Ultra low range free chlorine measurement
AssigneeHach Company
InventorsAmit Das, Darren Kent MacFarland, Angella Nicholle Greenawalt, Daniel Gustav Mieritz
Life of this patent
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Abstract
An embodiment provides a method for measuring free chlorine in a solution, including: preparing a thiocarbamate-based indicator; introducing the thiocarbamate-based indicator to a solution, wherein the solution contains an amount of free chlorine and the introducing causes a change in fluorescence of the solution; and measuring the amount of free chlorine in the solution by measuring a change in intensity of the fluorescence. Other aspects are described and claimed.
Claims18
A method for measuring free chlorine in a solution, comprising:
- preparing a thiocarbamate-based indicator;
- introducing the thiocarbamate-based indicator to a solution, wherein the solution contains an amount of free chlorine and the introducing causes a change in fluorescence of the solution, wherein the solution comprises a monochloramine interfering species;
- titrating the solution to a pre-determined pH;
- and
- measuring the amount of free chlorine in the solution by measuring a change in intensity of the fluorescence, wherein the method for measuring provides for an output of free chlorine based upon a fluorescence curve generated for a condition affecting the change in intensity of the fluorescence of the solution, wherein the generated fluorescent curve comprises a condition of the solution that affects absorption values, wherein the intensity of the fluorescence is correlated to a concentration of the free chlorine in the solution.
A measurement device for measuring free chlorine in a solution, comprising:
- a processor;
- and
- a memory storing instructions executable by the processor to:
- prepare a thiocarbamate-based indicator;
- introduce the thiocarbamate-based indicator to a solution, wherein the solution contains an amount of free chlorine and the introducing causes a change in fluorescence of the solution, wherein the solution comprises a monochloramine interfering species;
- titrate the solution to a pre-determined pH;
- and
- measure the amount of free chlorine in the solution by measuring a change in intensity of the fluorescence, wherein the measurement device provides for an output of free chlorine based upon a fluorescence curve generated for a condition affecting the change in intensity of the fluorescence of the solution, wherein the generated fluorescent curve comprises a condition of the solution that affects absorption values, wherein the intensity of the fluorescence is correlated to a concentration of the free chlorine in the solution.
A method for measuring free chlorine in a solution, comprising:
- preparing a thiocarbamate-based indicator, wherein the thiocarbamate-based indicator comprises a methylumbelliferone derivative comprising a coumarin based fluorophore;
- introducing the thiocarbamate-based indicator to a water sample, wherein the solution contains an amount of free chlorine and the introducing causes a change in fluorescence of the solution, wherein the solution comprises a monochloramine interfering species;
- titrating the solution to a pre-determined pH;
- and
- measuring the amount of free chlorine in the solution by measuring a change in intensity of the fluorescence, wherein the fluorescence intensity is correlated to a concentration of the free chlorine in the solution, wherein the method of measuring provides for an output of free chlorine based upon a fluorescence curve generated for a condition affecting the change in intensity of the fluorescence of the solution, wherein the generated fluorescent curve comprises a condition of the solution that affects absorption values, wherein the intensity of the fluorescence is correlated to a concentration of the free chlorine in the solution.
Dependencies are inferred from the claim text.