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多氨基多羧酸可与稀土离子生成稳定的配合物,EDTA、二乙三胺五乙酸(DTPA)和四乙五胺七乙酸(TPHA)曾用于测定某些单一稀土,但铈(Ⅲ)的测定尚未见报道.本文研究了三乙四胺六乙酸(TTHA)与铈(Ⅲ)的配合物在紫外区的吸收光谱,用导数分光光度法选择测定了混合稀土氧化物中铈的含量。 (一)试剂与仪器 铈(Ⅲ)标准液(1mg/ml):氧化铈(99.99％)溶于硫酸和过氧化氢的混合液中稀释至
Polyaminopolycarboxylic acids can form stable complexes with rare earth ions. EDTA, diethylenetriaminepentaacetic acid (DTPA) and tetraethylenepentamineacetic acid (TPHA) have been used to determine some single rare earths, but cerium (III) Has not been reported yet.In this paper, the absorption spectra of the complexes of triethylenetetraminehexaacetic acid (TTHA) and cerium (Ⅲ) in the ultraviolet region were studied, and the content of cerium in the mixed rare earth oxides was determined by the derivative spectrophotometry. (A) Reagents and instruments Standard solution of cerium (Ⅲ) (1mg / ml): cerium oxide (99.99%) dissolved in a mixture of sulfuric acid and hydrogen peroxide diluted to