Optical sensor for bromide ion

摘要

Methods and systems to determine a concentration of bromide ions in an aqueous sample are disclosed. The method involves the oxidation of bromide ions to bromine, followed by bromination of a colored or fluorescent reporter compound which may be detected by spectrophotometric means. The relative change in color or fluorescence upon bromine binding to the reporter compound may then be used to determine a quantitative concentration of bromide ions in the sample. The system utilizes a photocatalytic coating in a sample chamber, a source of reporter compound in fluid communication with the sample chamber, light sources that may activate the photocatalyst and excite the reporter compound, an optical detection unit capable of receiving a light signal from the second light source after it has passed through the sample chamber, and various pumps, valves or injection syringes that regulate the flow of sample and reporter compound into and out of the sample chamber.

主权项

1. A single chamber system for detection of bromide ions in an aqueous sample, said system comprising:
a sample chamber that defines fluid inlet for receiving the aqueous sample, a fluid outlet, and an inner surface, said sample chamber also containing an oxidizing agent for oxidizing bromide ions to form bromine; a reporter compound that is luminescent when illuminated by light within a given wavelength band, said reporter compound being of sufficient quantity so that, when mixed with the oxidized water sample in said sample chamber, said reporter compound reacts with bromine in said aqueous sample to produce a mixture of reacted compound that has reacted with said bromine and unreacted reporter compound; a reporter light source that illuminates the unreacted reporter compound with light that is within a given band of wavelength; an optical detection unit that detects a light emitted by the unreacted reporter compound; and a pump to control flow of the aqueous sample into the sample chamber and flow of the mixture of reacted compound and unreacted reporter compound out of the sample chamber.