A thermogravimetric analysis study of volatilization of flux mixtures used in XRF sample preparation

Department of Chemistry, University of Pretoria, Πρετόρια/Πόλη του Ακρωτηρίου, Gauteng, South Africa
X-Ray Spectrometry (Impact Factor: 1.35). 05/2004; 33(3):212 - 215. DOI: 10.1002/xrs.700


This paper deals with the thermal behaviour occurring during the formation of lithium borate glasses. Thermogravimetric analysis and differential scanning calorimetry were employed to identify reactions occurring during fusion in pure flux mixtures. The conditions around the identified reactions were reproduced in a muffle furnace to obtain larger quantities of material for further investigation using spectroscopic techniques. It was shown that above 1050°C lithium borate fluxes volatilize, which could lead to inaccurate analytical results. Copyright © 2004 John Wiley & Sons, Ltd.

Download full-text


Available from: Christien A. Strydom, Jan 20, 2014
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: This is the eighteenth annual review published in JAAS of the application of atomic spectroscopy to the chemical analysis of environmental samples. The review follows on directly from last year's (J. Anal. At. Spectrom., 2002, 17, 284-317), and once again uses the revised format which includes less tabulated material. It was recognized by the review group that some of the tables were becoming less comprehensive and that this form of information was better and more easily obtained using electronic searches. We therefore critically report on the most important developments in environmental analysis during the review period, and tend to focus on improvements to existing techniques that provide more reliable and robust analytical methods. Comments on these changes and possible improvements for future reviews will be welcomed by the review coordinator.
    Full-text · Article · Jan 2003 · Journal of Analytical Atomic Spectrometry
  • [Show abstract] [Hide abstract]
    ABSTRACT: During lithium tetraborate fluxing, chromite undergoes incongruent dissolution, in which high proportions of aluminium, magnesium and titanium are dissolved in the flux while some iron remains behind in a residual chromium-rich phase. Increasing the time and flux/sample ratio improve the dissolution of chromite. Errors in XRF analysis due to incomplete dissolution of chromite in lithium tetraborate flux will have the largest effects for chromium and lesser, although still serious, effects for iron. Copyright © 2004 John Wiley & Sons, Ltd.
    No preview · Article · May 2004 · X-Ray Spectrometry
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: This annual review of X-ray fluorescence covers developments over the period 2004–2005 in instrumentation and detectors, matrix correction and spectrum analysis procedures, X-ray optics and microfluorescence, synchrotron XRF, TXRF, portable XRF and on-line applications, as assessed from the published literature. The review also covers a survey of applications, including sample preparation, geological, environmental, archaeological, forensic, biological, clinical, thin films, chemical state and speciation studies. As was remarked on in last year’s review, substantial numbers of papers continue to be offered in the areas of environmental, industrial and biological/clinical applications, indicating the continued importance of XRF in these fields. Furthermore, several papers have risen to the challenge presented by EU directives in the recycling of waste (not the least plastic and related materials), landfill issues with the literature in general reflecting the growing contribution that XRF can make to these studies. There has, furthermore, been a continued growth in the application of portable XRF techniques, including, remarkably, both portable synchrotron and portable TXRF instrumentation. Interest continues in the development of silicon wafer based devices, including the silicon drift detectors, CCDs and other nanostructural arrays. These developments demonstrate the current prominence and potential for further growth of XRF in the modern analytical sciences.
    Full-text · Article · Oct 2005 · Journal of Analytical Atomic Spectrometry
Show more