Patent ID: 9746451
Date: 2017-08-29
CPC Classifications: G01N

Claim:
1. A system of determining a concentration of free chlorine in an aqueous solution suspected of having at least one chloramine species, comprising: a measuring system that measures an absorbance response over time wherein the absorbance response results from reaction of the free chlorine and the at least one chloramine species with a single reagent over time after the single reagent is added to the solution, the single reagent being reactive with the free chlorine at a first kinetic rate and reactive with the at least one chloramine species at a second kinetic rate, the first kinetic rate being different from the second kinetic rate; and a processor system configured to determine the concentration of the free chlorine in the solution based on a determined rate of change of the absorbance response over time; wherein the first kinetic rate is faster than the second kinetic rate and the processor system is configured to determine the rate of change of the absorbance during a time period wherein substantially all of the free chlorine reacted with the reagent.