کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6437036 | 1637674 | 2011 | 8 صفحه PDF | دانلود رایگان |
Synchrotron radiation-induced X-ray fluorescence (SR-XRF) spectrometry was applied to determine iodine concentrations in alluvial Pt-Pd aggregates with delicate morphological features from Córrego Bom Sucesso, Minas Gerais, Brazil. The millimetre-sized botryoidal and rod-shaped grains of alluvial Pt-Pd-Hg intermetallic compounds have surprisingly high concentrations of iodine, in the range from 10 to ~ 120 μg/g. Because iodine is a strongly biophile element, known to be enriched in peatlands and plant remains in soils by microbial activity, its concentration in the Pt-Pd nuggets suggests biogenic precious-metal fixation in the aqueous alluvial milieu. Biogenic and inorganic processes, such as bioreduction and electrochemical metal accretion, could mutually have contributed to the growth of nanoparticles, formed on organic templates, to millimetric Pt-Pd nuggets.
Research HighlightsâºIodine found in alluvial Pt-Pd nuggets using synchrotron radiation-induced X-ray fluorescence. âºIodine contents are in the range between 10 and ~ 120 μg/g. âºSuch an iodine enrichment suggests biogenic precious-metal fixation.
Journal: Chemical Geology - Volume 281, Issues 1â2, 2 February 2011, Pages 125-132