on AAS includes a discussion on the atomizers used for this technique, mainly flames and graphite furnaces, and also on chemical vapor generation techniques, such as cold vapor and hydride generation. Radiation sources and spectrometers for line source AAS as well as those for high‐resolution continuum‐source AAS are described, with a detailed discussion on the new potentialities of the latter technique. The general principles and the instrumentation of AFS are discussed briefly, according to the limited application of this technique, which includes the use of laser‐excited AFS. The section on X‐ray spectroscopy provides the theoretical principles behind the emission and absorption of X‐rays, in particular, X‐ray fluorescence (XRF), using different kind of equipment, that is, wavelength‐dispersive and energy‐dispersive instrumentation. Total‐reflection XRF is discussed as also particle‐induced X‐ray emission (PIXE) and portable instrumentation. The chapter concludes with an outlook on the potential future development in the field of atomic spectroscopy and elemental analysis.

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High‐Resolution Continuum Source AAS

Cited by 158 publications

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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

Análise direta de sólidos por espectrometria de absorção atômica com atomização em forno de grafite: uma revisão

Atomic Spectrometry and Elemental Analysis

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