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对氯偶氮氯膦(CPA-P-Cl)的合成方法及其与钇的光度性能研究已有报道。本文在此基础上研究了CPA-P-Cl与钇组稀土元素的显色条件。在乙酸-乙酸钠介质中,CPA-P-Cl与钇组稀土生成稳定的β-型络合物,最大吸收峰位于745～747nm,摩尔吸光系数为ε_(745)=1.25×10~5～1.64×10~51·mol~(-1)·cm~(-1),比对硝基偶氮氯膦光度法灵敏度高,稳定性好。钇组稀土在5～15μg·25ml~(-1)范围内符合比耳定律。用PMBP-苯萃取分离非稀土干扰元素,钛铁试剂萃洗铈组稀土,可有效地抑制“共显色”。应用于岩石矿物中钇组稀土元素的测定,获得了满意的结果。
The synthesis of chloro-chlorophosphonazo (CPA-P-Cl) and its photoluminescence properties with yttrium have been reported. Based on this, the chromogenic conditions of rare earth elements in CPA-P-Cl and yttrium groups were studied. In the acetic acid-sodium acetate medium, the stable β-type complex formed by CPA-P-Cl and yttrium group rare earths, the maximum absorption peak at 745-747nm, the molar extinction coefficient ε745 = 1.25 × 10-5 ~ 1.64 × 10 ~ 51 · mol ~ (-1) · cm ~ (-1), which is more sensitive and stable than the nitro-chlorophosphonazo photometry. The yttrium group rare earth complies with Beer’s law in the range of 5 ~ 15μg · 25ml ~ (-1). With PMBP-benzene extraction separation of non-rare earth interference elements, titanium-iron reagent extraction rare earth cerium group, which can effectively inhibit the “total color.” It is applied to the determination of rare earth elements in the yttrium group in rock minerals and obtained satisfactory results.