Direct graphite furnace atomic absorption spectrometric determination of metals in sea water: application of palladium modifiers and a fractal approach to their analytical support
✍ Scribed by Stefan Sachsenberg; Thomas Klenke; Wolfgang E. Krumbein; Hans J. Schellnhuber; Erich Zeeck
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 937 KB
- Volume
- 279
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
ea water, like other high-salinity matrices, causes severe interferences in the direct determination of metals by graphite furnace atomic absorption spectrometry (GFAA ), even when Zeeman-effect background correction is applied. A method for eliminating these interferences by the application of mixed modifier system of ammonium oxalate and tetraamminepalladium(II) chloride is presented . In particular these modifiers optimize the direct GFAA determination of lead and manganese . For cadmium, however, only ammonium oxalate should be used as a modifier. The geometry of the microdistribution of palladium on the palladium-conditioned graphite platform was investigated in order to elucidate possible stabilizing effects of palladium on the analytes which were observed with the different modifiers . Fractal characteristics of the palladium elemental distribution were ascertained by a scanning electron microscope-energy-dispersive x-ray spectrometer image box-counting analysis . The fractal dimension [D B(O) = 1.77 ± 0 .04 and 1 .81 ± 0.04] and electron microscopic investigations indicated differences in the structure of palladium deposits on the platform. These variations in the palladium geometry affect the analytes to a certain extent.