ABSTRACT
This paper presents the possibilities of separation of yttrium(III)-neodymium(III) and samarium(III)-neodymium(III) pairs by frontal analysis on strongly basic anion-exchangers Wofatit SBW, Wofatit SBK and Lewatit MP 5080 in the systems: 90% (v/v) 2-propanol-10% (v/v) 7 M HNO3 and 90% (v/v) 1-propanol-10% (v/v) 7 M HNO3. The best results are obtained on Lewatit MP 5080 in the 90% (v/v) 2-propanol-10% (v/v) 7 M HNO3 system. In this system, on 1 dm3 of this anion-exchanger, 1.95 kg yttrium(III) and 0.3 kg samarium(III) were purified decreasing the microcomponent content to below 10(-3)%.
Subject(s)
1-Propanol/chemistry , Anion Exchange Resins , Metals, Rare Earth/isolation & purification , Nitric Acid/chemistryABSTRACT
PIP: "We analyse here the household situation of the elderly in Switzerland.... The situation at the beginning of the '90s is described in the different age groups of the second part of the lifecourse and in reference to individual profiles. In a second step, this information is considered in the light of the evolution which occurred during the last thirty years.... The objective is to examine in what measure elderly people are also affected by the new lifestyles shown in particular in the diversification of the household arrangements. More broadly, the aim is to contribute to a better understanding of the current mutations of the elderly's position in the family and in the society." (EXCERPT)^ieng