镝－ＢＰＭＰＨＤ—ＣＴＭＡＢ离子缔合物体系具有较强的荧光强度．在该体系中，Ｇｄ３＋、Ｙ３＋、Ｌｕ３＋和Ｌａ３＋等稀土离子均能使镝的荧光增强，这是新发现的一种共发光体系．本文详细研究了镝－钆－ＢＰＭＰＨＤ－ＣＴＭＡＢ体系共发光效应的形成条件和影响因素．实验表明，在最佳测试条件下，镝在１．０×１０－７～６．０×１０－６ｍｏｌ／Ｌ范围内与其荧光强度呈线性关系，检出限为２．０×１０－８ｍｏｌ／Ｌ，它比无Ｇｄ３＋存在时体系的检出限降低了一个数量级．应用该体系测定稀土氧化物及稀土合成样品中痕量镝，结果较为满意． Dysprosium-BPMPHD-CTMAB ion association system has a strong fluorescence intensity. In this system, rare earth ions such as Gd3 +, Y3 +, Lu3 + and La3 + can enhance the fluorescence of dysprosium, which is a newly discovered co-luminescent system. In this paper, the formation conditions and influencing factors of co-luminescence effect of dysprosium-gadolinium-BPMPHD-CTMAB system were studied in detail. The experimental results show that under the optimum conditions, the fluorescence intensity of dysprosium has a linear relationship in the range of 1.0 × 10-7 ~ 6.0 × 10-6mol / L with the detection limit of 2.0 × 10-8mol / L, which is an order of magnitude lower than the detection limit of the system in the absence of Gd3 +. The system was applied to the determination of trace amounts of dysprosium in rare earth oxides and rare earth samples. The results were satisfactory.