Identification of condensed-phase species on the thermal transformation of alkaline and alkaline earth metal sulphates on a graphite platform

D. Littlejohn, M.A. Castro, K.J. Faulds, W.E. Smith, A.J. Aller

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Thermal treatment of alkaline and alkaline earth metal sulphates on a graphite platform was performed over the temperature range 200–2000 °C. The solid residues produced at each temperature were located by scanning electron microscopy (SEM) and then identified by energy-dispersive (ED) X-ray spectroscopy and Raman microanalysis. Additional experiments involved the dissolution of the residues from the platform and analysis by ion chromatography to determine the concentration of sulphate and other ions. A decomposition pattern was derived for the alkaline and alkaline earth metal sulphates. The transformation of the metal sulphates was dependent on temperature and the cation present. In general, the metal sulphates do not undergo significant decomposition to other species at temperatures less than 900 °C, with the exception of magnesium and beryllium sulphates, which are transformed into metal oxides to some extent. Above 900 °C, major transformations occur mainly for sodium, magnesium, and beryllium sulphates. For all the salts studied, there is evidence of the formation of species such as metal sulphides and elemental sulphur.
LanguageEnglish
Pages827-39
Number of pages13
JournalSpectrochimica Acta Part B-Atomic Spectroscopy
Volume59
Issue number6
DOIs
Publication statusPublished - 2004

Fingerprint

Alkaline Earth Metals
Alkaline earth metals
alkaline earth metals
Graphite
Sulfates
sulfates
platforms
graphite
Metals
Magnesium Sulfate
magnesium sulfates
Beryllium
beryllium
Decomposition
Ion chromatography
Magnesium
Temperature
Sulfides
metals
Sulfur

Keywords

  • electrothermal atomic absorption spectrometry
  • platform vaporization
  • sulphates salt decomposition
  • scanning electron microscopy

Cite this

@article{09db4c8ebe6f41a18b2d63782be14e7b,
title = "Identification of condensed-phase species on the thermal transformation of alkaline and alkaline earth metal sulphates on a graphite platform",
abstract = "Thermal treatment of alkaline and alkaline earth metal sulphates on a graphite platform was performed over the temperature range 200–2000 °C. The solid residues produced at each temperature were located by scanning electron microscopy (SEM) and then identified by energy-dispersive (ED) X-ray spectroscopy and Raman microanalysis. Additional experiments involved the dissolution of the residues from the platform and analysis by ion chromatography to determine the concentration of sulphate and other ions. A decomposition pattern was derived for the alkaline and alkaline earth metal sulphates. The transformation of the metal sulphates was dependent on temperature and the cation present. In general, the metal sulphates do not undergo significant decomposition to other species at temperatures less than 900 °C, with the exception of magnesium and beryllium sulphates, which are transformed into metal oxides to some extent. Above 900 °C, major transformations occur mainly for sodium, magnesium, and beryllium sulphates. For all the salts studied, there is evidence of the formation of species such as metal sulphides and elemental sulphur.",
keywords = "electrothermal atomic absorption spectrometry, platform vaporization, sulphates salt decomposition, scanning electron microscopy",
author = "D. Littlejohn and M.A. Castro and K.J. Faulds and W.E. Smith and A.J. Aller",
year = "2004",
doi = "10.1016/j.sab.2004.04.002",
language = "English",
volume = "59",
pages = "827--39",
journal = "Spectrochimica Acta Part B-Atomic Spectroscopy",
issn = "0584-8547",
number = "6",

}

TY - JOUR

T1 - Identification of condensed-phase species on the thermal transformation of alkaline and alkaline earth metal sulphates on a graphite platform

AU - Littlejohn, D.

AU - Castro, M.A.

AU - Faulds, K.J.

AU - Smith, W.E.

AU - Aller, A.J.

PY - 2004

Y1 - 2004

N2 - Thermal treatment of alkaline and alkaline earth metal sulphates on a graphite platform was performed over the temperature range 200–2000 °C. The solid residues produced at each temperature were located by scanning electron microscopy (SEM) and then identified by energy-dispersive (ED) X-ray spectroscopy and Raman microanalysis. Additional experiments involved the dissolution of the residues from the platform and analysis by ion chromatography to determine the concentration of sulphate and other ions. A decomposition pattern was derived for the alkaline and alkaline earth metal sulphates. The transformation of the metal sulphates was dependent on temperature and the cation present. In general, the metal sulphates do not undergo significant decomposition to other species at temperatures less than 900 °C, with the exception of magnesium and beryllium sulphates, which are transformed into metal oxides to some extent. Above 900 °C, major transformations occur mainly for sodium, magnesium, and beryllium sulphates. For all the salts studied, there is evidence of the formation of species such as metal sulphides and elemental sulphur.

AB - Thermal treatment of alkaline and alkaline earth metal sulphates on a graphite platform was performed over the temperature range 200–2000 °C. The solid residues produced at each temperature were located by scanning electron microscopy (SEM) and then identified by energy-dispersive (ED) X-ray spectroscopy and Raman microanalysis. Additional experiments involved the dissolution of the residues from the platform and analysis by ion chromatography to determine the concentration of sulphate and other ions. A decomposition pattern was derived for the alkaline and alkaline earth metal sulphates. The transformation of the metal sulphates was dependent on temperature and the cation present. In general, the metal sulphates do not undergo significant decomposition to other species at temperatures less than 900 °C, with the exception of magnesium and beryllium sulphates, which are transformed into metal oxides to some extent. Above 900 °C, major transformations occur mainly for sodium, magnesium, and beryllium sulphates. For all the salts studied, there is evidence of the formation of species such as metal sulphides and elemental sulphur.

KW - electrothermal atomic absorption spectrometry

KW - platform vaporization

KW - sulphates salt decomposition

KW - scanning electron microscopy

U2 - 10.1016/j.sab.2004.04.002

DO - 10.1016/j.sab.2004.04.002

M3 - Article

VL - 59

SP - 827

EP - 839

JO - Spectrochimica Acta Part B-Atomic Spectroscopy

T2 - Spectrochimica Acta Part B-Atomic Spectroscopy

JF - Spectrochimica Acta Part B-Atomic Spectroscopy

SN - 0584-8547

IS - 6

ER -