Patent ID: 8183051
Filing Date: 2012-05-22
Classification: G01N,Y10T

Abstract:
1. A kit for determining residual chlorine or chloramine amount in a sample wherein said kit comprises a means for containing an iodide indicator solution for preparation of a first indicator and wherein said iodide indicator solution includes an iodide compound and a buffer solution, and wherein concentration of iodide in said iodide indicator solution is in a range of 0.01M to 10 M and wherein said buffer solution has a pH of 2-4; a means for containing a polyvinyl alcohol solution for preparation of a second indicator and wherein said polyvinyl alcohol solution includes a source of polyvinyl alcohol and said buffer solution, and wherein concentration of polyvinyl alcohol in said polyvinyl alcohol solution is in a range of 2 wt.-% to 7.5 wt.-% and wherein said buffer solution has a pH of 2 to 4 so that the polyvinyl alcohol indicator solution is flowed; a means for mixing said first indicator and said second indicator with a sample, and wherein said mixing forms a dye and wherein a color intensity of said dye depends upon an amount of residual chlorine or chloramine present in said sample; a means for colorimetric analysis non-automatically or semi-automatically or automatically with plural different sample color intensities and wherein each of said different sample color intensities represents a mutually different residual chlorine or chloramine amount so that said residual chlorine or chloramine amount of said sample is determined by comparing an intensity of said dye with said plural different sample color intensities, and wherein said residual chlorine amount of said sample is within a range of 0.02 mg/L-30 mg/L; an instruction manual with instruction for using said kit; wherein said kit comprises an effective amount of said polyvinyl alcohol for preparation of an indicator to provide a color stability for a long duration wherein the long duration is more than 24 hours and wherein said effective amount is within 2 wt.-% to 7.5 wt.-%.