Carbon 1 Copper 1 Copper determination 1 Cu determinations 1 Cyclic voltammetric Cyclic voltammetry 1 Electrodes 1 Electromagnetic coupling 1 Forensic analyst 1 Gold coatings 1 Inductive coupled plasma 1 Inductively coupled plasma 1 Light emission 1 Limit of detection 1 Optical emission spectroscopy 1 Plasma diagnostics 1 Plasma torches 1 Relative standard deviations 1 Screen-printed carbon electrodes 1