This USP test for Organic Impurities in Ethanol is a quantitative analysis performed using Gas Chromatography (GC) to detect and measure trace organic impurities in ethanol. These impurities may arise from the manufacturing process or raw materials and can affect the safety and quality of ethanol used in pharmaceutical applications. This test method quantifies acetaldehyde and acetal, benzene, methanol, and all other organic impurities (group), as well as total organic impurities.