Novel Polymeric Resin for Solid Phase Ex

Interest in preconcentration techniques for the determination of metals at ultratrace levels continues to increase due to the limitations of flameless atomic absorption spectrometry and the high costs associated with other sensitive methods compared to flame atomic absorption spectrometry (FAAS). This study aimed to synthesize, characterize, and apply a thiol-containing sulfonamide resin as a new sorption material for solid phase extraction and determination of lead in natural water samples. Experimental conditions were optimized by varying pH, contact time, and the volumes of initial and elution solutions. Following the preconcentration procedure, FAAS was utilized for the quantification of lead. The synthesized resin demonstrated enhanced performance compared to existing adsorption reagents, eliminating the need for complexing agents and exhibiting high sorption capacity. The analytical scheme achieved a 280-fold increase in sensitivity by integrating the slotted tube atom trap-atomic absorption spectrometry (STAT-FAAS) with the developed preconcentration method. The limit of detection was determined to be 0.15 ng mL⁻¹, with Pb²⁺ concentrations detected in the water samples ranging from 0.9 to 6.7 ng mL⁻¹.