For the first time, vanadium of biological origin, extracted from centrifugal fraction of vanadium-storing blood cells of the Ascidia sydneiensis samea species, was characterized as regards its isotopic composition and content of natural radioactive elements potassium (K), thorium (Th) and uranium (U). The natural abundance of vanadium isotopes has been confirmed with high accuracy, thus excluding a possible selectivity within bio-chemical reactions of vanadium concentration in blood cells from seawater. A large potassium concentration (up to 5500 × 10⁻⁶ g g⁻¹) was found in the blood cell samples. The concentration of thorium was determined to be about 30 × 10⁻⁹ g g⁻¹, while the uranium concentration was about 150 × 10⁻⁹ g g⁻¹. Hence, a highly efficient two-stage purification approach with a total vanadium recovery of better than 70% was developed and applied. The final concentrations of K < 100 × 10⁻⁶ g g⁻¹ and of U/Th < 0.5 × 10⁻⁹ g g⁻¹ in the purified vanadium-containing samples were achieved. Vanadium extracted from centrifugal fraction of vanadium-storing blood cells after two-stage purification approach could be utilized in various applications, where a high chemical purity compound is required. However, to be used as a source of radiopure vanadium in ultra-low-background experiment aimed to search for ⁵⁰V beta decay, it should be further purified by Electron Beam Melting against residual potassium.

首次从Scidia sydneiensis samea物种的储钒血细胞离心级分提取的生物来源钒的同位素组成和天然放射性元素钾（K），th（Th）和铀（U）。钒同位素的天然丰度已经得到了高精度的确认，因此排除了海水中血细胞中钒浓度的生化反应中可能存在的选择性。在血细胞样本中发现钾浓度高（高达5500×10 ^-6  g g ^-1）。or的浓度确定为约30×10 ^-9  g g ^-1铀浓度约为150×10 ^-9  g g ^-1。因此，开发并应用了总钒回收率优于70％的高效两步纯化方法。在纯化的含钒样品中达到了K <100×10 ^-6  g g ^-1的最终浓度和U / Th <0.5×10 ^-9  g g ^-1的最终浓度。经过两阶段纯化方法后，从储钒血细胞的离心级分中提取的钒可用于需要高化学纯度化合物的各种应用中。然而，在旨在寻找^50的超低本底实验中用作放射纯钒的来源Vβ衰变，应通过电子束熔化法对残留的钾进一步纯化。