Vortex-assisted ionic liquid-based dispersive liquid-liquid micro-extraction and spectrofluorometric determination of Rhodamine B in anti-freeze, lipstick, liquid soap, matches and red pencil core

Abstract

A simple, centrifugeless vortex-assisted ionic liquid-based dispersive liquid-liquid micro-extraction method was developed for spectrofluorometric determination of Rhodamine B dye. Analytical extraction parameters including pH, type and amount of ionic liquid, salt concentration, vortex rate and time were examined and optimized. Matrix effects of potentially interfering ions and dyes were investigated and their tolerable concentrations were determined by applying optimum conditions. Detection limit and preconcentration factor were determined 0.01 μg L-1 and 30, respectively. Dynamic range of the method was linear at RhB concentration range between 0.025 and 1000 μg L-1. Relative standard deviations were 3.9% for the ten replicates measurements of 0.125 μg L-1 Rhodamine B. The method was successfully applied to different samples including anti-freezes, liquid soap, matches, red pencil core and lipsticks. RhB concentrations of liquid and solid samples were determined between 2.05 μg mL-1 and 10.05 μg mL-1 and 307 μg g-1 and 2.75 mg g-1, respectively.

Keywords

• Dispersive liquid-liquid micro-extraction
• ionic liquid
• rhodamine B
• spectrofluorometry

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