Use of nitrogen-containing polymers for stabilizing iodine-containing compounds, is claimed. Independent claims are also included for: (1) stabilizing iodine-containing compounds, comprising contacting the polymers containing iodine-containing compounds with nitrogen； (2) producing nitrogen-containing polymers, comprising reacting aziridines in the presence of water and optionally cosolvents； (3) biocidal agents comprising iodine-containing compounds, and nitrogen-containing polymer； and (4) a binding agent formulation, comprising binding agent, iodine-containing compounds, and nitrogen-containing polymer.
