Metal and organic release from construction products in contact with drinking water disinfected with Sodium Hypochlorite

摘要

According to the Council Directive 98/83/EC on the quality of water intended for human consumption, Member States shall ensure that no substances or materials used in the preparation or distribution of water remain in water in concentrations higher than is necessary for the purpose of their use and do not reduce the protection of human health. To this end, the Directive sets parametric values for a number of metals and organics that can be released into water by construction products in contact with drinking water (CPDW) and can pose a threat to human health. It is well known that migration from CPDW into water can be affected by many factors such as surface properties of materials, design of distribution system, flow regime as well as chemical and physical characteristics of water. In particular, disinfectant residues may promote a significant release of chemical species by altering redox equilibriums or reacting with material surface.