Test for glycol in water
AssigneeZenon Airport Environmental, Inc.
InventorsBarry R. Loescher, David M. Newman, Rodney D. Thomson
Life of this patent
Estimating the term…
Abstract
Disclosed is a method of determining the presence of glycol in an aqueous solution comprising providing a container containing a mixture of potassium dichromate, a catalyst comprised of mercuric sulfate and silver sulfate, the mixture provided in an acidic solution. To the container is added a controlled volume of aqueous solution containing glycol. The mixture is permitted a time sufficient to change color, the time not being in excess of 15 minutes. The color is compared to a set of color standards to determine the presence of glycol in said aqueous solution.
Claims16
A method of determining the amount of glycol in an aqueous solution consisting essentially of:
- (a) providing a container containing a mixture of potassium dichromate, a catalyst comprised of mercuric sulfate and silver sulfate and a non-complexing acid;
- (b) adding a controlled volume of an aqueous solution containing glycol to said container to provide a mix;
- (c) permitting said mix a time sufficient to change color, said time not being in excess of 15 minutes;
- and
- (d) comparing said color to a set of color standards to determine the presence of glycol in said aqueous solution.
A method of determining the presence of glycol in an aqueous solution comprising:
- (a) providing a container containing a test solution comprising:
- 0.0001 to 20 wt. % potassium dichromate;
- 0.001 to 3.2 wt. % mercuric sulfate;
- 0.001 to 6 wt. % silver sulfate, the balance sulfuric acid having a concentration in the range of 40 to 99 wt. %;
- (b) adding a controlled volume of aqueous solution containing glycol to said container to provide a mix having 0.25 to 10 parts test solution to one part aqueous solution containing glycol;
- (c) permitting said mix a time sufficient to change color, said time not being in excess of 10 minutes;
- and
- (d) comparing said color to a set of color standards to determine the presence of glycol in said aqueous solution.
A method of determining the presence of glycol in an aqueous solution comprising:
- (a) providing a container containing a test solution comprised of:
- 0.02 to 20 wt. % potassium dichromate;
- 0.001 to 2 wt. % mercuric sulfate;
- 0.001 to 3 wt. % silver sulfate, the balance sulfuric acid having a concentration in the range of 70 to 99 wt. %;
- (b) adding a controlled volume of aqueous solution containing glycol to said container to provide a mix having 0.25 to 5 parts test solution to one part aqueous solution containing glycol;
- (c) permitting said mix a time sufficient to change color, said time not being in excess of 5 minutes;
- and
- (d) comparing said color to a set of color standards to determine the presence of glycol in said aqueous solution.
A method of determining the presence of glycol in an aqueous solution in the range of about 30 to 150 ppm glycol comprising:
- (a) providing a container containing a test solution comprised of:
- 0,025 to 0.25 wt. % potassium dichromate;
- 0.001 to 2 wt. % mercuric sulfate;
- 0,001 to 3 wt. % silver sulfate, the balance sulfuric acid having a concentration of 40 to 99 wt. %;
- (b) adding a controlled volume of aqueous solution containing glycol to said container to provide a mix having 0.25 to 5 parts test solution to one part aqueous solution containing glycol;
- (c) permitting said mix a time sufficient to change color, said time not being in excess of 5 minutes;
- and
- (d) comparing said color to a set of color standards to determine the presence of glycol in said aqueous solution.
A method of determining the presence of glycol in an aqueous solution in the range of about 150 to 1500 ppm glycol comprising:
- (a) providing a container containing a test solution comprised of:
- 0.25 to 1 wt. % potassium dichromate;
- 0.001 to 5 wt. % mercuric sulfate;
- 0.001 to 6 wt. % silver sulfate, the balance sulfuric acid having a concentration in the range of 40 to 99 wt. %;
- (b) adding a controlled volume of aqueous solution containing glycol to said container to provide a mix having 0.25 to 5 parts test solution to one part aqueous solution containing glycol;
- (c) permitting said mix a time sufficient to change color, said time not being in excess of 5 minutes;
- and
- (d) comparing said color to a set of color standards to determine the presence of glycol in said aqueous solution.
Dependencies are inferred from the claim text.