A Simple Spectrophotometric Method for the Determination of Copper in Some Real, Environmental, Biological, Food and Soil Samples Using Salicylaldehyde Benzoyl Hydrazone (M. Jamaluddin Ahmed & Tasnima Zannat, Trans.). (2025). Pakistan Journal of Analytical & Environmental Chemistry, 13(1), 22-35. https://doi.org/10.21743/