锰结核中^(231)Pa分离测定法的研究  

A Study on the Method for Separation and Determination of Pa-231 from Manganese Nodules

作　　者：郑爱榕[1] 施文远[1] 黄奕普[1] 

机构地区：[1]厦门大学海洋学系

出　　处：《厦门大学学报（自然科学版）》1989年第5期527-532,共6页Journal of Xiamen University：Natural Science

摘　　要：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 conduction for Pa from inanganese nodules has beea studied and a procedure has been established for separation and determination of Pa.After adding U232-Th223 and Pa-233 as tracer manganese nodule samples are dissolved with HC1 and HNO3 in the presence of 0.05mol/l HF, and centifuged to isolate insoluble residues off. Dissolved solution is then eraporaed to dryness and taken up with 1 mol/1 HNO3, Subsequently Th, Pa, U are coprecipitaed by Fe(OH)3 at pH=7, and separoted on the anion exchanger column. Protactinium is eluted with 9 mol/l HF and purified by extraction into 0.5mol TTA (2-theaoyltrifluroacetone) in benzene. Alpha thin source is made by dropping organic phase onto heated stainless steel plate and measured by Alpha spectrometry. Results obtained were compared with those of alpha-counting. Pa-231 of a statdard carbonate sample was determina ted. The age [(85±10)×103 yr] calculated by Pa-23l/U-235 method is agree well with that [(84±4) ×103 yr] by Th-230/U-234 method. The chemical yileda. of Pa range from 77 to 86%.

关 键 词：锰结核 PU 分离 测定 

分 类 号：P744.3[天文地球—海洋科学]