Determination of trace europium by adsorptive cathodic stripping voltammetry after complexation with cupferron

This article describes the determination of Eu by adsorptive cathodic stripping voltammetry after complexation with N-nitroso-N-phenylhydroxylamine (cupferron). The accumulation of the complex at the HMDE was performed at 0.0 V and the subsequent potential scan was made in the square wave mode. The analyte signal occurred at −0.88 V. The detection limit is 0.06 nmol dm⁻³. The effect of instrumental and chemical parameters on the peak height and potential was investigated. The same technique can be used for the determination of ytterbium and of the other rare earth elements (REEs) after separation.     

PARTIAL OXIDATION OF METHANE OVER NiO/Al_2O_3 MODIFIED BY METAL OXIDES

ＰＡＲＴＩＡＬＯＸＩＤＡＴＩＯＮＯＦＭＥＴＨＡＮＥＯＶＥＲＮｉＯ／Ａｌ２Ｏ３ＭＯＤＩＦＩＥＤＢＹＭＥＴＡＬＯＸＩＤＥＳ＊ＭｉａｏＱｉｎｇ，ＸｉｏｎｇＧｕｏｘｉｎｇ＊＊，ＸｕＬｉｎｇ，ＳｈｅｎｇＳｈｉｓｈａｎ，ＧｕｏＸｉｅｘｉａｎ（ＳｔａｔｅＫｅｙＬａ...     

稀土离子对氨基酸－茚三酮体系荧光增强作用

进行了稀土氨基酸－茚三酮体系荧光增强作用研究。探讨了不同稀土离子与配体Ｒｕｈｅｍａｎｎ’ｓｐｕｒｐｌｅ作用，生成配合物的荧光增强作用机理和条件。     

电感耦合等离子体质谱法测定高纯氧化钕中稀土杂质的研究

本文报导了高纯氧化钕中Ｙ、Ｌａ、Ｃｅ、Ｐｒ、Ｓｍ、Ｅｕ、Ｇｄ、Ｅｒ、Ｔｍ、Ｙｂ、Ｌｕ等１１中稀土杂质的电感耦合等离子体质谱测定方法。选择了仪器最佳操作参数，研究了质谱干扰和基体效应，采用Ｔ１内标可基本克服基体效应。方法检出限为０．０１９－０．０９５ｎｇ／ｍＬ，加标回收率为８１．８％－１０３．３％。     

环庚三烯酚酮烯土配合物的拉曼光谱研究

本文应用拉曼光谱研究了镧系金属镧、钕、钐和镱与环庚三烯酚酮配合物的配位方式及结构，研究结果表明，金属与环庚三烯酚酮配位后原对应于OH的伸缩振动谱峰消失，同时部分相关的谱峰频率也发生了明显的位移，在低波数400－500cm^-1区间检测到新的谱峰，并且该谱峰的位置随配合物中金属的不同而不同，根据拉曼光谱的研究结果推断了金属与配体的配位方式以及所得稀土金属配合物可能的结构。     

Lanthanide(III) nosylates as new nitration catalysts

Lanthanide(III) nosylates are novel, recyclable catalysts prepared from the noncorrosive and inexpensive p-nitrotoluenesulfonic acid and the corresponding lanthanide(III) oxide. With 5-10% catalyst loading, atom economic nitration of simple aromatic compounds was achieved in good to high yields.     

Magnetic properties of melt-spun Sm2+Y(Co0.8Fe0.1Mn0.1)17BX alloys

Melt-spun ribbons with composition Sm_2+Y(Co_0.8Fe_0.1Mn_0.1)₁₇B_X (X=0–1.0 and Y=0–0.2) were fabricated with a wheel speed of 50 m/s, followed by annealing in the temperature range of 500–800°C for 2.5–60 min. Our results show that all the ribbons annealed up to 800°C are composed of a TbCu₇-type phase as the main phase. The highest coercivity of 8.7 kOe is obtained in a Sm-rich sample with composition Sm_2.2(Co_0.8Fe_0.1Mn_0.1)₁₇ annealed at 750°C for 5 min. It is found that these magnets show a very promising high-temperature performance – much better than those of typical sintered 2 : 17 magnets.     

乙酰丙酮－5，10，15，20－四－对氯苯基卟啉稀土配合物表面光电压谱的研究

采用表面光电压谱法（ＳＰＳ）对乙酰雨酮－５，１０，１５，２０－四－对氯苯基卟啉稀土配合物Ｌｎ（ｐ－Ｃｌ）ＴＰＰａｃａｃ和卟啉配体进行了研究，并对谱带的归属和光电压产生的机制进行了探讨。发现配合物的光伏响应明显小于配体的光伏响应，且随中心离子的不同，其响应也不同。在配合物的ＳＰＳ谱中，除了可看到由配体Ｂ带和Ｑ带吸收所产生的谱带以外，在３００～３５０ｎｍ区出现了一明显的光伏响应带，随稀土中心离子（４ｆ电子数）不同，此光伏响应强度也不同，且随４ｆ电子数而呈规律性的变化。这个谱带可能是由π－π（Ｎ带）跃迁产生的。     

化学富集XRFA法测定岩石、土壤中稀有和稀土元素

研究了化学富集ＸＲＦＡ法测定岩石、土壤中Ｎｂ，Ｔａ，Ｚｒ，Ｈｆ，Ｔｉ，ＲＥ等微量元素的方法。化学富集采用共沉淀与离子交换结合。富集后得到的稀有和稀土元素用薄样－Ｘ荧光光谱法测定。制订了一个用明胶做分散剂制薄样的方法。稀有与稀土元素的检出限达０．０６～０．８μｇ／ｍｌ。精密度与准确度符合地球化学样品分析要求。