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151.
Yong‐Min Lee Dr. Sunder N. Dhuri Dr. Sarvesh C. Sawant Dr. Jaeheung Cho Dr. Minoru Kubo Dr. Takashi Ogura Prof. Dr. Shunichi Fukuzumi Prof. Dr. Wonwoo Nam Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(10):1803-1806
Give me an “O”! Mononuclear nonheme iron(IV) oxo complexes have been generated using water as an oxygen source and cerium(IV) as an oxidant. The high‐yield oxygenation of organic substrates in this system (see picture, Fe green, O red, N blue, C gray) is catalyzed by iron(II) complexes. The source of oxygen in the iron(IV) oxo complexes and the oxygenated products has been assigned unambiguously by isotopic labeling experiments.
152.
Sangita Dhara Nand Lal Misra Uday Kumar Thakur Dipti Shah R. M. Sawant K. L. Ramakumar Suresh K. Aggarwal 《X射线光谱测定》2012,41(5):316-320
A total reflection X‐ray fluorescence (TXRF) method for the determination of chlorine at trace levels in nuclear fuel samples is described. Chlorine present in trace concentrations in nuclear fuel materials such as U3O8, (U,Pu)C, PuO2 and Pu‐alloys was first separated from the solid matrix by pyrohydrolysis as HCl and was collected in 5 mM NaOH solution. This solution was analyzed for chlorine by TXRF spectrometry using Cl Kα analytical line excited by W Lα. Cobalt was used as internal standard. The precision for such chlorine determination was found to be within 27% (n = 4) when the analysis was carried out in air atmosphere. This could be improved to 8% by making TXRF measurement in flowing helium atmosphere. The results obtained from TXRF determinations were also compared with those obtained from ion chromatography (IC) and were in good agreement. The collection of distillate during pyrohydrolysis in NaOH helped in counterchecking loss of chlorine during TXRF sample preparation. The average deviation of TXRF‐determined values in helium‐purged TXRF measurements with IC determined values (as chloride) was 15% at a chlorine concentration level in the range of 1–70 µg/mL. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献