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本文提出在铈组稀土元素存在下,用5-Br-PADAP 光度法测定钇组稀土元素。探讨和选择了最佳反应条件和络合物的组成,找出了对铈组稀土元素和干扰元素的消除方法。在钇组稀土-SSA(Phen)-NH_4F(NaHCO_3)-乙醇等新的配位体系中,抑制了钇组稀土元素的反应差异,选择性地测定钇组稀土元素。其最大波长为575nm,克分子吸光系数1.3×10~5。用于稀土球墨铸铁、合金钢和矿石中微量钇组稀土的测定,获得满意的结果。
This paper presents the determination of rare earth elements in the yttrium group by 5-Br-PADAP spectrophotometry in the presence of rare earth elements in the cerium group. The optimum reaction conditions and composition of the complex were discussed and selected, and the methods for eliminating rare earth elements and interfering elements in the cerium group were found out. In the new coordination system of yttrium group, such as rare earth-SAA (Phen) -NH_4F (NaHCO 3) -ethanol, the rare earth elements in the yttrium group were selectively inhibited by the difference of rare earth elements reaction. The maximum wavelength is 575nm, the molecular absorption coefficient 1.3 × 10 ~ 5. For rare earth ductile iron, alloy steel and ore trace yttrium group of rare earth determination, to obtain satisfactory results.