Vanadium isotopic composition of the sea squirt (Ciona savignyi) |
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| Authors: | Masao Nomura Mana Nakamura Ryosuke Soeda Yoshikazu Kikawada Michiko Fukushima |
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| Institution: | 1. Research Laboratory for Nuclear Reactors , Tokyo Institute of Technology , Tokyo , Japan;2. Faculty of Science and Technology , Sophia University , Tokyo , Japan;3. Ishinomaki Senshu University , Miyagi , Japan |
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| Abstract: | Vanadium (V) in the sea squirt (Ciona savignyi) from Onagawa Bay, Miyagi, Japan, was isolated and purified through adsorption on a diamine resin and anion and cation exchanges after the dissolution of sea squirt samples with nitric acid and hydrogen peroxide. The 50V/51V isotope ratio of V thus obtained was mass-spectrometrically determined to be from 2.51×10?3 to 2.55×10?3 with the average of 2.53×10?3 by the thermal ionisation technique. This value agreed with those of vanadyl chloride and vanadyl nitrate both prepared from vanadyl sulphate (Wako Pure Chemical Industries, Ltd., Japan) and of V in coastal seawater (Shimokita Peninsula, Aomori, Japan) within experimental uncertainties (standard deviation of±0.04), which suggested that no appreciable V isotope fractionation occurs accompanying V uptake by the sea squirt from sea water. |
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| Keywords: | biological metal uptake heavy isotopes isotope fractionation isotope measurements methods and equipment sea squirt thermal ionisation technique vanadium-50 |
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