DISPERSIVE SOLID-PHASE MICROEXTRACTION FOR AZO DYE — Proceeding R-3

Apstrakt

A dispersive solid-phase microextraction (DSPME) method based on amino-functionalized glycidyl methacrylate polymer was developed and optimized for preconcentration of the azo dye Congo Red (CR) from aqueous samples. Key factors affecting extraction efficiency, including sorbent amount, pH, extraction time, ionic strength, and eluent type, were studied. The method demonstrated good linearity, low limits of detection, and high enrichment factors. The DSPME method was successfully applied to tap water and industrial wastewater samples, showing its potential for environmental monitoring of azo dyes.

Keywords: dispersive solid-phase microextraction, amino-functionalized polymer, Congo Red, azo dye, water analysis

Introduction

Azo dyes are widely used in textile, paper, and food industries, and their presence in wastewater is a significant environmental concern. Preconcentration techniques are essential for the trace determination of these dyes in environmental samples. DSPME is an effective and environmentally friendly technique, combining the advantages of solid-phase microextraction with rapid and simple sample preparation.

Materials and Methods

Amino-functionalized glycidyl methacrylate polymer was used as sorbent. Variables such as sorbent amount, sample pH, extraction time, and eluent type were systematically optimized. The concentrations of CR were measured using UV-Vis spectrophotometry. The method performance was validated with respect to linearity, limit of detection, precision, and enrichment factor.

Results and Discussion

Optimization showed that the extraction efficiency was highest at pH 7 with 50 mg of sorbent for 10 min. Enrichment factors ranged from 45 to 60, and limits of detection were in the low μg/L range. Real sample analysis confirmed the applicability of the method to tap water and industrial wastewater.

References

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  2. Marković B, Tadić T, Bulatović S, Nedić N. Dispersive solid-phase microextraction of azo dyes: Optimization and application. Journal of Environmental Chemistry. 2025, 42, 1012–1020.
  3. Other references as cited in the original PDF.