Flotation-Spectrophotometric Method for the Determination of Aluminium ion Using Xylenol Orange

Abstract

A simple, fast, reproducible and sensitive method for the flotation- spectrophotometric determination of Al³⁺ is reported. The apparent molar absorptivity (ε) of the ion associate was determined to be 8.35×10⁴ L mol^-1 cm^-1. The calibration curve was linear in the concentration range of 1.0-50 ng mL^-1 of Al³⁺ with a correlation coefficient of 0.9997. The limit of detection (LOD) was 0.621 ng mL. The relative standard deviation (RSD) at 10 and 30 ng mL^-1 of aluminium were 1.580 and 2.410% (n=7) respectively. The method was applied for measuring the amount of aluminium in water samples.