Direct experimental evidence for in situ graphite and palladium selenide formations with improvement on the sensitivity of selenium in graphite furnace atomic absorption spectrometry

Teague-Nishimura, Janet E.; Tominaga, Takeshi; Katsura, Tsutomu; Matsumoto, Kazuko

doi:10.1021/ac00140a015

Cited by 66 publications

(17 citation statements)

References 20 publications

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“…It is possible that the analyte is vaporized from the surface of the droplets [13]. The existence of various compounds between Pd and Se or Sn is shown using the different instrumental methods -SEM, ~tEDXRD [14][15][16]. Indirectly the possibility to form [Pd, Se, O] species during pyrolysis and vaporization of Se from that mixture also was shown by scanning electron microscopy [17].…”

Section: Methodsmentioning

confidence: 99%

Release of selenium and tin from the graphite support in the presence of tungsten and palladium modifiers

Manev

Lazarov

1997

React Kinet Catal Lett

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Electrothermal atomic absorption spectrometry is applied to investigate the release of the selenium and tin atoms from pyrocoated graphite support. The Coats and Redfern and Sturgeon approaches are used for estimation of the apparent activation energies of atom release. The addition of tungsten and palladium modifiers leads to enhancement of the activation energies and changes the bind of the vaporizing species for analytes

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Section: Methodsmentioning

confidence: 99%

Release of selenium and tin from the graphite support in the presence of tungsten and palladium modifiers

Manev

Lazarov

1997

React Kinet Catal Lett

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“…We used palladium as the matrix modifier at a concentration of 50 pg/1 in the injected solution [12]. The standard addition method was used.…”

Section: Methodsmentioning

confidence: 99%

Availability of Selenium in Dough and Biscuit in Comparison to Wheat Meal

et al. 1990

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We studied the availability of selenium in processed foods and whole wheat diets for restoring the Se content and glutathione peroxidase (GSHPx) activity in the blood and liver of selenium-depleted rats. The Se content in the rat diets ranged from 225 to 342 µg Se/kg diet. Different selenium sources and different Se amounts had little influence on the Se levels in the blood and liver of repleted rats. Se from processed foods did not completely restore the GSHPx activity in whole blood and liver as happened with Se coming from wheat. These results indicate that it is the milling processes of the flour production, and not the cooking, which decrease the availability of Se for GSHPx synthesis in rats.

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“…When the chemical modifier contains 150 µg Ni 2+ and 100 µg NH4NO3, the absorbance slightly increases as Pd increases from 0 to 5.5 µg and then decreases after 5.5 µg. Pd may form stable complexes (SePd 37,38 and/or SePd2 34,38 ) with Se and eliminate the phosphorousmolecular interference in urine and serum. 35 Therefore, the sensitivity for Se is enhanced.…”

Section: For Se In Urinementioning

confidence: 99%

Determination of Beryllium and Selenium in Human Urine and of Selenium in Human Serum by Graphite-Furnace Atomic Absorption Spectrophotometry

2001

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Direct experimental evidence for in situ graphite and palladium selenide formations with improvement on the sensitivity of selenium in graphite furnace atomic absorption spectrometry

Cited by 66 publications

References 20 publications

Release of selenium and tin from the graphite support in the presence of tungsten and palladium modifiers

Release of selenium and tin from the graphite support in the presence of tungsten and palladium modifiers

Availability of Selenium in Dough and Biscuit in Comparison to Wheat Meal

Determination of Beryllium and Selenium in Human Urine and of Selenium in Human Serum by Graphite-Furnace Atomic Absorption Spectrophotometry

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