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本文研究铈组希土元素(镧、铈、镨、钕、钐)的纸上色层行为,用磷酸三丁酯——二氧六环——硝酸为展开剂,发现1.在一定酸度区间五元素均有双斑存在(经光谱分析证实),五元素双斑存在的区间不同,本文找出了它们存在的区间。2.五元素第二斑点(上升距离较小的斑点)的R_F值有随原子序数增加而增加的规律性,而且在展开剂行程仅为25厘米左右的距离已有显著的差别,但是在低酸度区间不甚明显,钐则不论在高酸度或低酸度区间,其例外现象均较多。3.五元素第二斑点的R_F值随酸度的增加而降低,但是在低酸度区间不明显,钐则不论在高酸度或低酸度区间,其例外均较多。4.五元素第一斑点(上开距离较大的斑点)的变化没有什么规律性,而且面积一般均较第二斑点大得多。
In this paper, the color behavior of paper on the cerium group of rare earth elements (lanthanum, cerium, praseodymium, neodymium and samarium) was studied. Using tributyl phosphate-dioxane-nitric acid as developing solvent, There are two spots of five elements exist (confirmed by spectral analysis), five elements of two spots exist in different intervals, the paper found their existence of the interval. 2. The five elements of the second spot (rising spots smaller spots) R_F value increases with the atomic number increases the regularity, but also in the developing agent travel distance of only about 25 cm have significant differences, but in the low Acidity range is not obvious, samarium regardless of high acidity or low acidity interval, the exception is more. The R_F value of the second spot of five elements decreased with the increase of acidity, but was not obvious in the low acidity interval, while the samarium had more exceptions in the range of high acidity or low acidity. 4. Five elements of the first spot (on the distance from the larger spot) changes have no regularity, and the area are generally much larger than the second spot.