Determination of the trace of aluminium (III) in natural fresh water by cathodic redissolution following the adsorption of an aluminium-lumogallion complex [Determination de traces d'aluminium (III) dans les eaux douces naturelles par redissolution cathodique apres adsorption d'un complexe aluminium-lumogallion]
Abstract
This paper describes an electrochemical procedure for the determination of aluminium traces in which pre-concentration is achieved by the adsorption of an aluminium-lumogallion complex onto a hanging mercury drop electrode. The effects of various operational parameters (pH, ligand concentration, potential and accumulation time) on the reduction current of the adsorbed chelate are discussed. Possible interferences by trace metals and organic matter are investigated. A linear current concentration relationship was observed up to 1.5 10-7 mol.L-1. The detection limit is 1.5 10-9 mol.L-1.