Determination of barium by atomic absorption spectrometry with electrothermal atomisation. Part 1. Study of the volatilisation and atomisation of solid barium phosphate, silicate, molybdate, vanadate and molybdovanadate compounds

János Kelemen, Ottó Szakács, A. Lásztity

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Abstract

Molybdate, vanadate and molybdovanadate ions are recommended as chemical modifiers to suppress matrix effects in the determination of barium by electrothermal atomic absorption spectrometry (ETAAS). These ions form complexes with interfering phosphate and silicate ions and, as they are relatively involatile anions, the release of barium is favoured, thereby standardising evaporation and atomisation conditions, within certain limits. In order to investigate the conditions required to evaporate and atomise the compounds that are assumed to be formed, the most important compounds were prepared in the solid state, and 0.2-1-mg samples were placed in the graphite tube. The solid samples were heated, typically at a rate of 10 °C S-1, and the absorbance versus time curves (volatilisation curves) were recorded. These curves, prepared with various masses of sample, are presented for 11 compounds from which the appearance temperatures (Tapp) of the barium could be deduced. The Tapp values were found to be in the range 1450-2150 °C. Of the compounds investigated, Tapp of barium 8-hydroxyquinolinate is the lowest (1450 °C). The values for barium phosphate (1850 °C) and barium silicate (1980 °C) are significantly higher, with the highest being those for barium molybdate (2050 °C), barium molybdovanadate (2050 °C) and barium molybdophosphate (2150 °C). Barium molybdovanadophosphateand barium molybdovanadosilicate have Tapp values of about 1700 °C. The results of investigations on solutions will be given in a later paper.

Original languageEnglish
Pages (from-to)377-384
Number of pages8
JournalJournal of Analytical Atomic Spectrometry
Volume5
Issue number5
Publication statusPublished - 1990

Fingerprint

Silicates
Atomic absorption spectrometry
Vanadates
Atomization
Barium
Vaporization
Phosphates
Ions
molybdate
Graphite
Anions
Evaporation

Keywords

  • Barium determination
  • Chemical modifier
  • Electrothermal atomic absorption spectrometry
  • Molybdate, vanadate and molybdovanadate ions
  • Volatilisation of solid compounds

ASJC Scopus subject areas

  • Spectroscopy

Cite this

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title = "Determination of barium by atomic absorption spectrometry with electrothermal atomisation. Part 1. Study of the volatilisation and atomisation of solid barium phosphate, silicate, molybdate, vanadate and molybdovanadate compounds",
abstract = "Molybdate, vanadate and molybdovanadate ions are recommended as chemical modifiers to suppress matrix effects in the determination of barium by electrothermal atomic absorption spectrometry (ETAAS). These ions form complexes with interfering phosphate and silicate ions and, as they are relatively involatile anions, the release of barium is favoured, thereby standardising evaporation and atomisation conditions, within certain limits. In order to investigate the conditions required to evaporate and atomise the compounds that are assumed to be formed, the most important compounds were prepared in the solid state, and 0.2-1-mg samples were placed in the graphite tube. The solid samples were heated, typically at a rate of 10 °C S-1, and the absorbance versus time curves (volatilisation curves) were recorded. These curves, prepared with various masses of sample, are presented for 11 compounds from which the appearance temperatures (Tapp) of the barium could be deduced. The Tapp values were found to be in the range 1450-2150 °C. Of the compounds investigated, Tapp of barium 8-hydroxyquinolinate is the lowest (1450 °C). The values for barium phosphate (1850 °C) and barium silicate (1980 °C) are significantly higher, with the highest being those for barium molybdate (2050 °C), barium molybdovanadate (2050 °C) and barium molybdophosphate (2150 °C). Barium molybdovanadophosphateand barium molybdovanadosilicate have Tapp values of about 1700 °C. The results of investigations on solutions will be given in a later paper.",
keywords = "Barium determination, Chemical modifier, Electrothermal atomic absorption spectrometry, Molybdate, vanadate and molybdovanadate ions, Volatilisation of solid compounds",
author = "J{\'a}nos Kelemen and Ott{\'o} Szak{\'a}cs and A. L{\'a}sztity",
year = "1990",
language = "English",
volume = "5",
pages = "377--384",
journal = "Journal of Analytical Atomic Spectrometry",
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TY - JOUR

T1 - Determination of barium by atomic absorption spectrometry with electrothermal atomisation. Part 1. Study of the volatilisation and atomisation of solid barium phosphate, silicate, molybdate, vanadate and molybdovanadate compounds

AU - Kelemen, János

AU - Szakács, Ottó

AU - Lásztity, A.

PY - 1990

Y1 - 1990

N2 - Molybdate, vanadate and molybdovanadate ions are recommended as chemical modifiers to suppress matrix effects in the determination of barium by electrothermal atomic absorption spectrometry (ETAAS). These ions form complexes with interfering phosphate and silicate ions and, as they are relatively involatile anions, the release of barium is favoured, thereby standardising evaporation and atomisation conditions, within certain limits. In order to investigate the conditions required to evaporate and atomise the compounds that are assumed to be formed, the most important compounds were prepared in the solid state, and 0.2-1-mg samples were placed in the graphite tube. The solid samples were heated, typically at a rate of 10 °C S-1, and the absorbance versus time curves (volatilisation curves) were recorded. These curves, prepared with various masses of sample, are presented for 11 compounds from which the appearance temperatures (Tapp) of the barium could be deduced. The Tapp values were found to be in the range 1450-2150 °C. Of the compounds investigated, Tapp of barium 8-hydroxyquinolinate is the lowest (1450 °C). The values for barium phosphate (1850 °C) and barium silicate (1980 °C) are significantly higher, with the highest being those for barium molybdate (2050 °C), barium molybdovanadate (2050 °C) and barium molybdophosphate (2150 °C). Barium molybdovanadophosphateand barium molybdovanadosilicate have Tapp values of about 1700 °C. The results of investigations on solutions will be given in a later paper.

AB - Molybdate, vanadate and molybdovanadate ions are recommended as chemical modifiers to suppress matrix effects in the determination of barium by electrothermal atomic absorption spectrometry (ETAAS). These ions form complexes with interfering phosphate and silicate ions and, as they are relatively involatile anions, the release of barium is favoured, thereby standardising evaporation and atomisation conditions, within certain limits. In order to investigate the conditions required to evaporate and atomise the compounds that are assumed to be formed, the most important compounds were prepared in the solid state, and 0.2-1-mg samples were placed in the graphite tube. The solid samples were heated, typically at a rate of 10 °C S-1, and the absorbance versus time curves (volatilisation curves) were recorded. These curves, prepared with various masses of sample, are presented for 11 compounds from which the appearance temperatures (Tapp) of the barium could be deduced. The Tapp values were found to be in the range 1450-2150 °C. Of the compounds investigated, Tapp of barium 8-hydroxyquinolinate is the lowest (1450 °C). The values for barium phosphate (1850 °C) and barium silicate (1980 °C) are significantly higher, with the highest being those for barium molybdate (2050 °C), barium molybdovanadate (2050 °C) and barium molybdophosphate (2150 °C). Barium molybdovanadophosphateand barium molybdovanadosilicate have Tapp values of about 1700 °C. The results of investigations on solutions will be given in a later paper.

KW - Barium determination

KW - Chemical modifier

KW - Electrothermal atomic absorption spectrometry

KW - Molybdate, vanadate and molybdovanadate ions

KW - Volatilisation of solid compounds

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JO - Journal of Analytical Atomic Spectrometry

JF - Journal of Analytical Atomic Spectrometry

SN - 0267-9477

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