Akademik Veri Yönetim Sistemi
Turkish Journal of Chemistry, cilt.50, sa.1, ss.86-101, 2026 (SCI-Expanded, Scopus, TRDizin)
Determination of trace cobalt(II) (Co(II)) in real samples remains challenging because of its very low concentration and strong matrix interferences. In this study, a simple and green magnetic solid-phase extraction (mSPE) method was developed for the selective separation and preconcentration of Co(II) ions using a newly designed iron oxide/hexagonal boron nitride (IOhBN) nanocomposite. The material was synthesized through a one-step, surfactant-free coprecipitation process, combining the high surface area, stability, and layered structure of hBN with the magnetic and reactive features of Fe₃O₄ nanoparticles. This hybrid structure provided abundant active sites and rapid magnetic separability, enabling efficient extraction within 5 min using only 15 mg of sorbent. The optimized conditions were pH 7.0, eluent type and volume (3.0 mol L-¹ of HNO₃, 0.5 mL), and total extraction time of 5 min. The method exhibited reliable and environmentally efficient analytical performance with a limit of detection of 0.67 µg L-¹, a relative standard deviation of 4.2%, and an enrichment factor of 20. Validation with certified reference materials (water, BCR 505; onion NCS ZC 73033; spinach leaves, NIST1570a) and successful applications to water and food samples confirmed its reliability. The results demonstrate that the proposed IOhBN-based mSPE method is a novel, rapid, and environmentally sustainable approach for ultra-trace Co determination in complex matrices.