Determination of silicon in organic matrices with grazing-emission X-ray fluorescence spectrometry |
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Affiliation: | 1. Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;2. Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA;3. Illinois Sustainable Technology Center, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA;1. Center for Agricultural and Forestry Studies, Research Institute, Universidad del Valle de Guatemala, Guatemala;2. Food Science and Technology Center, Research Institute, Universidad del Valle de Guatemala, Guatemala;3. Biochemical Engineering Center, Research Institute, Universidad del Valle de Guatemala, Guatemala |
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Abstract: | The potential of a prototype grazing-emission X-ray fluorescence spectrometer for reliable analysis of sample solutions, obtained by pressurized microwave oven digestion of Si-spiked organic and biological materials, was investigated as part of an inter-laboratory study. The fact that this grazing-emission technique is based on the total reflection phenomenon and wavelength-dispersive detection, gives it the benefit to determine light elements in a sensitive way. Results of the determination of silicon in pork liver, cellulose, urine, serum, spinach, beer, mineral water and horsetail (dry plant extract) samples are presented. Some of the results are compared with those obtained with other analytical techniques. The study proved that determination of silicon traces in biological matrices represents an extremely difficult task, however, measurements of silicon are achieved with acceptable precision. The most important problems still arise when sample pre-treatment is needed prior to analysis. |
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