Hydrophilic film for detection of heavy metals
AssigneeEastman Kodak Company
InventorJohn E. Kiefer
Life of this patent
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Abstract
A transparent hydrophilic film for detecting the presence of heavy metals in aqueous solutions; the method of making same and the film as made by the method; and the use of a transparent hydrophilic film having therein a dispersion of finely precipitated zinc sulfide which becomes discolored by ion exchange when indicating the presence of heavy metals, the degree of discoloration being also a measurement of the concentration of such heavy metals.
Claims23
The method of making a transparent hydrophilic film for detecting heavy metals, comprising dissolving zinc chloride and a cellulose ester in a volatile solvent to form a liquid solution, casting said liquid solution to form a film, and then treating the film with a sulfide donor to convert said zinc chloride to a transparent dispersion of finely precipitated zinc sulfide.
A hydrophilic film for detecting heavy metals, comprising a film having a dispersion therein of finely precipitated zinc sulfide, the resulting film being transparent.
In a method of detecting heavy metals in an aqueous solution wherein said aqueous solution contacts a film for indicating the presence of said heavy metals, the improvement comprising using a film having a dispersion of finely precipitated zinc sulfide therein, said film being transparent and becoming discolored when indicating the presence of heavy metals, the extent of such discoloration also indicating the measurement of concentration of such heavy metals.
Dependencies are inferred from the claim text.