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三溴偶氮氯膦[2-(2-膦酸基-4-氯苯偶氮)-7-(2,4,6-三溴苯偶氮)-1,8-二羟基-3,6-萘二磺酸]是一种新的不对称变色酸双偶氮衍生物,属酸性介质中检测稀土元素的高灵敏度显色剂。在盐酸溶液中,试剂与稀上元素的反应瞬时完成,生成的有色络合物至少可稳定48小时。各稀土元素络合物的最大吸收峰比较集中(642～650nm),摩尔吸光系数亦较相近,即铈、钇组稀土络合物的光吸收性质比较一致。实验证明,大多数常见离子不干扰测定,在适量草酸存在下,可不经分离直接测定钢铁中微量稀土总量;结果满意。
Tribromo Chiorophosphine [2- (2-phosphono-4-chlorophenylazo) -7- (2,4,6-tribromophenylazo) -1,8-dihydroxy-3,6 - naphthalene disulfonic acid] is a new asymmetric chromotropic acid disazo derivatives, is a highly sensitive reagent for detecting rare earth elements in acidic media. In hydrochloric acid solution, the reagent and dilute element reaction completed instantaneously, the resulting colored complex can be stable for at least 48 hours. The maximum absorption peaks of each rare earth complex are concentrated (642-650 nm), and their molar absorptivities are similar, that is, the light absorption properties of rare earth complexes of cerium and yttrium groups are relatively consistent. Experiments show that most of the common ions do not interfere with the determination of the amount of oxalic acid in the presence of direct determination of trace rare earths in steel without separation; the results are satisfactory.