Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) is an analytical technique used to detect and quantify elements in a sample. It works by introducing a liquid sample into a high-temperature plasma, which ionizes the sample and excites its atoms. As these excited atoms return to their ground state, they emit light at characteristic wavelengths, allowing for the identification and measurement of various elements. This method is widely used in fields such as environmental monitoring, geochemistry, and materials science due to its ability to analyze multiple elements simultaneously with high sensitivity and precision. ICP-OES is particularly effective for detecting trace elements in complex matrices.