Nitrogen monoxide absorbing compositions.

摘要

The invention provides improved filters for absorbing nitrogen monoxide from tobacco smoke, wherein a base of acetate, cellulose and/or acetate-cellulose fibres is impregnated with an absorbing agent comprising a complex of ferrous iron and a thiol-containing low-molecular ligand, either as an aqueous suspension or solution of the complex, and then drying, or treating the base with an aqueous solution of thiol, drying, treating with an aqueous solution of ferrous ion and again drying; and a method of removing nitrogen monoxide from smoke by passing the smoke through the absorbing agent or the filter.