Used as a reference solution in analytical chemistry for calibration of instruments, particularly in surfactant concentration measurements. Commonly applied in UV-Vis spectrophotometry and titration methods to determine the critical micelle concentration (CMC) of cationic surfactants. Also utilized in nanoparticle synthesis as a stabilizing agent, where precise concentration control is essential for reproducible particle size and morphology. Suitable for quality control in pharmaceutical, cosmetic, and detergent industries where cetyltrimethylammonium bromide content must be accurately monitored.