在钯 (Ⅱ )与对碘偶氮氯膦配合物中加入吐温 6 0 ,形成三元显色体系 ,后者的灵敏度有显著的提高 ,其表观摩尔吸光系数ε63 8=6 0× 10 4L·mol-1·cm-1,钯含量在 0 1～ 1 2mg·L-1范围内符合比耳定律 ;同时方法的选择性亦有所改善 ,可在水相中直接测定微量钯 ,常见阳离子对此反应均无干扰 ,其他贵金属离子也有数倍的允许值 ,在钯催化剂回收液和二次阳极泥的微量钯的测定中 ,获得满意的结果 Tween 60 was added to palladium (II) complex with p-iodochlorophosphonazo to form a ternary chromogenic system. The sensitivity of the latter was significantly improved. The apparent molar absorptivity ε63 8 = 60 × 10 6 4L · mol-1 · cm-1. The palladium content is in the range of 0 1 ~ 1 2mg · L-1. Beer’s law is also obeyed. The selectivity of the method is also improved. Cations did not interfere with this reaction, other precious metal ions also have several times the allowable value in the palladium catalyst recovery solution and secondary anode mud trace palladium determination, to obtain satisfactory results