Extraction Mechanism of La^3 ＋ from Hydrochloric Acid Solution Using Cyanex 302

The solvent extraction of La3 from hydrochloric acid solutions was investigated using bis (2, 4, 4-trimethylpentyl) monothiophosphinic acid (Cyanex 302, HL) as an extractant. The effect of .equilibrium of aqueous acidity on extraction of La^3 using Cyanex 302 in different diluents was discussed. The effects of extractant concentration and chloride ion on the extraction reaction were also studied. Stoichiometry of the extraction reactions and the nature of metal complexes formed were determined using slope analysis technique and IR measurement.     

照相用硝酸银的提纯

前言感光材料的密度、反差系数、感光度等照相性能是由许多因素决定的。目前乳剂配方、乳剂制备工艺及胶片涂层技术对感光材料的照相性能的影响正受到人们的关注,然而制备感光材料的重要原材料硝酸银,其纯度对照相性能的影响是不可忽视的事实。随着感光材料制备工艺的日益完善,人们将进一步借助提高硝酸银的纯度以期制备性能更优良的感光材料。一些发达国家早已发展这方面工作。研制先进的硝酸银提纯工艺无疑将降低成本并提高硝酸银质量,这对感光材     

镧系元素核磁共振位移试剂的制备

核磁共振波谱是化合物结构分析的强有力的工具。然而谱线的重叠严重地影响了官能团的辨认,从而不能精确地测定化合物的结构。为了解决这一问题,固然可以研制分辨率更高的仪器,但其代价是高昂的。而其     

Mechanism of Thermal Decomposition of Rare Earth Acetate Hydrates

The mechanism of thermal decomposition of rare earth acetate hydrates(Ln(Ac)_3·nH_2O,n=5,forLn=La;n=4,for Ln=Pr→Lu,Y,except Pm)has been studied by TG-DTG,DSC,infrared spectra,X-raydiffraction and chemical analysis.The thermal decomposition reaction consists of two stages,one is dehydrationand the other one is decompostion.The final product is oxide.It has been found that the temperature of pro-ducing anhydrous acetates decreases with increasing atomic number of rare earth elements.The activation ener-gies for dehydration and decomposition reaction of rare earth acetate hydrates have been calculated byFreeman-Carroll and Kissinger method.The dependence of activation energy Jor dehydration reaction on theatomic number of rare earth elements shows“inclined‘W’effect”.The enthalpy changes for dehydration anddecomposition reaction have been determined.     

稀土在荧光免疫分析中的应用

本文概述了稀土在荧光免疫分析中的应用。重点介绍了荧光免疫分析中常用的双功能螯合剂、蛋白质等生物分子的标记以及荧光免疫分析使用的主要测量方法。对其发展前景也提出了看法。     

液体稀土金属及合金的物理和热力学性质

本文评述液体稀土金属、合金的结构特点,介绍了密度,粘度,表面张力等物理性质和热力学性质。     

升溫乙酸銨洗出稀土順序及分离制备高純氧化钇的研究

以乙酸铵为淋洗剂的离子交换法的,自重稀土中分离钇,我国1959年在长春应化所就开展了研究工作;并曾用乙酸铵为淋洗剂,在室温下,成功地分离制备了纯度为99.995%氧化钇。实践证明,乙酸铵为淋洗剂,在室温下,钇与中重稀土能达到有效分离;但产品中氧化钕含量较高,严重地限制了氧化钇的广泛应用。所以,在乙酸铵体系中,使钇与轻稀土达到有效分离,提高氧化钇的质量是急待解决的研究课题。     

高压离子交换色谱及其在稀土元素分离分析上的应用

一、前言 离子交换色谱在许多领域都得到了广泛的应用。但它的最大缺点是分离速度慢,分离时间往往长达几十个小时。怎样提高其分离速度,多年来一直是色谱工作者研究的重要课题。六十年代中期出现了高压离子交换色谱,它是在经典离子交换色谱基础上发展起来的一个新的分离分析技术,从而使古老的离子交换色谱面目为之一新。由于高压离子交换色谱具有快速、高效、操作简便等特点,因而它的发展很迅速,目前已经广泛地应用于许多领域,在许多性质相似或成份复杂的样品的分离分析上发挥了令人瞩目的作用。     

The Thermodynamic Property of Rare Earth Complexes with L-Threonine

In this paper the stability constants and thermodynamic parameters for complexes of rare earth elementswith L-threonine have been measured systematically by potentiometry and calorimetry at 25℃ and ionicstrength of 0.15 mol/L(NaCl).The thermodynamic values for protonation of the anion of L-threonine havebeen obtained.The dependence of stability,enthalpy and entropy change of the complex upon atomic number ofcation is investigated,and the coordination of L-threonine to rare earth is also discussed in detail.     

稀土金属的穆斯堡尔谱研究

本文介绍了稀土元素穆斯堡尔超精细相互作用,评述了稀土金属穆斯堡尔谱研究进展。