A simple Flow Injection - Spectrophotometric Determination of Copper (II) using 4 - ( 6 - bromo - 2 - benzothiazolylazo) Pyrogallol as chromogenic agent

A simple and facial flow injection method coupled with spectrophotometer dete ction was d eveloped to determination of copper(II) . The FIA sys tem based on the reaction of Copper (II) with 4 - (6 - bromo - 2 - benzothiazolylazo) p yrogallol (4 - Br - BTAP) at pH 5.8 with an absorption maximum at 570 nm. The optimum FIA variables were investigated. The proposed method has a linear calibration range 0.01 - 7 . 0 μg.mL - 1 of copper(II) with the regression whereas t he observe d detection limit was 0.008 μg.mL - 1 and t he percentage of recovery of 103.64 %. The proposed method was shown good precision with rel ative standard deviations was 0.96 %. The sampling frequency was 12 0 determinations per hour. The method has been appl ied to the determination of copper i n filling and metallic wire.