ETA-AAS DETERMINATION OF TRACES OF ALUMINUM IN WATER AFTER COLLECTION AS A COMPLEX WITH CHROMAZUROL B ON A PTFE MEMBRANE FILTER

摘要

A simple and rapid preconcentration technique is proposed for the ETA-AAS determination of traces of aluminum in water. Aluminum at μg/l levels in 100ml of water sample is converted into an anionic complex with Chromazurol B. The anion is collected on a polytetrafluoroethylene (PTFE) membrane filter as an ion-associate with benzyldimethyltetradecylammonium ion (Zeph+) by filtration under suction. The ion-associate on the membrane is eluted in 5ml of a mixture of ethanol and N, N-dimethylformamide. The aluminum in the concentrate is determined by ETA-AAS. Once the complex is formed, it takes only 5minutes for the collection and elution of the ion-associate. This technique was applied to the analyses of tap waters.