title: Vanadium isotopic composition of the sea squirt (Ciona savignyi).
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 (50)V/(51)V 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.
authors.affiliation: aResearch Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo, Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Nomura
authors.forename: Mana
authors.initials: M
authors.lastname: Nakamura
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Soeda
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Kikawada
authors.forename: Michiko
authors.initials: M
authors.lastname: Fukushima
authors.forename: Takao
authors.initials: T
authors.lastname: Oi
mesh_terms: D000818:Animals; D006861:Hydrogen Peroxide / Q000032:analysis; D007554:Isotopes / Q000032:analysis; D007564:Japan; D012623:Seawater; D014561:Urochordata / Q000737:chemistry*; D014639:Vanadium / Q000032:analysis*; D017968:Vanadium Compounds / Q000032:analysis
chemical_list: D007554:Isotopes; D017968:Vanadium Compounds; D014639:Vanadium; C034028:vanadyl sulfate; D006861:Hydrogen Peroxide