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本文首次研究了稀土元素与新显色剂DBC-偶氮胂在高酸度下的显色反应。在1.7NHCl介质中,轻稀土元素与试剂发生灵敏的显色反应,对鈰的摩尔吸光系数为1.29×10~5L·mol~(-1)·cm~(-1)。由于在高酸度下显色,在选择性方面亦具有较突出的优点,其中铬(Ⅲ)的允许量为8.5mg,超过了同类型的其它双偶氮类试剂,已用于直接光度法测定高温合金中的微量鈰,可以准确分析0.x％—0.00x％的鈰,方法的标准偏差为1.97×10~(-3)-8.37×10~(-5),变异系数为1.008％—4.95％。本文还初步研究了显色反应的机理,测定了络合物的组成。
In this paper, the color reaction of rare earth elements with a new chromogenic reagent DBC-arsine at high acidity was studied for the first time. In 1.7N HCl medium, the light rare earth element reacted with the reagent sensitively. The molar extinction coefficient of cerium was 1.29 × 10 ~ 5L · mol ~ (-1) · cm ~ (-1). Due to its high acidity, it also has outstanding advantages in terms of selectivity. The allowable amount of chromium (III) is 8.5mg, which exceeds that of other disazo agents of the same type and has been used in direct spectrophotometric determination The standard deviation of the method is 1.97 × 10 -3 -8.37 × 10 -5 and the variation coefficient is 1.008% 4.95%. In this paper, the mechanism of the color reaction was also studied. The composition of the complex was determined.