1991 年 7 巻 5 号 p. 789-792
An analytical method for the determination of plutonium in plant materials has been investigated. Plutonium was separated from sample solutions by using two anion-exchange columns. In the first stage, the higher valent plutonium Pu(IV, V, VI) in the sample solution was reduced to trivalent plutonium in the presence of sulfurous acid in a 6M hydrochloric acid solution; the trivalent plutonium was then separated from some metallic ions by using anion-exchange column. Next, the trivalent plutonium was oxidized to quadrivalent plutonium in the presence of hydrogen peroxide in a 9M hydrochloric acid solution; the quadrivalent plutonium was adsorbed on another anion-exchange column. Column was washed with 9M hydrochloric acid, and then with an 8M nitric acid solution; the plutonium on the resin was then eluted with a diluted hydrochloric acid solution containing sulfurous acid. In the final stage, plutonium was electrodeposited on a stainless-steel disk together with the molybdenum carrier. By this method, the recovery rate of plutonium in the sample solution was 97.0±3.4% in seven repeated experiments. In addition, plutonium-238 and plutonium-239+240 in several kinds of herbs imported to Japan from Europe were determined.
