Improved technique for quantitative EDXRF analysis of powdered plant samples
✍ Scribed by Martins Stikans; Johan Boman; Eva Selin Lindgren
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 252 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0049-8246
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✦ Synopsis
An improved technique for energy-dispersive x-ray Ñuorescence analysis of powdered plant samples is presented. It is based on the use of a special rotating and moveable sample holder (RMSH). This sample holder provides both controlled rotation and lateral transfer movements of the sample while a measurement is carried out, consequently simulating homogeneous excitation conditions over the sample. In this way it compensates for e †ects caused by the typical inhomogeneous distribution of intensity within the x-ray beam exciting the elements in the sample. The sample consists of powdered dry plant material deposited in an easy way on an adhesive tape, providing a stable layer of plant particles covering the surface. The mean size of the particles Ðxed on the tape results in a thin or intermediate thickness sample, 0.8-2.5 mg cm-2. The application of RMSH provides an easy sample preparation method and improved performance, lowering the detection limits of the measurements and resulting in reproducible, reliable and consistent data.