Abstract: Measuring the concentration of an analyte in an aqueous solution by obtaining an aqueous solution containing an analyte, providing a cyanine indicator, placing the aqueous solution in fluid communication with the cyanine indicator, measuring a detectable property change of the cyanine indicator, and comparing the detectable property change of the cyanine indicator with a calibration curve of the detectable property change of samples containing known concentrations of the analyte. The concentration of the analyte is determined using the detectable property change that is proportional to the concentration of the analyte in the aqueous solution.

Abstract: The present invention concerns a method of measuring the concentration of an analyte in an aqueous solution that comprises the steps of: obtaining an aqueous solution containing an analyte, providing a cyanine indicator, placing the aqueous solution in fluid communication with the cyanine indicator, measuring a detectable property change of the cyanine indicator, and comparing the detectable property change of the cyanine indicator with a calibration curve of the detectable property change of samples containing known concentrations of the analyte to determine the concentration of the analyte, wherein the detectable property change is proportional to the concentration of the analyte in said aqueous solution.

Abstract: The present invention discloses a thin reagent containing film sensor for detecting and measuring free chlorine in water, where components of the film sensor are a polymeric substrate that contains reactive material, an organic polyhydroxy compound, a reagent that creates an associated polymeric matrix, and an indicator; and a method for making the same. The film sensor can be formed to fit a specific dimension or shape. The film sensor swells or dissolves when exposed to aqueous solutions so that said reagent is released so that it can react with free chlorine, or the film sensor swells when exposed to aqueous solutions so that the aqueous solution diffuses into the film sensor and reacts with said reagent contained within the swollen film sensor.

Abstract: Stabilized metachromatic dyes, especially at application concentrations, comprising metachromatic dyes dissolved in one or more non-aqueous solvents, as well as metachromatic dyes dissolved in pH stabilized aqueous solutions. Also, various combinations of treatments are disclosed for stabilizing metachromatic dyes.

Abstract: Stabilized metachromatic dyes, especially at application concentrations, comprising metachromatic dyes dissolved in one or more non-aqueous solvents, as well as metachromatic dyes dissolved in pH stabilized aqueous solutions. Also, various combinations of treatments are disclosed for stabilizing metachromatic dyes.

Abstract: Stabilized metachromatic dyes, especially at application concentrations, comprising metachromatic dyes dissolved in one or more non-aqueous solvents, as well as metachromatic dyes dissolved in pH stabilized aqueous solutions. Also, various combinations of treatments are disclosed for stabilizing metachromatic dyes.