Spinel CuMn2O4 nanoflakes as an effective adsorbent for dispersive solid phase micro-extraction of silver and lead in spices and water

Abstract

In the current work, we synthesized spinel CuMn2O4 nanoflakes using coprecipitation and pyrolysis methods. The resultant adsorbent was used as a fast and selective adsorbent for D-SPµE of silver and lead ions in river water, tap water, lake water, well water, wastewater, red pepper, black pepper, cinnamon, and cumin. This is the first study on D-SPµE of silver and lead ions with nanoflakes morphology among spinel oxides. Experimental factors affecting the extraction of the silver and lead ions by CuMn2O4 nanoflakes were examined. The optimal pH was found to be 2.0. Adsorption/elution contact times and eluent were no vortexing adsorption/30 s elution, and 2 mL of 2 mol L-1 HCl, respectively. The adsorption capacity of the CuMn2O4 nanoflakes was 42.4 mg g-1 for silver and 42.7 mg g-1 for lead. The RSD% of the analytes was ≤3.1%. The selectivity of Pb(II) was very high. The results were verified by BCR-482 Lichen, SPS-WW1 Batch 121 Wastewater, and NW-TMDA-54.6 Lake water analyses. The recovery tests in the spices and water samples were done. The recovery ranges were found to be 90-102% and 93-102% for silver and 88-98% and 89-97% for lead in water and food, respectively. It indicates an accurate, reliable, fast, and selective approach for FAAS determination of silver and lead in the samples.