Abstract:

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 multi-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.

Key words: BCO photometric method, cyanide-ammonia system, copper ammonia complex ion