GB/T 15959-1995 is a water quality testing standard, and micro-Coulometry is used to determine adsorption organic halogens (AOX). AOX reflects the level of halogenated organic pollutants in water, which threatens ecology and human health. The standard details the process of collecting and pretreating water samples, activating carbon adsorption organic halogens, releasing hydrogen halides from high temperature combustion, and then detecting electrical signals with a micro-coulometry to determine the content of AOX. There are clear specifications for equipment, reagent preparation, operation steps, and result calculation. Sensitivity of this method is high, and it is suitable for a variety of water samples. It provides key technical support for water quality monitoring and pollution control, and helps to ensure water environment safety.