Uranium Distribution in Mineral Phases of Rock by Sequential Extraction Procedure
Uranium Distribution in Mineral Phases of Rock by Sequential Extraction Procedure
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通过顺序提取程序测定岩石矿物相中的铀分布
DOI：
10.1524/ract.1991.5253.2.387
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
P. Duerden
中科院分区：
文献类型：
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作者：
N. Yanase;T. Nightingale;T. Payne;P. Duerden
采用连续提取程序研究了Koongarra铀存款（澳大利亚北领地）岩石矿物相中铀的分布。这项工作是由经合组织/国家环境局赞助的国际鳄鱼河流栖息地项目中进行的自然模拟研究的一部分。以下矿物相：吸附的痕量物质和碳酸盐矿物、无定形铁矿物和次生铀矿物、结晶铁矿物、粘土矿物和剩余的抗性矿物相分别通过用以下物质处理而被连续提取：1 M乙酸钠（pH = 5）（Morgan溶液）、Tamm酸性草酸盐（TAO）（pH = 3）、柠檬酸盐-连二亚硫酸盐碳酸氢盐（CDB）、6 M盐酸和熔融。Koongarra次生矿体样品中的大部分铀包含在结晶铁矿物中（42 - 60%）。在原生矿体中，铀在矿物相之间的分布随深度而变化。约70%的总铀与Tamm的可萃取矿物相结合，在风化区的钻孔DDH 1（19.4-20.5米）。在DDH 2钻孔的较深区域（33.0 - 34.3米），大部分铀可用6 M HCl萃取。根据238 U经23 Th衰变到23 U时产生的α反冲效应，讨论了各萃取过程中234 U/238 U的活度比。
A sequential extraction procedure was used to study the distribution of uranium in mineral phases of rock at the Koongarra uranium deposit (Northern Territory of Australia). This work forms a part of the natural analogue study carried out in the International Alligator Rivers Analogue Project, which is being sponsored by the OECD/NEA. The following mineral phases: adsorbed trace material and carbonate minerals, amorphous iron minerals and secondary uranium minerals, crystalline iron minerals, clay minerals, and remaining resistant mineral phases, were extracted successively by treatment with: 1 Μ sodium acetate (pH = 5) (Morgan's solution), Tamm's acid oxalate (TAO) (pH = 3), citrate-dithionitebicarbonate (CDB), 6 Μ hydrochloric acid, and fusion respectively. The majority of uranium in samples from the secondary ore body at Koongarra was contained in crystalline iron minerals (42 — 60%). In the primary ore body, the uranium distribution between mineral phases varies with depth. About 70% of the total uranium was incorporated with the Tamm's extractable mineral phases, in the weathered region of the drill hole DDH1 (19.4-20.5 m). In the deeper region of the drill hole DDH2 (33.0 — 34.3 m), most of the uranium was extractable with 6 Μ HCl. The 2 3 4 U/ 2 3 8 U activity ratios in each extraction are discussed on the basis of the alpha recoil effect, which occurs with the decay of 2 3 8 U through 2 3 Th to 2 3 U.