AOX is a significant parameter which has seen heavy focus in the last decade for industrial effluents. Organohalogen compounds are generally resistant to rapid microbiological breakdown in the environment and exhibit moderate to pronounced toxicities to various species. They consequently represent an increasing environmental hazard as they are widely disseminated through both natural aquatic systems and the atmosphere. Limits for AOX industrial discharge have been set in a number of countries worldwide although there are no presently known UK limits. The recognised test methods employed for AOX are in accordance with the relevant USEPA, BSEN, DIN standards. MSS are able to offer AOX analysis using the latest Coulometric analyser. MSS are UKAS accredited for the analysis.