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近年来对钪—三苯甲烷染料一阳离子表面活性剂的三元络合物研究较为活跃[1],这类显色反应摩尔吸光系数高,一般均在1×10~5以上,但由于在碱性范围内显色,方法的选择性不够理想。对乙酰基偶氮胂是我校合成的新型显色剂,由于它在酸性介质中与稀土、钍、钪产生灵敏的显色反应,形成的络合物十分稳定,其选择性超过一般双偶氮类试剂,目前在生产实际中已得到广泛应用,但对它形成多元络合物的性能尚未进行研究。有关以偶氮胂类显色剂为配体的稀土三元络合物国内文献很少见报导[2]。本文研究了钪—对乙酰基偶氮胂—氯化十四烷基吡啶的三元络合物,其摩尔吸光系数为7.65×10~4,比相应的二元络合物灵敏度提高2倍多,是目前在酸性范围内测定钪灵敏度最高的显色体系。大多数共存元素均可允许毫克量存在,在同样条件下,钇不形成三元络合物,进一步扩大了钪、钇显色反应之间的差别,因而可用于直接光度测定钪,钇铁氧体中的微量钪。
In recent years, the ternary complex of scandium-triphenylmethane dye-cationic surfactant has been relatively active [1]. The molar extinction coefficients of these chromogenic reactions are high, generally above 1 × 10 ~ 5, Alkaline color range, the selectivity of the method is not ideal. Acetylarsenazo is a new color reagent synthesized by our school. Due to its sensitive color reaction with rare earth, thorium and scandium in acidic media, the complex formed by the reaction is very stable and its selectivity is higher than that of general duality Nitrogen reagent has been widely used in the production practice at present, but its performance of forming complex complexes has not been studied. It is seldom reported in the domestic literature about rare earth ternary complex with azo-arsine reagent as ligand [2]. In this paper, the ternary complex of scandium-p-acetylarsenazo-tetradecylpyridinium chloride has a molar absorptivity of 7.65 × 10 ~ 4, which is two times more sensitive than the corresponding binary complex , Is currently the highest sensitivity of scandium in the determination of the acid color system. Most of the coexisting elements allow for the presence of milligram quantities. Under the same conditions, yttrium does not form ternary complexes and further expands the differences between the scandium and yttrium chromogenic reactions and can therefore be used for the direct photometric determination of scandium, yttrium ferrite Scandium in the body trace.