摘要
研究了新显色剂2,6-二溴-4-氟偶氮氟膦（偶氮氟膦-DBF）与稀土元素的显色反应.在乳化剂OP及乙醇存在下,在0.06 mol/L的H2SO4介质中,试剂与15种稀土发生显色反应,形成稳定的蓝色配合物.稀土镧与试剂的配合比为1：3,各稀土配合物的表观摩尔吸光系数ε为0.75～1.13×10^5 L·mol^-1·cm^-1, 最大吸收波长位于632～635 nm.混合稀土元素质量浓度在0～0.60 μg/mL范围内符合比尔定律.加入四元混合掩蔽剂,可直接用于实际样品中稀土总量的测定,方法回收率在93.8%～104.3%.
The colour reactions of the new chromogenic reagent 2.5-dibmmo-4-fluoro fluorophosphonazo （fluorophos- phonazo-DBF） with rare earth elements （RE） have been studied. In the medium of 0.06 mol/L sulfuric acid, the chromogenic reagent reacts with 15 rare earth elements to form blue complexes, in the presence of emulsifier OP and ethanol. The molar ratio of lanthanum to reagent is 1 ： 3. The molar absorptivity ε of respective rare earth complex is 0.75 - 1.13 ×10^5 L·mol^- 1·cm^- 1 . The maximum absorption wavelength lies at 632 - 635 nm. The mixed RE content obeys Beer＇s law in the range of 0- 0.60 μg/mL. With the solution of 4 mixed screening agents, the method can be directly applied to the determination of total RE in samples. The recoveries of the method are 93.8% - 104.3%.
出处
《分析试验室》
CAS
CSCD
北大核心
2006年第11期90-92,共3页
Chinese Journal of Analysis Laboratory
