Department of Chemistry, Okayama University of Science
Abstract
Salicylidene-o-aminophenol (SAPH), one of the typical Schiff base, has been studied as a spectrofluorimetric reagent for aluminium and also as a spectro-photometric reagent for copper, cadmium and zinc. As be expected from the structure, SAPH and its metal complexes are insoluble in water, then analytical difficulties result from the formation of the precipitates. Therefore, the methods such as precipitation followed by acid dissolution, solvent extraction or solubilization with quaternary ammonium salt are necessary for the determination. Salicylidene-o-aminophenol-4-sulfonic acid (SAPS), a SAPH derivative which introduced a sulfonic acid group into a phenyl ring, becomes soluble in water. It is available a simple and rapid determination of certain metals without any treatment. Morishige had reported the high sensitivity of SAPS on the fluorescence properties compared with 87 Schiff bases. Fluorimetry is more sensitive than spectrophotometry, but requires a instrumental necessity and skillfulness. The authors proposed the use of SAPS for the spectrophotometry in water solution, and determined copper and vanadium easily. This paper presents that SAPS as a spectrophotometric determination for aluminium and application to the determination of aluminium in steels
