【摘要】 本文研究了Ｐｂ（Ⅱ）－５－Ｂｒ－ＰＡＤＡＰ及Ｚｎ（Ⅱ）－５－Ｂｒ－ＰＡＤＡＰ络合反应体系的吸收光谱，用基于Ｒｏｓｅｎｂｒｏｃｋ算法的最优化程序处理了光度测量数据，发现Ｐｂ（Ⅱ）与５－Ｂｒ－ＰＡＤＡＰ形成１：１络合物，稳定常数ｌｇβ＿１＝１１．２１，摩尔吸光系数ε＿１＝６．２×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）；Ｚｎ（Ⅱ）在ｃ＿Ｌ＞ｃ＿Ｍ的条件下主要形成１：２络合物，ｌｇβ＿２＝２２．３６，ε＿２＝１．２８×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。更多还原

【Abstract】 The absorption spectra of Pb（Ⅱ ）-5-Br-PADAP and Zn（Ⅱ）-5-Br-PADAP complexing systems are studied,and their spectrophotometric data are pro-cessed by using an optimization program based on Rosenbrock’s method. It is deter-mined that Pb（Ⅱ）ion forms 1 :1 complex with 5-Br-PADAP,the stability constant lgβ₁ of the complex is 11.21,the molar absorptivity is 6.2×10￣4L·mol￣（-1）·cm￣（-1）;Zn（Ⅱ）ion reacts with 5-Br-PADAP and forms 1 :2 complex under the condition of c_L >c_M,the stability constant lgβ₂ is 22.36,the molar absorptivity is 1. 28 × 10￣5L·mol￣（-1）·cm￣（-1）。更多还原