SPECTROPHOTOMETRIC DETERMINATION OF ALUMINUM AND COPPER IONS USING SPADNS

Aluminum and copper ions are selectively estimated spectrophotometrica lly. These ions form colored complexes with spadns which have a maximu m absorbance at 580 nm. The complexes formed with both cations are sta ble and pH dependant; aluminum is favorably complexed at pH 5, while c opper is complexed at pH 7. The percentage recoveries were found to be 99.69 +/- 0.75 and 99.32 +/- 0.6 with a minimum detection limit of 0. 08 and 0.23 mu g ml(-1) for aluminum and copper ions respectively. The re is insignificant interference from the 10-fold concentrations of ot her metal ions under the proposed reaction conditions.