Dichloroacetic acid and trichloroacetic acid are common organic chloride pollutants in water, which have potential hazards to the environment and human health. Dichloroacetic acid and trichloroacetic acid are usually caused by factors such as industrial wastewater, agricultural emissions, and disinfection by-products.  In order to effectively monitor and control the content of dichloroacetic acid and trichloroacetic acid in water, it is necessary to establish accurate and reliable measurement methods.Ion chromatography can conveniently and quickly determine disinfection by-products.