BCO光度法测定氨氰体系溶液中铜氨络离子态铜量

Determination of Copper in Copper Ammonia Complex of Cyanide-Ammonia System by BCO Photometric Method

本次工作建立了氨氰体系溶液中铜氨络离子态铜量的BCO测定方法，解决了多价态铜离子络合物体系溶液中铜氨离子的选择性测定问题。在pH值为9．0的氨水～氯化铵缓冲溶液中，用柠檬酸铵溶液掩蔽其他的金属离子，采用分光光度法测定氨氰体系溶液中铜氨络离子态铜（Ⅱ）的含量。铜氨络离子态铜（Ⅱ）与BCO形成蓝色络合物，其最大吸收波长位于600nm，线性相关系数达0．9999．检出限为0．010mg／L。对氨氰体系溶液进行加标回收，加标回收率为97％-102％，相对标准偏差（n=6）在0．09％-0．46％之间。该方法不经过复杂的处理步骤，操作便捷、测定迅速且准确可靠。

BCO determination method of copper ammonia complex ion in ammonia cyanide solution was established to solve the problem of determine copper ammonia complex ion content in muhi-valence copper ion complex solution.Ammonium citrate solution was used to mask other metal ions in the ammonia-ammonium chloride buffer solution （pH=9.0） and the Cu （ Ⅱ ） content was determined by BCO photometric method in the ammonia solution cyanide system as copper ammonia complex ion.Cu（ Ⅱ ） in copper ammonia complex ion reacted with BCO to form blue complex,which has a maximum absorption wavelength of 600 nm,with a linear correlation coefficient of 0.9999 and a detection limit of 0.010 mg/L.The recovery rate of adding standard was 97% to 102%, and the relative standard deviation （n=6）was 0.09% to 0.46%.The method does not require complex processing steps and has the advantages of simple, rapid, accurate, reliable and easy operation.