Akademik Veri Yönetim Sistemi
Water Air Soil Pollut, cilt.236, sa.5, ss.477, 2025 (Hakemli Dergi)
In this study, a cost-efective and environmentally friendly solid-phase extraction (SPE) method using walnut shell-immobilised on Amberlite XAD-4 (WNS-XAD-4) was developed to preconcentrate and determine Cu(II) and Cd(II) ions in water samples prior to fame atomic absorption analysis (FAAS). The low-cost adsorbent, prepared by immobilizing waste walnut shells on Amberlite XAD-4 (WNS-XAD-4), was characterized using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Thermal Gravimetric Analysis (TGA), and Brunauer–Emmett– Teller (BET) analysis. Under optimal conditions, the method achieved recoveries of 95.7% for Cu(II) and 100% for Cd(II) using 5.0 mL of 1.5 mol L−1 HNO3 as eluent. The detection limits were found as 0.582 μg L−1 for Cu(II) and 0.03 μg L−1 for Cd(II) with preconcentration factors of 10 and 40, respectively. The accuracy of the method was validated using the certifed aquatic plant reference material BCR-670 and successfully applied to various real water samples, including those from Lake Van, Billoris Spa, tap water, salt water and wastewater from Siirt, Turkey.