Variation in the relationship between odd isotopes of tin in mass-independent fractionation induced by the magnetic isotope effect.

Experimental results are presented showing the variation in the relationship between odd isotopes of tin (Sn) in mass-independent fractionation caused by the magnetic isotope effect (MIE), which has previously only been observed for mercury. These results are consistent with the trend predicted from the difference between the magnitudes of nuclear magnetic moments of odd isotopes with a nuclear spin. However, the correlation between odd isotopes in fractionation induced by the MIE for the reaction system used in this study (solvent extraction using a crown ether) was different from that reported for the photochemical reaction of methyltin.

Historical changes of U/U and U/U isotopic ratios in Tokyo Bay from the 1960s to the 2000s.

We examine the historical changes of U/U and U/U in a sediment core collected in Tokyo Bay and elucidate the anthropogenic sources of uranium in the 1960s-2000s. Uranium-236 was detected in samples deposited in the 1960s-2000s, and the U/U ratio of the sediment core shows peak values in the 1970s. The U/U isotopic ratios in samples deposited in the early 1960s are almost identical to that of natural uranium, implying that the U might have originated from global fallout.

Temporal change of U/U and U/U isotopic ratios in atmospheric deposition in Tokyo and Akita from 1963 to 1979.

We examine the temporal changes of U/U and U/U in atmospheric deposition from samples collected in Tokyo and Akita from 1963 to 1979 and elucidate the spatial distribution and historical changes of the anthropogenic sources of uranium in Japan. The U/U ratio of atmospheric deposition in Tokyo peaked in 1963 and again during the 1970s, while the corresponding U/U ratios of atmospheric deposition during the second peak period were lower than that of natural uranium. The U/U ratios of atmospheric deposition in Akita samples peaked in 1963.

A simple and rapid method for isotopic analysis of nickel, copper, and zinc in seawater using chelating extraction and anion exchange.

Stable isotope ratios of nickel, copper, and zinc are powerful tools for elucidating the biogeochemical cycling of trace metals in the ocean. However, analytical difficulties have impeded isotopic studies of these metals. We present a simple and rapid method for simultaneous analysis of Ni, Cu, and Zn isotope ratios in seawater using NOBIAS Chelate-PA1 resin and anion exchange resin.