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本文研究了新显色剂2-(4-氯-2-胂酸苯偶氮)-7-(2,4-三溴苯偶氮)-1,8-二羟基-3,6-萘-二磺酸(CAsA-TB)与钍的显色反应。研究结果表明,在强酸介质中形成稳定的紫红色配合物,最大吸收波长为645nm,表观摩尔吸光系数为1.3×10~5,钍浓度在0～15μg/25ml范围内遵守比耳定律。反应的选择性好,铀、钛、重稀土的选择性大,常见金属元素如钙、镁、铁、镉、镍、钴、铜、钡、钼等均不干扰测定。用于钨钍合金中微量钍的测定,结果满意。
In this paper, the new color reagent 2- (4-chloro-2- arsinate phenylazo) -7- (2,4-tribromophenylazo) -1,8-dihydroxy- Color Reaction of Disulfonic Acid (CAsA-TB) with Thorium. The results show that the stable magenta complex formed in strong acid medium has a maximum absorption wavelength of 645nm, an apparent molar absorptivity of 1.3 × 10 ~ 5, and a thoron concentration of 0 ~ 15μg / 25ml. The selectivity of the reaction is good. The selectivity of uranium, titanium and heavy rare earths is large. Common metal elements such as calcium, magnesium, iron, cadmium, nickel, cobalt, copper, barium and molybdenum do not interfere with the determination. Tungsten thorium alloy for the determination of trace amounts of thorium, with satisfactory results.