X-ray fluorescence analysis (XRF)
Being an accredited and independent testing laboratory looking back on more than 20 years of experience in this field...… we offer all the state-of-the-art preparation and analytical techniques for quantitative and semi-quantitative X-ray Fluorescence Analysis of a wide range of different materials for up to 70 elements.
Key characteristics of this process are:
- Different preparation techniques (fused beads, pressed powders, non-destructive measurements)
- Fast and reliable analyses – if requested performed on-the-spot - of extreme precision and accuracy down to the level of trace elements
- Wide scope of different elements (up to 70) ranging from fluorine to uranium in one single measurement run
- Suitable for the monitoring of products and raw materials. Analysis of unknown materials.
Wave-length dispersive X-ray Fluorescence Analysis (XRF) – How does it work?
Our AXIOS - X-ray fluorescence spectrometer
X-ray fluorescence analysis (XRF) involves the emission of the characteristic fluorescent X-rays of the atoms of reference and analysis substances that have been excited by the discrete spectrum and the 'bremsspectrum' of an X-ray tube.
The radiation emitted by the sample is monochromatised and split up by the analyser crystals in the spectrometer so that the intensities of individual spectral lines and/or regions can actually be measured (wavelength dispersive X-ray spectrometry, WDX).
Following corrections for matrix effects and line overlaps, the line intensity of an element represents a measure of the concentration of that element.
Our scope of services
Quantitative analysis of a fused bead for 12, 16, 20 or 40 elements
For the analysis of oxidic and oxidisable samples composed of a wide range of different materials such as, for instance, glass and glass fibres, soils, rock, mineral raw materials, ceramic or mineral-bonded construction materials etc.
This process involves adding a flux (lithium tetra borate) to the sample material, followed by fusing in an oxidizing atmosphere after which the sample is rapidly cooled down to form a homogenous fused bead, which is then analysed with utmost precision.
Determination of carcinogenicity index (CI)
in accordance with BIA Procedure 7488 on the classification of man-made mineral fibres with respect to their carcinogenic potential as defined in TRGS 905 and the Gefahrstoffverordnung (Ordinance on Hazardous Substances)
Quantitative analysis of a pressed powder pellet for 27, 40 or 50 elements
Especially suitable for environmentally relevant samples such as, for instance, contaminated or non-contaminated soil, clarifier sludge, refuse incineration residues, but also REA gypsum, fly ash and other material. Owing to the type of preparation, texture and grain size effects may cause identification errors of the light main elements with atomic ordinal numbers up to 15. As a minimum and for the sake of completeness, the elements ranging from Na through to Si should also be analyzed by fusion.
Production of a pressed powder pellet for X-ray fluorescence analysis
The 27-element software program is especially suitable when dealing with problems for which a specific range of elements need to be analysed, such as the LAGA or the Kloke lists, the Sewage Sludge Ordinance, or EC Directives. In environmental toxicology, however, a large number of additional elements exist which are not captured in these lists of limits, standard and reference values.
In the event of suspected contamination with any such elements or when producing soil cadastres, we recommend that a more comprehensive software program capable of 40 or 50 elements be used.
In all the above cases, the material is carefully prepared as follows: the sample is dried in a recirculating-air drying cabinet at a temperature of 40o
C to prevent vapour losses of volatile metallic or metal-organic mercury compounds, for example, and then ground in an agate mill, unless this has already been done before supplying the material.
Screening analysis for 70 elements
The fundamental parameter procedure IQ+ provides a matrix-independent, quantitative, semi-quantitative or qualitative overview of the elements of unknown samples with a variety of material properties and different compositions. Samples can be analysed either after preparation or, if its composition (i.e. X-ray resistant and vacuum stable!) and surface quality allows it, without preparation and by non-destructive means. This enables us to determine element concentrations between the minimum detection limit and 100%.
This procedure is ideally suited to test conformity with RoHS
according to Directive 2002/95/EC
or the corresponding standard on analytical test methods DIN EN 62321 [E]