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新显色剂三溴偶氮-5-溴膦(5-BPA-TB),是吸光光度法测定铈组稀土元素的优良试剂;在0.4N HClO_4介质中,用丙酮抑制重稀土元素,它可测定铈组稀土元素,与铈组稀土元素形成的配合物最大吸收波长为638nm,摩尔吸光系数ε=1.29×10_5·L·mol~(-1)·cm~(-1);桑德尔灵敏度为S=10.9×10~(-1)·μg·cm~(-2)。铈、镧或混合铈组稀土元素在0～12.5μg/25ml范围内遵守比耳定律,在此范围内允许6倍量的钇组稀土元素存在,大多数共存离子允许量达2～20mg,常见掩蔽剂的允许量亦大。方法简便、快速、灵敏,特效。
The new reagent tribromoazo-5-bromophosphine (5-BPA-TB) is an excellent reagent for spectrophotometric determination of rare earth elements in cerium group. In 0.4N HClO 4 medium, heavy rare earth elements The maximum absorption wavelength of the rare earth elements in the cerium group and the rare earth elements in the cerium group was 638 nm, the molar absorptivity ε = 1.29 × 10 -5 L · mol -1 cm -1, the sensitivity of Sander was S = 10.9 × 10 -1 μg · cm -2. The rare earth elements of cerium, lanthanum or mixed cerium group comply with Beer’s law within the range of 0 ~ 12.5μg / 25ml, allowing six times the amount of rare earth elements in the yttrium group within this range. Most of the coexisting ions allow 2 ~ 20mg, The amount of masking agent is also large. Method is simple, fast, sensitive, special effects.