Morgan J W, Golightly D W, Dorrzapf A F
U.S. Geological Survey, 981 National Center, Reston, VA 22092 U.S.A.
Talanta. 1991 Mar;38(3):259-65. doi: 10.1016/0039-9140(91)80045-2.
Effective methods are described for the chemical separation of rhenium, osmium and molybdenum. The methods are based on distillation and anion-exchange chromatography, and have been the basis for rhenium-osmium isotope studies of ore deposits and meteorites. Successful anion-exchange separation of osmium requires both recognition and careful control of the osmium species in solution; thus, distillation of osmium tetroxide from a mixture of sulfuric acid and hydrogen peroxide is preferred to anion-exchange. Distribution coefficients measured for perrhenate in sulfuric acid media are sufficiently high (K(d) > 500) for rhenium to be directly loaded onto an ion-exchange column from a distillation residue and subsequently eluted with nitric acid. Polymerization of molybdenum species during elution is prevented by use of a solution that is 1M in hydrochloric acid and 1M in sodium chloride.
描述了铼、锇和钼化学分离的有效方法。这些方法基于蒸馏和阴离子交换色谱法，并且一直是矿床和陨石铼-锇同位素研究的基础。成功地进行锇的阴离子交换分离需要识别并仔细控制溶液中的锇形态；因此，相对于阴离子交换，从硫酸和过氧化氢的混合物中蒸馏四氧化锇更受青睐。在硫酸介质中测得的高铼酸盐分配系数足够高（K(d)>500），使得铼能够直接从蒸馏残渣加载到离子交换柱上，随后用硝酸洗脱。通过使用1M盐酸和1M氯化钠的溶液可防止洗脱过程中钼形态的聚合。
