INVESTIGATION OF THE ANALYTICAL PERFORMANCE OF AN ERIOCHROME BLACK T-IMMOBILIZED SORBENT FOR THE SORPTION-SPECTROPHOTOMETRIC DETERMINATION OF Sn(II) IONS

The development of sensitive and selective methods for the determination of trace metal ions remains an important task in analytical chemistry and environmental monitoring. In this study, the analytical performance of an Eriochrome Black T (EBT)-immobilized sorbent was investigated for the sorption-spectrophotometric determination of Sn(II) ions in aqueous media. The sorbent was prepared by immobilizing EBT onto a silica gel matrix, providing a stable and selective surface for the preconcentration and detection of Sn(II). The influence of experimental parameters, including solution pH, contact time, sorbent dosage, and initial Sn(II) concentration, was systematically evaluated to establish optimal analytical conditions. The interaction between Sn(II) ions and the immobilized reagent resulted in the formation of a colored surface complex, enabling sensitive spectrophotometric measurements. The immobilized sorbent exhibited high affinity toward Sn(II) ions, good adsorption capacity, and satisfactory selectivity in the presence of common interfering ions. Under optimized conditions, a linear relationship between absorbance and Sn(II) concentration was obtained within the investigated concentration range. The proposed method demonstrated good precision, accuracy, and reproducibility, making it suitable for the determination of trace amounts of Sn(II) in environmental water samples. The results indicate that the EBT-immobilized sorbent is a promising analytical material for the rapid, cost-effective, and environmentally friendly determination of Sn(II) ions.