含稀土高炉渣的矿物组成及钍的赋存状态研究

通过偏光显微镜、扫描电镜，对含稀土高炉渣的矿物组成和钍的赋存状态进行了分析研究。结果表明：黄长石、枪晶石、二价金属硫化物、铈钙硅石是构成高炉渣的主要矿物。元素钍存在于稀土矿物中，其自身不能形成独立矿物，而是以类质同像混入物的状态分散于铈钙硅石矿物中。     

用^234Th为产额示踪剂,分光光度法测定环境水中钍的浓度

本文介绍了一种测定环境水中钍浓度的分析方法，１０Ｌ环境水要用氢氧化铁沉淀法浓集钍，阴离子交换树脂除除杂质，分光光度法测定钍浓度，全过程用＾２３４Ｔｈ作为产额示踪剂，进行回收率校正，方法探测下限为１．９×１０＾－５Ｂｑ／Ｌ，回收率均值为（８０．５±４．７）％，用本方法对本省１１个地区的自来水，井水，河水，湖水及温泉水进行了分析，结果表明，各种水样中钍浓度的均值为０．２０～２．６３ｍＢｑ／Ｌ。     

两种测定铀、钍含量方法的比较

用中子活化分析和厚源α－计数两种方法测定了５１个唐三彩马的铀和钍含量，并对结果进行了比较。在采用厚源α－计数法技术来决定铀和钍对标本提供的年辐射剂量时，可以用总α－计数率来计算。     

邻菲啰啉单氮氧化物与硝酸钍形成固态配合物的研究

PhenNO与过渡金属离子具有较好的配位作用,其中某些配合物具有荧光。Th(Ⅳ)与PhenNO的配合物虽有报道,但未涉及其荧光、紫外等性质.我们合成出与文献报道组成不同的配合物Th(PhenNO)_2(NO_3)_4·2H_2O,并对其有关性质进行了研究。荧光性质表明,该配合物具有较强的荧光。     

On the potential use of F2Be-molten-salt for hybrid reactors

Breeder reactors are considered a unique tool for fully exploiting natural nuclear resources. In current Light Water Reactors (LWR), only 0.5% of the primary energy contained in the nuclei removed from a mine is converted into useful heat. The rest remains in the depleted uranium or spent fuel. This evident need to improve resource-efficiency has stimulated interest in Fast-reactors, and with it, boosted the need to answer many of the remaining safety issues attached to such systems (i.e. coolant positive void coefficients). Among the existing candidates to overcome this fundamental drawback, the F₂Be-molten-salt, has proved to feature outstanding neutronic properties. In previous studies, in an analysis that took into account requirements for criticality, for breeding, and for safety, it was demonstrated that a design window could be found in the definition of an F₂Be-cooled system, where the safety requirement was met for a critical breeder reactor.     

A STUDY OF THE SEPARATION AND REFINING OF Ru FROM A MIXTURE OF PLATINUM METALS WITH A TERTIARY AMINE

This paper deals with the separation and refining of Ru from a mixture of platinum metels by solvent extraction with a tertiary amine, Ru of 99.9% purity has been produced with > 90% recovery.     

硝酸钍与2,6-二乙酰吡啶的固态配合物合成及性质研究

一、前 言 由2,6-二乙酰吡啶和二胺类化合物在适当金属离子的模板作用下可缩合成大环,并得到相应的金属含氮大环配合物。关于过渡金属含氮大环配合物的研究已早有报道,近年来人们又相继合成出稀土金属的含氮大环配合物,有关锕系元素含氮大环配合物的研究迄今未见报道。本文试图用模板合成的方法制备钍(Ⅳ)的含氮大环配合物,但未获得成功,当把钍(Ⅳ)盐溶液与2,6-二乙酰吡啶溶液混合时,在适当条件下反应得到了硝酸钍与2,6-二乙酰吡啶的固态配合     

新显色剂二溴羧基偶氮胂分光光度法测定钨合金中的钍

本文介绍了用新显色剂二溴羧基偶氮胂分光光度法测定钨合金中的钍.在0.5mol/L硫酸介质中,钍与新试剂形成蓝紫色配合物,在630nm处具有最大吸收,摩尔吸光系数为1.15×10~5L·mol~(-1)·cm~(-1),配合物的组成为Th:R=1:2.钍量在0～50μg/25ml范围内符合比尔定律.许多常见离子在xmg乃至xxmg时不干扰测定.对钨合金中钍的测定获得了满意结果.     

稀土、铀、钍苦味酸盐与喹哪啶酸氮氧化物配合物的合成与表征

研究了稀土、铀、钍苦味酸盐与喹哪啶酸氮氧化物的配合作用,合成了组成为Ln_2(Pie)_3·(ANO)_3·3H_2O(Ln=La、Pr、Nd、Sm、Eu、Gd、Er、Y;Pic为苦味酸根离子;ANO-为喹哪啶酸氮氧化物阴离子)、UO_2(ANO)_2和Th(Pic)·(ANO)_3·5H_2O的固态配合物,并对配合物的组成,红外、紫外光谱,热稳定性,X射线衍射物相分析及摩尔电导等性质进行了测试和表征。     

Flotation-assisted homogeneous liquid–liquid microextraction for determination of thorium in water samples by inductively coupled plasma–mass spectrometry and Box–Behnken design

A fast, simple, and efficient method for extraction, preconcentration, and determination of thorium in water samples with acceptable recoveries based on flotation-assisted homogenous liquid–liquid microextraction combined with inductively coupled plasma–mass spectrometry (ICP-MS) is presented. Various parameters affecting the extraction efficiency were optimized by Box–Behnken design. Under the optimum conditions (concentration of dimethyl vinyl phosphonate = 2.4 × 10^–4 mol/L, pH = 6.5, n-heptane = 150 μL, and acetonitrile = 0.5 mL), the calibration graph was linear in the range of 10.0–400.0 ng/L for thorium. The limit of detection of this method was 2.62 ng/L, and the enrichment factor was estimated to be 136 for thorium.