Unusual calibration curves observed for iron using high-resolution continuum source graphite furnace atomic absorption spectrometry

Welz, Bernhard; Santos, Lísia Maria Gobbo dos; Araújo, Rennan Geovanny Oliveira; Jacob, Silvana do Couto; Vale, Maria Goreti R.; Okruss, Michael; Becker‐Ross, Helmut

doi:10.1016/j.sab.2010.01.007

Cited by 11 publications

(7 citation statements)

References 14 publications

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“…Fortunately, use of high-resolution continuum source AAS provides an advantage in this regard, as it is possible to expand the linear range simply by selecting the appropriate detector pixels on the wings of the absorption line prole. 27,28,40,41 Indeed, as higher analyte amounts are introduced into the atomizer, at some mass the signal at the center of the absorption line will grow more slowly, losing the linear response and eventually become saturated or even self-absorbed. However, as the analyte mass increases, the absorption line prole also becomes broader, such that use of side pixels becomes advantageous by permitting an increase in the working range.…”

Section: Wavelength Selectionmentioning

confidence: 99%

Simultaneous determination of Co, Fe, Ni and Pb in carbon nanotubes by means of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry

Resano

Bolea-Fernández

Mozas

et al. 2013

J. Anal. At. Spectrom.

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This work explores the possibilities of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry for the direct analysis of carbon nanotubes. In particular, the simultaneous determination of Co, Fe, Ni and Pb is intended, as these elements are typically found in these samples as impurities. The results demonstrate that it is possible to find spectral (monitoring of the region between 283.168 and 283.481 nm), furnace (2500 C for atomization; use of 100 ng Pd as a chemical modifier) and detector (use of side pixels to expand the linear range) conditions that permit the development of a fast and straightforward method for the simultaneous determination of the target elements at the levels at which they are typically found (mg g À1 for Co, Fe and Ni; mg g À1 for Pb) in carbon nanotubes. Limits of detection of 23 pg (Pb), 6 ng (Fe), 65 ng (Ni) and 86 ng (Co) were obtained, which are suitable for this type of sample. In this way, it was feasible to carry out the analysis of the samples investigated (one candidate reference material and three commercially available samples) and achieve accurate results when constructing the calibration curve with aqueous standards.Precision values for 5 solid sample replicates varied between 7 and 15% RSD in most cases. Overall, the proposed method shows important benefits for the cost-effective analysis of such complex samples in routine labs.

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Section: Wavelength Selectionmentioning

confidence: 99%

Simultaneous determination of Co, Fe, Ni and Pb in carbon nanotubes by means of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry

Resano

Bolea-Fernández

Mozas

et al. 2013

J. Anal. At. Spectrom.

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“…This aspect is remarkable because, although attaining such a wide working range for a narrow atomic line, such as the one used for Ag, with ame atomization has been reported, 46 much more moderate gains are typically observed for other elements 49 particularly when using GFAAS, 27 and sometimes anomalous behaviors (two different linear regions) have been described in the literature. 50 It is therefore not clear yet what level of enhancement can be considered as typical when using side pixel registration, and more results on this topic would be welcome.…”

Section: Paper Analytical Methodsmentioning

confidence: 99%

Potential of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry to monitor the Ag body burden in individual Daphnia magna specimens exposed to Ag nanoparticles

2013

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This work evaluates the potential of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry (HR CS GFAAS) for the direct determination of the Ag body burden in individual specimens of Daphnia magna (a small aquatic invertebrate of approx. 2 mm length typically used in ecotoxicological studies) exposed to different Ag species, and particularly to Ag nanoparticles (NPs). It is shown that this technique offers unique features for this type of application, permitting the direct analysis of these organisms in a very straightforward way (only approx. 2-3 min are required for the analysis of every individual) and constructing the calibration curve with aqueous standards. Moreover, appropriate selection of the detector pixels used for signal quantification makes it feasible to achieve a very broad linear range for any set of experimental conditions, contrary to what occurs for traditional line source-GFAAS. This feature is particularly important for this application, as every Daphnia magna specimen can be measured only once and its Ag content is not known in advance. In this case, the use of central and/or side pixels permits achieving a working range between 3 pg and 1 mg for the 328.068 nm Ag line, thus allowing analysis of all the samples of interest with the same experimental settings.

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“…seem to show linearity in other ranges, 33 from 120 or 200 to 400 ng and probably more, but notice that such linearities (e.g., from 200 to 400 for pixels 131, 114 and 100) do not necessarily go through the intercept. That means that this second range of linearity could be used for external calibration, 35 but not for MEC or MER as the equations shown in sections 3.1.1 and 3.1.2 will not be valid.…”

Section: Monitoring Cabr Around 625 Nm: Different Intensity Transitionsmentioning

confidence: 99%

Introducing multi-energy ratios as an alternative to multi-energy calibration for Br determination via high-resolution continuum source graphite furnace molecular absorption spectrometry. A case study

Garde

Nakadi

García-Ruiz

et al. 2020

J. Anal. At. Spectrom.

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Unusual calibration curves observed for iron using high-resolution continuum source graphite furnace atomic absorption spectrometry

Cited by 11 publications

References 14 publications

Simultaneous determination of Co, Fe, Ni and Pb in carbon nanotubes by means of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry

Simultaneous determination of Co, Fe, Ni and Pb in carbon nanotubes by means of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry

Potential of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry to monitor the Ag body burden in individual Daphnia magna specimens exposed to Ag nanoparticles

Introducing multi-energy ratios as an alternative to multi-energy calibration for Br determination via high-resolution continuum source graphite furnace molecular absorption spectrometry. A case study

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