论文部分内容阅读
在中性及微碱性溶液中,稀土与(口底)唑(STA)、溴化十六烷基三甲铵(CTMAB)形成红色三元络合物,其最大吸收峰位于570nm(仅铈为580nm),摩尔吸光系数为6.1-8.4×10~4。三元络合物中Ce:STA=1:3,La(Y,Yb):STA=1:2.鉴于在pH6.8并加大CTMAB的用量(使〔CTMAB〕/〔RE〕>600)时,镧、镨、钕的三元络合物受到抑制。而铈及重稀土络合物的吸光度降低甚少,提出了不需将铈氧化的直接测定镧中千分之几含量铈及轻稀土混合物中铈的简便分析方法,也可用于镧-镱、钕-钇二元混合物中镱和钇的测定。
In neutral and slightly alkaline solutions, rare earths (STA) and cetyltrimethylammonium bromide (CTMAB) formed a red ternary complex with a maximum absorption peak at 570 nm 580nm), molar extinction coefficient of 6.1-8.4 × 10 ~ 4. In the ternary complex, Ce: STA = 1: 3 and La (Y, Yb): STA = 1: 2. In view of the increased amount of CTMAB at pH 6.8 and the increase of [CTMAB] / [RE]> 600, , The ternary complex of lanthanum, praseodymium and neodymium is suppressed. The cerium and heavy rare earth complexes with little reduction in the absorbance, proposed without cerium oxide direct determination of a few thousandths of Lanthanum content of cerium and light rare earth mixture of cerium simple analysis method can also be used for lanthanum - ytterbium, Determination of ytterbium and yttrium in neodymium - yttrium binary mixtures.