Colorimetric Detection of Pb<sup>2+</sup> Using Green Synthesized AgNPs

Lead (Pb 2+ ) contamination poses a serious health risk. In this study, silver nanoparticles (AgNPs) were synthesized using bignay leaf extract (BLE) for the colorimetric detection of Pb 2+ in water. UV-vis spectroscopy confirmed the formation of AgNPs with a surface plasmon resonance peak at 415-417 nm. EDX analysis revealed that the AgNPs had an elemental composition of 66.53% Ag, 13.47% O, and 11.54% C. DLS analysis showed an average hydrodynamic size of 140.2 nm. The reaction between AgNPs and Pb 2+ resulted in the decolorization of the solution, which was attributed to the formation of Pb-GA complexes. The limit of detection (LOD) and limit of quantification (LOQ) were 50 ppb and 500 ppb, respectively.