Kinetic determination of peracid and/or peroxide concentrations
AssigneeEcolab USA Inc.
InventorPaul R. Kraus
Life of this patent
Estimating the term…
Abstract
A use composition monitor determines the concentration of peracid and/or peroxide in a use composition using a kinetic assay procedure. A sample mixture containing a sample of the use composition, a diluent and at least one reagent is prepared and analyzed using, for example, an optical detector. Response data obtained by the detector is indicative of the optical absorbance of the sample mixture as a function of time. A processor analyzes the response data to determine a corresponding best fit linear relationship. The initial absorbance of the sample mixture is indicative of the concentration of peracid in the use composition, while the slope of the best fit equation is indicative of the concentration of peroxide in the use composition.
Claims21
A method comprising:
- preparing a sample mixture including a reagent comprising an iodide compound, and a sample of a use composition having a concentration of peracid and a concentration of peroxide to be determined;
- collecting response data indicative of absorbance of the sample mixture as a function of time;
- and
- determining the concentration of the peracid and the concentration of the peroxide in the use composition based on the response data,
- wherein determining the concentration of the peracid and the concentration of the peroxide comprises:
- determining a best fit linear relationship between the data indicative of the absorbance of the sample mixture and time, the best fit linear relationship including a slope and a y-intercept;
- calculating the peracid concentration based on the y-intercept;
- and
- calculating the peroxide concentration based on the slope.
A system comprising:
- a sequential injection manifold that is configured to prepare a sample mixture that includes a reagent comprising an iodide compound, and a sample of a use composition having a concentration of peracid and a concentration of peroxide to be determined;
- a detector that is configured to obtain response data from the sample mixture indicative of an absorbance of the sample mixture as a function of time;
- and
- a processor that is configured to determine the concentration of the peracid and the concentration of the peroxide in the use composition based on the response data,
- wherein the processor is configured to determine the concentration of the peracid and the concentration of the peroxide by at least:
- determining a best fit linear relationship between the data indicative of the absorbance of the sample mixture and time, the best fit linear relationship including a slope and a y-intercept;
- calculating the peracid concentration based on the y-intercept;
- and
- calculating the peroxide concentration based on the slope.
Dependencies are inferred from the claim text.