Abstract:The reduction of K 2 Cr 2 O 7 solutions by H 2 O 2 was studied by nuclear magnetic resonance (NMR) relaxometry and UV-vis spectroscopy in HCl/KCl buffer (pH 2), NaCl/glycine/HCl buffer (pH 3), and sodium acetate/acetic acid buffer (pH 4). Because of Cr(III) paramagnetism, 1/T 1 and 1/T 2 of the solutions increase during the reduction of diamagnetic Cr(VI). This increase is proportional to the produced Cr(III) concentration. Using different initial H 2 O 2 concentrations, partially reduced Cr(VI) samples were p… Show more
Real-time imaging of free-radical formation by straightforward experimental methods is important in physical chemistry, biochemistry, and radiobiology. Here we show for the first time that the formation of free radicals...
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