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US 4,379,848 AGranted
Method of analyzing an aqueous liquid for hexacyanoferrates
AssigneeEastman Kodak Company
InventorDavid C. Yeaw
Life of this patent
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Abstract
Colorimetric analysis for the presence or concentration of hexacyanoferrates in an aqueous liquid is carried out by forming a colored indicator compound which is soluble therein. The analysis is based on the use of a cobaltic complex of tris-1,10-phenanthroline or tris-2,2'-bipyridyl as an analytical reagent.
Claims16
A method for detecting hexacyanoferrates in an aqueous liquid, the method comprising the steps of:
- (a) forming an alkaline reaction system comprising the aqueous liquid and a cobaltic complex of tris-1,10-phenanthroline or tris-2,2'-bipyridyl;
- (b) acidifying the reaction system to effect a detectable change in the spectral density thereof indicative of the presence of hexacyanoferrates in the aqueous liquid;
- and
- (c) observing the detectable change indicative of the presence of hexacyanoferrates.
1 more element
A method for determining the concentration of hexacyanoferrates in an aqueous liquid, the method comprising the steps of:
- (a) forming an alkaline reaction system comprising the aqueous liquid and a cobaltic complex of tris-1,10-phenanthroline or tris-2,2'-bipyridyl;
- (b) acidifying the reaction system to effect a change in the spectral density thereof in proportion to the concentration of hexacyanoferrates in the aqueous liquid;
- and
- (c) measuring the spectral density of the acidified reaction system to determine the concentration of hexacyanoferrates in the aqueous liquid.
1 more element
Dependencies are inferred from the claim text.