Fluorimetric determination of aluminium in water by sequential injection through column extraction

Abstract

A fluorimetric procedure for the determination of aluminium with matrix removal in drinking water is proposed. The system is based both on the solid phase extraction of aluminium on a new chelating resin (XAD-4 modified by grafting salicylic acid) and the fluorimetric detection of a complex formed between 8-hydroxyquinoline-5-sulfonic acid (HQS) and Al(III), after elution of the resin by hydrochloric acid. The sorption and elution of aluminium were studied in both competitive and noncompetitive conditions, varying pH, flow-rates, volume and concentration of reagents, as well as time contact. The optimised procedure allows determination of Al 3+ at the sub-ppb level (LOD: 0.2 µg L -1 for 1 ml of sample) within a working range of 0.2-500 µg L -1 . The analytical procedure was successfully employed for the determination of aluminium in drinking water during and after flocculation/coagulation treatment processes.

EFFECT OF NON-IONIC SURFACTANTS TO THE Al(III)-MORIN COMPLEX AND ITS APPLICATION IN DETERMINATION OF Al(III) IONS: A PRELIMINARY STUDY

“…Sensitive analytical procedures are therefore required to study and monitor its level in the environment and its toxicology. While several methods have been developed for the determination of Al(III), spectrophotometry [4][5][6] and spectrofluorimetry [7][8][9][10] are the preferred techniques due to their simplicity, high precision and accuracy, high sensitivity, low cost and widespread availability of equipment.…”

Uses of 5-Methylresorcin-bonded polyurethan foam as a new solid phase extractor for the selective separation of mercury ions from natural water samples

“…The incorporation processes reduce problems resulting from leaching of the ligand from the support in case of loaded foam. Ligands can be coupled on a polymeric sorbent such as open cell polyurethane foam (PUF) [30][31][32] through several groups, such as azo [33][34][35][36][37][38][39][40]. Immobilization via an azo linkage is one of the most commonly employed methods.…”

An experimental design to optimize the flow extraction parameters for the selective removal of Fe(III) and Al(III) in aqueous samples using salicylic acid grafted on Amberlite XAD-4 and final determination by GF-AAS

“…Whatever aim these sorbents are used, most of papers consider optimization strategies based in a single variable approach (SVA) [28][29][30][31]. This step by step approach can lead to erroneous conclusions about the importance of certain factors on the removal process, and, above all, can lead to carry out numerous experiments to find optimized extraction parameters.…”