Copper Traces Quantification in Bee’s Products by Solid Surface Fluorescence. A Green Analytical Proposal

TALÍO, MARÍA CAROLINA; ACOSTA, MARIANO; FERNÁNDEZ, LILIANA PATRICIA

Journal of Fluorescence

Springer

Año: 2024 vol. 33 p. 1803 - 1812

An accurate, economic and green methodology for Pb(II) monitoring in bee products is proposed. Complexed metal traces were preconcentrated on Nylon membranes using the coacervation phenomenon based on room temperature reaction between the cationic surfactant hexadecyltrimethylammonium bromide and the bile salt sodium cholate. The increase in solid surface fluorescence signal of dyes 8-hydroxyquinoleine and o-phenanthroline due to Pb(II) presence was used for the metal quantification. Experimental variables that influence on preconcentration step and fluorimetric sensitivity were optimized using uni-varied assays. Pb(II) concentration was determined on membranes by solid surface fluorescence at λem = 470 nm (λexc = 445 nm), using a solid sample holder. The calibration at optimal experimental conditions showed a LOD of 4.2 × 10– 4 mg Kg− 1 with a linear range of 1.28 × 10– 3 mg Kg− 1 to 8.73 mg Kg−1 and was successfully applied to Pb(II) quantification in different bee products produced in central west region of Argentina. The proposed methodology was applied to all samples after appropriate dilution. Accuracy methodology was evaluated by comparison of the obtained results with those found by ICP-MS, with percentage relative error under 8%. The precision was better than 0.0344 CV for Pb(II) determination.