Determination of aluminium using different techniques based on the Al(III)-morin complex

Area of Science:

• Analytical Chemistry
• Environmental Chemistry

Background:

• Accurate determination of aluminum (Al(III)) in aqueous samples is crucial for environmental monitoring.
• Existing methods like UV-Vis spectrophotometry and spectrofluorimetry have limitations in detection sensitivity for Al(III).

Purpose of the Study:

• To compare the analytical performance of UV-Vis spectrophotometry, spectrofluorimetry, and differential pulse adsorptive stripping voltammetry (DPAdSV) for Al(III) determination.
• To identify the most sensitive and reliable method for quantifying Al(III) in water samples.

Main Methods:

• Complexation of Al(III) with morin.
• Optimization of experimental conditions for each analytical technique.
• Comparative analysis of detection limits and performance.

Main Results:

• DPAdSV exhibited the lowest limit of detection (70 nM) for Al(III), outperforming UV-Vis spectrophotometry (300 nM) and spectrofluorimetry (110 nM).
• Optimized DPAdSV conditions (pH 4.4, deposition potential +243 mV, deposition time 210 s) were established.
• The DPAdSV method provided satisfactory results for Al(III) analysis in river, tap, and bottled water.

Conclusions:

• DPAdSV is a highly sensitive and effective technique for the determination of Al(III) in aqueous environmental samples.
• The optimized DPAdSV method offers a significant improvement in detection capability over traditional spectrophotometric and spectrofluorimetric approaches.