Kamal Mohammad Asad Rashid1,2, H. Roy Krouse1,2
1 N IN4
2Department of Physics, The University of Calgary, Calgary, Alta., Canada
Tóm tắt
During reduction of [Formula: see text] to Se0 by NH2OH•HCl, the selenium isotope selectivity fits a two step model with the second step two orders of magnitude faster than the first. The ratios of the isotopic rate constants, k76/k82, are 1.007 and 1.020 for the first and second steps, respectively. The corresponding k76/k80 values are 1.0046, and 1.0133. During the reduction of [Formula: see text], to H2Se by a H3PO2–HI–HCl mixture, the H2Se was initially enriched but sporadically became depleted in the heavier isotopes as the reaction progressed. This is attributed to the formation of Se0 as an intermediate and the subsequent reaction of its surface layers to produce H2Se.For all data, the relation δ82Se = (1.54 ± 0.02)δ80Se was observed as predicted theoretically.
