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US 12,748,090 B2Granted
Mitigation of free chlorine interference for ozone detection using an indigo-based indicator
AssigneeHach Company
InventorAmit Das
Life of this patent
Estimating the term…
Abstract
An embodiment provides a method for measuring ozone in a sample, including: introducing an indigo-based indicator to a sample, wherein the sample contains an amount of ozone and the introducing causes a change in fluorescence intensity of the solution; introducing an ammonium salt to the sample; and measuring the amount of ozone in the sample by measuring the change in intensity of the fluorescence.
Claims20
A method for measuring ozone in a sample, comprising:
- measuring a first intensity of fluorescence of a sample that contains an amount of ozone;
- introducing an indigo-based indicator and an ammonium salt at about 2.0 millimolar to the sample;
- measuring a second intensity of fluorescence of the sample containing ozone after the introduction of the indigo-based indicator and the ammonium salt;
- measuring a change in intensity of the fluorescence between the first and second fluorescence intensities;
- and
- measuring the amount of ozone in the sample based upon the measured change in intensity of the fluorescence.
3 more elements
A method for measuring ozone in a sample, comprising:
- measuring a first intensity of fluorescence of a sample that contains an amount of ozone;
- introducing an indigo-based indicator and an ammonium salt at about 2.0 millimolar to the sample;
- adjusting the sample to a pH value;
- measuring a second intensity of fluorescence of the sample containing ozone after the introduction of the indigo-based indicator and the ammonium salt;
- measuring a change in intensity of the fluorescence between the first and second fluorescence intensities;
- and
- measuring the amount of ozone in the sample based upon the measured change in intensity of the fluorescence.
4 more elements
A measurement device which measures ozone in a sample, comprising:
- an indigo-based indicator;
- at least one measurement chamber;
- a processor;
- and
- a memory storing instructions executable by the processor to:
- measure a first intensity of fluorescence of a sample that contains an amount of ozone;
- introduce the indigo-based indicator and an ammonium salt at about 2.0 millimolar to the sample;
- measure a second intensity of fluorescence of the sample containing ozone after the introduction of the indigo-based indicator and the ammonium salt;
- measure a change in intensity of the fluorescence between the first and second fluorescence intensities;
- and
- measure the amount of ozone in the sample based upon the measured change in intensity of the fluorescence.
8 more elements
Dependencies are inferred from the claim text.