Affiliations: [a] Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt
| [b] Food Technology Research Institute, Giza, Egypt
| [c] Faculty of Public Health and Health Informatics, Umm AL-Qura University, Makkah, Saudi Arabia
Correspondence:
[*]
Corresponding author: Ayman Gouda, Department of Chemistry, Faculty of Science, Zagazig University, Zagazig,
Egypt. Tel.: +00966542087968; Fax: +0020552308213; E-mail: aaghoneim@uqu.edu.sa.
Abstract: A new, green, and simple cloud point extraction process of aluminum (III) from aqueous solution was investigated. The method is based on the complexation reaction of aluminum (III) with alizarin red S (ARS) at pH 5.0 and micelle-mediated extraction of the complex with nonionic surfactant Triton X-114. The enriched analyte in the surfactant-rich phase was determined spectrophotometrically at 515 nm. The optimal conditions including pH, reagent volume, surfactant concentration, temperature and centrifugation time were optimized. The proposed CPE method showed linear calibration within the range 5.0–300 ng mL–1 of aluminum (III) and the limit of detection was 1.0 ng mL–1 with a preconcentration factor of ∼100. The relative standard deviation (RSD%) and relative error (RE%) were found to be 1.70% and 1.78%, respectively. The accuracy of method was evaluated by the analysis of certified reference materials. The interference effect of some cations and anions was also studied. In the presence of foreign ions, no significant interference was observed. The method was applied to the determination of aluminum (III) in real food samples with a recovery for the spiked samples in the range of 95.0–102%.
Keywords: Cloud point extraction, aluminium(iii), spectrophotometry, alizarin red s, certified reference materials, food samples
