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着重研究了锰结核样品中Pa的分离条件,建立了~(231)Fa分离的流程。锰结核样品加入示踪剂~(232)U-~(228)Th和~(233)Pa,在 0.05 mol/l HF 存在下用盐酸和硝酸溶解,离心除去不溶残渣,溶解液蒸干用1mol/l HNO_3提取,在pH=7 下使 Fe(OH)_3 沉淀后进行Th-Pa-U 的离子交换色层分离。Pa用 0 mol/l HCl+0.05 mol/l HF 洗脱,洗脱液用0.5 mol/l TTA-苯萃取纯化和制源,比较了~(231)Fa α能谱法和α计数法测试的结果,实测了一个碳酸盐标准样品的~(231)Fa/~(235)U 法年龄为(85±10)×10~3 y与~(230)Th/(234)u法的平均年龄(84±4)×10~3 y 是一致的。Pa的化学回收率为78～86％。
The separation conditions of Pa in manganese nodules were emphatically studied, and the procedure of ~ (231) Fa separation was established. Manganese (232) U- 228 228 Th and ~ (233) Pa were added into the manganese nodules to dissolve them with hydrochloric acid and nitric acid in the presence of 0.05 mol / l HF, and the insoluble residue was removed by centrifugation. The solution was evaporated to dryness and treated with 1 mol / l HNO_3 extraction, after Fe (OH) _3 was precipitated at pH = 7, ion-exchange chromatography of Th-Pa-U was performed. Pa was eluted with 0 mol / l HCl + 0.05 mol / l HF. The eluate was purified and sourced by 0.5 mol / l TTA-benzene extraction. The results of ~ (231) Fa α spectroscopy and α counting As a result, the average age of the (231) Fa / ~ (235) U method of (85 ± 10) × 10 ~ 3 y and ~ (230) Th / (84 ± 4) × 10 ~ 3 y is consistent. The chemical recovery of Pa is 78-86%.