水杨基萤光酮-溴化十二烷基二甲基苄铵高灵敏分光光度法测定微量铜

HIGH SESITIVE SPECTROPHOTOMETRIC DETERMINATION OF TRACE COPPER WITH SALICYL FLUORONE-DDMBA

在NH4Cl－NH·H2O介质中，铜与水杨基萤光酮、溴化十二烷基甲基苄铵形成紫红色三元配合物，最大吸收波长580nm，表现摩尔吸光系数ε580为1．13×105L·mol-1．该法灵敏度高，操作简便，重现性、选择性好，并应用于铁矿石中微量铜的测定，结果尚佳。

In NH4Cl-NH3. H2O buffer medium copper with salicyl fluorone-DDM-BA form purplish red complex. The composition of complex is Cu(Ⅱ ): SAF=1: 2.The maximum absorption wavelength of the complex is 580 nm and the apparent molar ab-sorptivity at 580 nm is 1.13×105 L. mol- 1. cm-1. Beer's law is obeyed for copper in therang of 0~2. 5 ug/25 ml. The method has been applied to the determination of copper ironore with satisfactory results.