13 Classification of Main Instrumental Methods 1. Optical Methods Atomic Absorption Spectroscopy, Emission, Spectroscopy Fluorescence Spectroscopy Molecular: UV-Vis Spectrophotometry IR Spectroscopy 2. Electrochemical Methods Potentiometry Polarograph Voltammetry 3. Chromatography Gas Chromatography Liquid Chromatography1.3. Classification of Main Instrumental Methods 1. Optical Methods Atomic: Absorption Spectroscopy, Emission, Spectroscopy Fluorescence Spectroscopy Molecular: UV-Vis. Spectrophotometry IR Spectroscopy 2. Electrochemical Methods Potentiometry Polarography Voltammetry 3. Chromatography Gas Chromatography Liquid Chromatography