Initial results are reported on a new microprobe technique for determining ratios in Fe-bearing m... more Initial results are reported on a new microprobe technique for determining ratios in Fe-bearing minerals. The technique is based on the energy shift of a pre-edge peak in X-ray absorption near-edge structure (XANES) spectra obtained using the synchrotron X-ray fluorescence microprobe. A linear relationship between pre-edge peak energy and iron oxidation state was observed for oxide and silicate standards. Reasonable iron oxidation state results were obtained for pallasitic olivine, acmite, altered magnetites and synthetic wüstite. Direct measurements of in coexisting phases is feasible using this technique.
... REFERENCES [1] TM Jans, Flux-weakening regime of an interior permanent-magnet synchronous mo... more ... REFERENCES [1] TM Jans, Flux-weakening regime of an interior permanent-magnet synchronous motor drive, IEEE Transactions on Industry ... Sievert, Prediction of core loss with elliptical flux from measurement with alternating and circular fluxes in electrical steel sheets, ...
Iron though indispensable for the biosynthesis of chlorophyll, its total content in the plant was... more Iron though indispensable for the biosynthesis of chlorophyll, its total content in the plant was not associated with the occurrence of chlorosis. In order to overcome this inconsistency a new technique of plant iron analysis has been developed. It consists of the determination of Fe2+, the fraction of iron involved in the synthesis of chlorophyll. The choice of 1–10 o-phenanthroline (o-Ph) as an extractant for Fe2+ was based on its remarkably higher stability constant for Fe2+ than Fe3+. On this basis, it could preferentially chelate Fe2+. The highly specific organce colour of the Fe2+-phenanthroline complex made possible the determination of Fe2+ by reading the transmittancy at 510 nm. The procedure involves extraction of 2 g of thoroughly washed, chopped, fresh plant by 20 ml of o-phenanthroline extractant (pH 3.0, conc. 1.5%). The plant samples treated with the extractant are allowed to stand for 16 hours and Fe2+ is determined in the filtrate by reading the transmittancy at 510 nm. In sharp contrast to total iron the green plants always contained more Fe2+ than chlorotic plants. The technique has been developed for rice but is expected to be successful for other crops also.
Results are presented of the elemental analysis of iron ore using laser-induced breakdown spectro... more Results are presented of the elemental analysis of iron ore using laser-induced breakdown spectroscopy (LIBS). Calibration curves for calcium, silicon, magnesium, aluminium, and titanium were produced. The precision ranges from≈ 2 to≈ 25%. The detection limits are ...
Initial results are reported on a new microprobe technique for determining ratios in Fe-bearing m... more Initial results are reported on a new microprobe technique for determining ratios in Fe-bearing minerals. The technique is based on the energy shift of a pre-edge peak in X-ray absorption near-edge structure (XANES) spectra obtained using the synchrotron X-ray fluorescence microprobe. A linear relationship between pre-edge peak energy and iron oxidation state was observed for oxide and silicate standards. Reasonable iron oxidation state results were obtained for pallasitic olivine, acmite, altered magnetites and synthetic wüstite. Direct measurements of in coexisting phases is feasible using this technique.
... REFERENCES [1] TM Jans, Flux-weakening regime of an interior permanent-magnet synchronous mo... more ... REFERENCES [1] TM Jans, Flux-weakening regime of an interior permanent-magnet synchronous motor drive, IEEE Transactions on Industry ... Sievert, Prediction of core loss with elliptical flux from measurement with alternating and circular fluxes in electrical steel sheets, ...
Iron though indispensable for the biosynthesis of chlorophyll, its total content in the plant was... more Iron though indispensable for the biosynthesis of chlorophyll, its total content in the plant was not associated with the occurrence of chlorosis. In order to overcome this inconsistency a new technique of plant iron analysis has been developed. It consists of the determination of Fe2+, the fraction of iron involved in the synthesis of chlorophyll. The choice of 1–10 o-phenanthroline (o-Ph) as an extractant for Fe2+ was based on its remarkably higher stability constant for Fe2+ than Fe3+. On this basis, it could preferentially chelate Fe2+. The highly specific organce colour of the Fe2+-phenanthroline complex made possible the determination of Fe2+ by reading the transmittancy at 510 nm. The procedure involves extraction of 2 g of thoroughly washed, chopped, fresh plant by 20 ml of o-phenanthroline extractant (pH 3.0, conc. 1.5%). The plant samples treated with the extractant are allowed to stand for 16 hours and Fe2+ is determined in the filtrate by reading the transmittancy at 510 nm. In sharp contrast to total iron the green plants always contained more Fe2+ than chlorotic plants. The technique has been developed for rice but is expected to be successful for other crops also.
Results are presented of the elemental analysis of iron ore using laser-induced breakdown spectro... more Results are presented of the elemental analysis of iron ore using laser-induced breakdown spectroscopy (LIBS). Calibration curves for calcium, silicon, magnesium, aluminium, and titanium were produced. The precision ranges from≈ 2 to≈ 25%. The detection limits are ...
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